X728

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X728 V2.2 Interface
X728 V2.1 Interface
X728 V2.1 Jumper Cap Function
X728 V2.1 packing list
X728 V2.0 Jumper cap function
X728 ups board-Interface
X728 V1.3 ups board-Jumper cap function
X728 ups board
X728 v1.2 ups board-Back
X728-A1 Packing List
X728-A2 Packing List
X728-C1 metal case for X728 V2.x/x735/x708
x728-c1 Accessories
X728 V1.3 PCB Layout
X728 V2.0 PCB Layout
X728 V2.1 PCB Layout


Update History

X728 V2.3

Released on 20th Aug. 2022;

No any functional changes; just change the SMD 18650 battery holder to a pin battery holder to improve the reliability of battery holer soldering.

X728 V2.2

Adds Battery Reverse Polarity Protection circuit & LED indiciators on v2.2

WARNING!!!

Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-". 

X728 V2.1

Released on 23th Sep. 2021;

Update:

  • New add a buzzer controled by GPIO20
  • DC jack is changed from DC5525 to DC5521.

X728 V2.0(sold out)

  • PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.0.
  • Improve the power path function, the battery will only charge and not discharge when connected to the PSU(power supply unit). [The PSU power will charge the battery and also pass through to the RPi when it has power. If the PSU loses power (power failure), the X728 will switch over to battery power.]
  • You can choose to charge when boot up by short "CHG EN" and stop charging at shutdown.
  • Increase battery overcharge, overdischarge protection circuit, added power input surge protection circuit.
  • Added power input connector, which can be used with X715 to achieve 6~60V wide voltage input.
  • PCB Size change: 87x63.7mm
  • Important:X728 V2.0 changes the direction of the battery polarity. When installing the battery, you must check and confirm the positive and negative poles.

X728 V1.3(sold out)

X728 V1.3 is released at Febuary 2021.

  • Remove the hardware ASD function and change it to software implementation
  • The charging power indicator (LED1-LED4) is relatively brighter than V1.2.

Overview

The X728 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header.

It provides 5.1V 6000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown,AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, and a real- time clock.

The X728 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X728 can also be used with the X825/X828/X829 (2.5" HDD/SSD Shield) and X857/X862/X872 (MSATA/M.2 SSD shield) for safe data backup.

Video Test Max 5.1V 6000mA Output: https://youtu.be/m_oIDrMEp0U

SAFETY INSTRUCTIONS AND WARNINGS

  • You must read these safety instructions and warnings before charging your batteries.
  • Lithium Polymer and Li-ion batteries are volatile. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly.
  • Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-".
  • Do not mix and use old batteries and new batteries, or batteries with different brand names.
  • Lithium batteries has it's cycle life, please replace old battery with new one when it reaches it's service life or when it is two year old, whichever comes first.
  • When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X728 on the wood material or carpet and unattended.
  • Must keep the X728 away from children.
  • Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/
  • Battery Recommend for X728 board, please refer to: File:NCR18650B.pdf

Features

FOR USE WITH

  • Raspberry Pi 1 Model B+/ 2 Model B / 3 Model B / 3 Model B+ / 3 Model A+ / 4 Model B

OPERATING SYSTEM

  • Raspbian Stretch
  • Safe shutdown function tested for Raspbian, other operating systems to be tested and advised

KEY FEATURES

X728 18650 UPS + Power management board

  • Smart and powerful Uninterruptible Power Supply (UPS)
  • Provides continuous operations for up to 10~30hours (depending on battery type and qty used)
  • Max 5.1V 6000mA Power Backup for even the most demanding RPi set ups
  • Can work with X728-A2 stackable 2-cell battery holder to increase battery capacity
  • Supports 3000mA fast battery charging
  • Integrated over current protection and over voltage protection
  • Integrated Maxim's fuel-gauge systems (Reading battery voltage and percentage via i2c)
  • Integrated 10-A fully-integrated synchronous boost converter
  • Intelligent automatic charging and discharging
  • On-board 4 green LEDs indicate battery charging and discharging levels of 25%, 50% , 75% and 100%


  • Intelligent and safe power management
  • Equipped with momentary button for easy power control
  • Press the button to turn on
  • Press the button and hold for 1~2seconds to reboot
  • Press the button and hold for 3~7seconds to implement safe shutdown
  • Press the button and hold for >8seconds to force shutdown
  • Supports safe shutdown and full poweroff through software
  • On-board blue LED shows the status of power on, reboot and shutdown
  • AC power loss or power adapter failure detection (LED and GPIO detection)
  • On-board pin header allows to select auto power-on when power supplied
  • Automatic safe shutdown when battery low (voltage <3.0V)
  • Ultra-low standby power consumption to maximize battery life
  • Operate in both charge mode and boost mode to allow full system management and battery power management
  • Integrated IN-to-SYS pass-through path to pass the input voltage to the system
  • Advanced system power-path management avoids batteries frequent charging and discharging
  • Advanced system power-path management allows 3A fast charging and powering Raspberry Pi at the same time


  • Integrated Hardware DS1307 Real Time Clock (RTC) with Battery Back-Up
  • Keeps track of the time while the Raspberry Pi is switched off
  • Allows the Raspberry Pi to retrieve the current date and time when it is switched back on
  • Uses the 18650 battery to maintain the date and time - no additional battery required


  • Powers the Raspberry Pi via the 40-pin header - no additional cabling required
  • On-board DC power jack (5.5*2.5mm) and Type-C socket convenient for power input
  • On-board PH2.0 connector allows to connect external power switch and DIY your perfect case
  • On-board XH2.54 power output connector allows to power other devices
  • Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards

SPECIFICATION

  • Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A
  • UPS output : 5.1V ±5% Max 6A
  • UPS charging current: 2.3~3.2A
  • Terminal Battery Voltage : 4.24V
  • Recharge Threshold : 4.1V

Note:

  • Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket.
  • Do not use 18650 battery with built-in protection circuit

PCB Size

  • X728 V2.0/V2.1/V2.2: 87x63.5mm
  • X728 V1.3: 85x63.5mm

How to Power

  • Power via DC5521 Jack of X728, 5.1Vdc +/-5% , ≥4A (DC5525 Jack is compatible with DC5521, also support 5V PSU with DC5525 Jack)
  • Power via USB Type-C port of X728, 5.1Vdc +/-5% , ≥3A (Geekworm Type-C 5V 4A 20W power supply is recommended.)

Packing List

  • X728 Expansion Board x 1
  • Screw M2.5 *5mm x 8
  • Spacer M/F M2.5 *20mm x 4
  • Spacer F/F M2.5 *20mm x 4
  • Jumper link Pitch 2.54mm x 3

X728-C1

X728-C1 is a metal case for X728 V2.2/V2.1/V2.0 or X708/X735.

Installation Video: https://youtu.be/QOG30LXb6ds

X728-A1

X728-A1 Optional Raspberry Pi cooling fan

  • Completely solve the overheating problem of your Raspberry Pi
  • Efficient drop temp of your Raspberry Pi by using the X728-A1
  • Stackable design allows you to connect both X728 and X728-A1 on your Raspberry Pi
  • On-board XH2.54 power output connectors allow to power other devices
  • Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards

X728-A2

X728-A2 Optional 18650 2-Cell battery holder

  • Stackable 18650 two cells lithium Ion holder
  • Ideal solution to increase battery capacity
  • Integrated battery protection circuit

User manual

X728 extended application

How to Connect Raspi and X728 X728 with X708-A1

FAQ

Q:Why Raspberry Pi is randomly rebooting all the time?

A:You can follow the steps to test if the X728 issue:

a:Take the X728 off from the Raspberry Pi, remove all the batteries, power supply, and all jumper caps. Then connect the battery or power supply, press the blue power button on X728, the blue LED should be on, and then press and hold the power button for more than 8 seconds, the blue LED should be off.(These steps indicate that the X728 has no issue.)

b:Please check and confirm if other device occupy the GPIO with X728.

c:Still not find out the issue, please attach a video to contact us show more details.


Q: Why the X728 V1.3 remove the ASD function?

A: Because the ASD jumper will generate some issues, so we remove the ASD jumper, but now you can achieve ASD function by software. Read the voltage through I2C, and then decide whether to shut down.


Q1: Why X728 V1.2 automatically shuts down?

A: 1. X728 V1.2 will automatic safe shutdown when battery voltage is low than 3.0V, please charge in time;

2. Please try the following operation by step:

  1. Remove all jumper cap,
  2. Remove all 18650 battery
  3. Place 18650 battery again and wait a few seconds before testing

3. What battery is recommended for X728?

A:Because there are so many kind of batteries, and the quality is also various. So we suggest to use the NCR18650B from Panasonic. Also do not use 18650 battery with built-in protection circuit for X728.



Q3: How to restart the pi board when AC Power supply is connected?

A: Please enable 'AUTO POWER ON' or 'AUTO ON' function if you want restart when the AC Power supply is reapplied.


Q4: About auto shutdown, found your board auto shutdown.

A: Please check if enable the ASD function (shorted the ASD header), if you enable the ASD function, please make sure your operation is right: first, place the battery into the battery holder, insert the jumper to ASD header after 3 seconds,this is very important!!


Q5:Is the recharge threshold and terminal battery voltage adjustable? I want to keep the batteries between 80% and 20%

A: Sorry, this is not support.


Q6: Which GPIO is used to power the X728-A1 cooling fan?

A: The X728-A1 does not occupy the GPIO, it use the PIN 2,4 to provide the power.


Q7: How can I remove all software created by the setup and start over?

A: 1) sudo /etc/rc.local , delete x728pwr.sh

2) sudo rm /etc/x728pwr.sh

3) sudo rm /usr/local/bin/x728softsd.sh


Q8: What are GPIO5 and GPIO12 used for X728 V1.3/V2.0?

A: GPIO5 control shutdown, GPIO12 BOOK OK.


Q9: Are the batteries on X728 hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?

A:Sorry, the batteries on X728 is not support hot-swappable. Please cut off the power to swap the batteries.


Q10: Does the rtc have a separate battery? or does it run on the 18650 batteries? what happens if you remove them? will it "lose" time?

A:No, the RTC function runs on the 18650 batteries. It will "lose" time if you remove the batteries.


Q11: What will lead to the X728 board be burnt out?

A: Please make sure the polarity of battery is "+" to "+" and "-" to "-" and match with the "+" "-" mark on battery holder. The battery protection chip IC will be over-current, heat and then burnt if one or two of the batteries are connected reversely. PS: the X728 board will not be burnt immediately if one or two of the batteries are connected reversely.


Q11: What frequency does X728 use in the I2C communication bus used to communicate with RPI?

A: It depends on the motherboard and OS, please refer to this topic as reference: https://forums.raspberrypi.com/viewtopic.php?p=312582

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Anonymous user #45

12 days ago
Score 0++

Can you share wire connection of switch to button? I want to connect another button with C-NC-NO. With the small blue button it works to restart with 3 seconds press. But I have tried all combinations with a button in switch and not works to shutdown and power on.

Thanks

Lisa

12 days ago
Score 0++
Hi,The x728 supports the connection of a 4pin momentary switch, but the safe shutdown function requires an installation script to be realized. Please refer to here for the switch:X728-hardware#Connector for External Power Switch

Anonymous user #46

12 days ago
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Hello Lisa. Your documentation is wrong. Is pin 1 and 3 with a single button. Thanks

Anonymous user #43

3 months ago
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Hello. I have been using multiple versions of v1.0v -> v1.3 -> v2.0 -> v2.2. I am currently using v2.2. Thanks for a great product.

I have ASD enabled. I have CHG enabled. In this state ...Power supply from AC ON -> Startup. This is OK. Power supply from AC is turned off → shutdown by detection in the script. This is also OK.

However... The next timing, "power supply ON from AC -> startup" does not go well. The red LED on the board lights up for a moment. It does not turn on automatically.

If I turn off the power supply again and then turn it on again, the automatic power ON works.

This did not occur in v2.0. Do you know what this problem is?

Translated with www.DeepL.com/Translator (free version)

Lisa

3 months ago
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Hello,

This should be related to discharging time of your power adapter. once removed the power supply from AC outlet, there is still voltage output but will reduce slowly. in this perid, the X728 can detect the voltage so it cannot turn on automatically. You can try 1) Remove the power supply and wait for a longer time (normally 10~15 seconds) then plug in again. 2) Change the script and adjust the time to be longer to shut down after AC power loss. the time is subject to dicharging time of your power supply.

Anonymous user #44

3 months ago
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Thank you for your prompt reply.

I understood the content. However, since we were considering and implementing an automatic startup and shutdown of the Raspberry Pi linked to the motorcycle key (main power), it is difficult to unplug the power supply. Therefore, I gave up on 1).

We believe that a set of 1) and 2) will be effective, but (2) alone. So, after detecting AC off, I waited 15 seconds before shutting down the system. After shutdown, I waited 30 seconds to turn AC on, but there was no improvement.

********* Key on -> auto startup -> key off -> shutdown. After that, I will try to operate it as key on -> key off immediately (like a reset process).

This didn't occur with the previous version.

Has something changed?

Lisa

3 months ago
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If the voltage there still present, then the X728 cannot implement auto-on. we can change the script or a resistor to match your applicaiton but will need to know the timing from 5V to 0V after key off. for this new verison, we changed the MCU and auto-on shoud be more reliable as long as the timing is confirmed.

Anonymous user #42

6 months ago
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Hello, Is it possible to stop the buzzer using a button (Hardware interruption)?If yes, How can it be achieved .

Thanks

Lisa

6 months ago
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Hello,

Yes, you can block buzzer in the script.

Anonymous user #42

6 months ago
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Hello, I want the buzzer to work when AC power fails, but buzzer should not go on indefinitely, I want to use a button to switch off the buzzer sound.

Which pins i can use to execute this functionality ?

Lisa

6 months ago
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Hi,

①Please refer X728-Software#FAQ--Raspberry Pi Tutorial: How to Use a Buzzer

②AC FALL(AC Power Loss LED)----When AC power supply is not connected or power supply fails, the red indicator light is always on. If connected to AC power, the red indicator will not light up.

Anonymous user #40

7 months ago
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by the way, is there a sequence we have to follow to unassmble the hat to avoid damagin itsel or the raspberry?

Anonymous user #40

7 months ago
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Finally got it working, are there any other commands that could be useful? is there a way to disable te buzzer?

Harry

7 months ago
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Hi, check the x728pld.py file, try to comment out the following python code: GPIO.output(BUZZER_PIN, 1) time.sleep(0.1) GPIO.output(BUZZER_PIN, 0)

time.sleep(0.1)

Anonymous user #41

7 months ago
Score 0++

Good day,

Can both input power supplies (USB Type-C and DC Jack) be used at the same time? What would happen if one (or both) of the input's voltage or current drops below the specification?

I believe in the event where both the first, and second power supply inputs requirements fail, the AC FAIL LED will light up and the board will now use it's 18650 batteries.

Is it safe for the board to receive an input below the requirements? e.g. solar panels outputting 0V at night, or below 5V and below 3A on a cloudy day. Would the board automatically recognize the failed requirements and switch to it's 18650 batteries safely without damage to the board?

If so, what would be the threshold values of low voltage and amperes to activate the switch to it's 18650 batteries?

Also, doing some testing, I connected the board's input to a power bank battery that outputs 5V, but it's 2A (1A below the required current). The board is booting up and charging correctly. At what current would the board stop recognizing the input as reliable and activate the AC FAIL LED?

Great product by the way, I would love to know the answers to these questions. Thank you.

- Miguel

Lisa

7 months ago
Score 0++

Hi,Miguel

①Please do not use USB Type-C and DC Jack power to X728 at the same time.

②When the input voltage is lower than about 4.2~4.5, gradually switch to battery power supply

Anonymous user #40

7 months ago
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Hi, both button top and flat top batteries woudl fit right?

Lisa

7 months ago
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Hi, The size of the button top batteries may be a bit large. you can use flat top batteries.

please refer to:X728-hardware#18650 battery dimension;Please buy the correct size battery.

Anonymous user #39

7 months ago
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Is it a specification that the UPS does not power down after the RPI shuts down successfully using the X728? Due to this phenomenon, RPI does not start even if power is supplied to the UPS after shutdown.

The AON pin is set to short.

Lisa

7 months ago
Score 0++

Hi,

Short the AON pin;

after shutting down, the Raspberry Pi will not restart automatically if the power supply is not replugged in or unplugged. But AON function detection is more sensitive, if it detects a voltage, it will automatically turn on.and we will improve this feature in the future.Thanks~

Anonymous user #38

8 months ago
Score 0++
On the underside of the X728 is a 5v in port (just under the barrel jack). Can this be used to supply power to the hat, or can I only use the barrel jack or USB C port?

Anonymous user #38

8 months ago
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OP here,

the reason I am asking is that I tried to supply power to this hat through the port from a LM2968 buck convertor but the converter belw up. If I can't supply power in to the 5v XH2.54 connector, I will have to wire it in to the barrel jack (or maybe using dupont connectors straight on to the GPIO pins??????)

Lisa

8 months ago
Score 0++

Hi,

Yes,you can use [5v IN XH2.54], but please note :DO NOT connect 5V to the BATT connector, this is very dangerous.

Anonymous user #37

9 months ago
Score 0++

Hello - I am running Raspberry Pi OS Bullseye (January 2022 release). I followed the documentation as well as I could understand it. I ran 'sudo raspi-config' and enabled the I2C interface, then rebooted the Raspberry Pi with the X728 v2.1 installed.


When I run dmesg, I see the following message displayed:

i2c i2c-1: new_device: Instantiated device ds1307 at 0x68 i2c i2c-1: Failed to register i2c client ds1307 at 0x68 (-16)

Is this something I should be concerned about?

Also - I cloned the GitHub repository and have both the x728bat.py and x728pld.py scripts in /home/pi, but I am having difficulty understanding what I am supposed to do with them. All I am interested in is having the RPi shut itself down if there is a power outage and the batteries are drained.

Lisa

9 months ago
Score 0++

Hello,

Did you find the address [0x68] of the RTC with the command [sudo i2cdetect -y 1] ?

Anonymous user #36

9 months ago
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Hello geekworm! I've been findin X728v2.1 an excellent product! Very usefull and great quality for the price.

I forgot to turn off RPi on standby mode and it drained my cells down to 2,97V. The Cell is Samsung INR18650-35E which has a 2.65V of cut-off voltage and therefore you rescued my cells! But when I plugged DC-Jack with 5,01V to X728 it draws only 0,15A current. So It's charging very slow or not at all. One of four battery diodes is blinking.

Anonymous user #36

9 months ago
Score 0++
Oh It's me again! Just got above 3V and the current is now higher! I understand that if the voltage is extremely low then it charges very slowly in order not to destroy the cells. When voltage is above 3V it charges normally. Am I right?

Lisa

9 months ago
Score 0++

Hello,

beacuse X728 has overcurrent protection and overvoltage protection

Automatic safe shutdown when battery low (voltage <3.0V)

Ultra-low standby power consumption to maximize battery life

Anonymous user #35

9 months ago
Score 0++
I just got my board today and put batteries in and USB c power and I can't get it to stop buzzing. Hold button to shutdown and restart and its still buzzes.

Lisa

9 months ago
Score 0++

Hello,

1/ X728 V2.1 add a buzzer controlled by CPIO 20; please plug in the power supply to the X728 without raspberry pi , and turn it on to check if it is still calling; if not, please check GPIO 20 is occupied.

Raspberry Pi Tutorial: How to Use a Buzzer: please refer to :X728-Software#FAQ

Anonymous user #35

9 months ago
Score 0++
I plug in power supply without anything plugged in. No pi or batteries. Blue light comes on. Press the power button and it beeps continuously. Add batteries, still beeps. What do I do with pin 20 to get it to stop beeping?

Anonymous user #35

9 months ago
Score 0++
Plug power in and it still buzzes. Installed the python scripts from github. They work fine and says AC power is connected. I even wrote my own python script to turn pin 20 to 0 and IT STILL IS BUZZING. Can I return this? Bought on amazon

Lisa

9 months ago
Score 0++

Hi,

could you please send us some test videos?and tell us your order number,please send to <support@geekworm.com>;thanks~

Anonymous user #35

9 months ago
Score 0++
I ripped off the buzzer. Couldn't take it anymore. Everything else works as it should for my testing purposes.

Anonymous user #34

10 months ago
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What's the power output of X728-A1's XH2.54 pins?

Lisa

10 months ago
Score 0++
Hello, It's 5V output, directly connected to the Raspberry Pi 40-pin header--pin 2,pin 4 ;output current is shared, and X728-A1 has no set limit.

Anonymous user #33

11 months ago
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Does the X728 stop charging the batteries once they reach 100% charge?

Lisa

11 months ago
Score 0++
Yes.

Anonymous user #32

11 months ago
Score 0++
I am designing my own daughter board that must work in conjunction with the X728 DC UPS. I need to use several GPIO pins, but want to make sure I don't cause a conflict between my the board I am designing and the X728 DC UPS. I know that you use I2C on pins 3 and 5, and I believe you also use GPIO5 and GPIO12. You use Pins 2,4 for power too. Are there any other GPIO pins used by the X728 DC UPS, or am I free to use all the rest of the GPIO port?

Lisa

11 months ago
Score 0++
Hi,please refer x728-hardware--(Pins and GPIO used);you can use pins that are not occupied by x728

Anonymous user #31

12 months ago
Score 0++
  • WARNING* This hardware is not yet supported by BULLSEYE released 10/30/21. python packages needed to drive the software are not available at this time. Do not upgrade to BULLSEYE until you are certain all python packages are updated.

Anonymous user #30

12 months ago
Score 0++

Hi, my AC fail led is blinking while my usbc is connected to the x782 V2.1. Any reason?

Also another x782 V2.1. is just continuously beeping while the batteries are connected. Why is that?

Lisa

12 months ago
Score 0++

Hi,1/for the BEEPING: X728 V2.1 add a buzzer controlled by CPIO 20; please plug in the power supply to the X728 without raspberry pi , and turn it on to check if it is still calling; if not, please check GPIO 20 is occupied.

2/[AC fail led is blinking]: We need to troubleshoot whether it is a line problem. Could you send us a video to check it? <support@geekworm.com> and please tell us your order NO.

Anonymous user #29

15 months ago
Score 0++
According to the "X728-hardware" on the wiki, pins 2, 3, 4, 5, 6, 29, 31, 32 and 33 are used by the X728. Are the remaining Pi pins available for us to use and does the connector on the X728 pass those through?

Lisa

14 months ago
Score 0++
Hi,Yes, you can use unoccupied Pins and GPIO

Anonymous user #16

15 months ago
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the mosfet blew so I replaced it but it only outputs 3.7v now. What could have caused this? i see no other damage on the board.

Lisa

15 months ago
Score 0++
Hi,If the voltage across the capacitor is also 3.7V, then it is very likely that the chip is burned out(next to the upper right corner of the ups [2R2] ). Please check it.

Anonymous user #28

16 months ago
Score 0++
Is the DC Barrel positive tip or negative tip?

Lisa

16 months ago
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Hi,DC Barrel positive tip(the tip inside the DC port is positive.)

Anonymous user #27

16 months ago
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I'm currently using an unprotected battery. Can you tell me why I shouldn't use a protected battery?

I think it's safer.

Lisa

16 months ago
Score 0++
Hello,Because the x728 battery holder has a built-in protection circuit.

Anonymous user #27

16 months ago
Score 0++
Thank you. I understand.

Anonymous user #27

16 months ago
Score 0++
Where can I get the switch with the four wires connected in the image?

Lisa

16 months ago
Score 0++
Hello,You can find it here: https://geekworm.com/

Anonymous user #27

16 months ago
Score 0++
Thanks, I wanted this for my X728.

Anonymous user #26

17 months ago
Score 0++
Does A2 battery holder shows power remaining?

Lisa

17 months ago
Score 0++
Hello,There is no LED light on the X728-A2 battery holder; The green indicator of x728 will show the battery status.

Anonymous user #26

17 months ago
Score 0++
I got X728 and X728-A2 (battery holder). I have Pi 4B. I can't figure it out on assembly. There were no instructions on assembly and not even steps to connect jumper. What the heck? How can I assemble this?

Anonymous user #26

17 months ago
Score 0++
My bad. I found the manual.

Anonymous user #25

17 months ago
Score 0++

Hello, Can I use gpio6 directly in gpio13 to shut it down immediately in case of AC failure? using the script x728pwr.sh ?? I have a x728 v1.3

greetings

Lisa

17 months ago
Score 0++
Hello,We do not recommend this,and we have not tested like that. Please refer the software of X728 V1.3;regards

Anonymous user #24

18 months ago
Score 0++
How to enable 'AUTO POWER ON' or 'AUTO ON' function?

Lisa

17 months ago
Score 0++
Hi,please refer here:https://wiki...E6%98%8E.jpg

Anonymous user #23

18 months ago
Score 0++
Is there a maximum number of A2 battery packs that can be chained together?

Lisa

17 months ago
Score 0++
Hello,no limit. If you want to use more batteries, we recommend X708-A1, which supports 18650 batteries/8pcs ;please refer here:https://wiki...08-A1-05.jpg

Anonymous user #21

18 months ago
Score 0++

Assuming everything is installed correctly:

When i call x728off nothing happens...

maintenance@solarstream:~ $ x728off X728 Shutting down... maintenance@solarstream:~ $

if i bash directly the script x728softsd.sh i get:

maintenance@solarstream:~ $ bash /usr/local/bin/x728softsd.sh /usr/local/bin/x728softsd.sh: line 6: /sys/class/gpio/gpio13/direction: Permission denied /usr/local/bin/x728softsd.sh: line 7: /sys/class/gpio/gpio13/value: Permission denied X728 Shutting down... /usr/local/bin/x728softsd.sh: line 20: echo: write error: Operation not permitted

and if i call the script one more time:

maintenance@solarstream:~ $ bash /usr/local/bin/x728softsd.sh /usr/local/bin/x728softsd.sh: line 5: echo: write error: Device or resource busy X728 Shutting down...

maintenance@solarstream:~ $

Anonymous user #20

19 months ago
Score 0++
OK, friends. I guess I found a workaround. My X728 had a problem with turning off 3 seconds after power up, and the problem still existed after I completely reset my Raspberry Pi 4. However, when I connected my X728 to 'another Raspberry Pi', it worked, and again confirmed that it works on the original Raspberry Pi as well. I didn't understand this logic at all, but anyway, I'm glad to find it works again. There's still a lot to say about the company not supporting customers....

Anonymous user #22

18 months ago
Score 0++
Thank you! You save my time!

Anonymous user #18

20 months ago
Score 0++
x728 ver 1.3 does not shutdown when battery voltage is 3.0V. How to get safe shutdown when battery voltage drops bellow threshold?

Anonymous user #21

18 months ago
Score 0++
same problem here, this UPS is very buggy, i consider returning to the seller...

Cindy

18 months ago
Score 0++

Hi friend,

Sorry for the delay reply, for the X728 V1.3 version, ASD function by hardware has been removed, it need to control by software to implement the fucntion.

Anonymous user #17

21 months ago
Score 0++

I have an issue with the RTC clock and can’t find a solution. I tried to install a brand new OS from the official Raspbian Buster Lite, and did a clean install of the x728.sh script from github. The error code at startup of raspberry is:

[ 22.027235] rc.local[621]: hwckock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Invalid argument [FAILED] Failed to start /etc/rc.local Compatibility See ‘systemctl status rc-local.service’ for details.

I think the problem goes around “hwclock”. Even if I try to “hwclock -r” the result is: hwckock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Invalid argument

How can i solve it?

Anonymous user #16

21 months ago
Score 1++

For anyone wondering. setting GPIO 13 as out and high will turn off the x728.

Would be really helpful to have that listed here as not everyone can install the soft as lifted in this wiki. I am using it on a pi running android.

Anonymous user #14

22 months ago
Score 0++

I installed and used an x728 hat on an RPi4 a few months ago, and it worked great. Unfortunately, I had to do a complete reinstall of the operating system on that Pi, and when I went to reinstall the x728... I can't get it to work. When I try to boot it up (by applying power from the power brick via the usb-c port on the x728), I can see the red and green lights on the RPi start to flash as they would during startup, but then it simply shuts down after about three seconds. This happens every time. In an effort to troubleshoot, I tried:

- disconnecting the x728 hat

- deleting the /etc/x728pwr.sh and /usr/local/bin/x728softsd.sh

- reconnecting the x728 hat (without batteries)

- booting up RPi and running sudo bash x728.sh

- shutting down RPi, moving power source to x728 hat, and installing batteries

- turning on power to x728

The result is always the same... I can see the red and green lights on the RPi flash for about three seconds and then it just shuts off. If I remove the batteries from the x728, and move the power source back to the RPi (usb-c connector) and apply power, the RPi boots up just fine.

It simply won't boot up if power is coming from / or via the x728 hat. Any ideas?

Anonymous user #15

21 months ago
Score 0++
had the same problem, the Raspberry starts briefly and switches off again. After trying for a long time, it worked again using the following procedure. 1. Disconnect the X728 from the Raspberry and remove the batteries 2. Put the X728 back on the Raspberry 3. Insert the batteries (Raspberry must not start, it did it for me every now and then, then start all over again) 3. USB-C charger on connect the X728 4. Switch on X728. Since then everything has been working normally again. Hope it helps with you too.

Anonymous user #14

21 months ago
Score 0++
Tired your suggestion, but no success. I even drained both batteries completely and the tried again. Oddly, that worked at first, but once the batteries got charged up to a certain point, the x728 shut down the RPi. I have no idea what's going on, but no one from Geekworm is responding on their dedicated forum. I'm not inclined to purchase any more of their products.

Anonymous user #19

20 months ago
Score 0++
Same here. Excluding X728, my RPi4 works perfectly. However, if I re-install it, the power is automatically cut off after 3 seconds. I'm not sure if they can really give us an answer. But we must remember. It's Made in China.

Lisa

17 months ago
Score 0++

Hello, Sorry for the late reply. for the automatically shuts down: 1/Remove all jumper cap, 2/Remove all 18650 battery 3/Place 18650 battery again and wait a few seconds before testing. 4/Please check and confirm if other device occupy the GPIO with X728.

I noticed your steps, please do not supply power through the USB-C port of the RPi.

If your x728 is V1.2 version; Please check if enable the ASD function (shorted the ASD header), if you enable the ASD function, please make sure your operation is right: first, place the battery into the battery holder, insert the jumper to ASD header after 3 seconds,this is very important!!

Still not find out the issue, please attach a video to contact us show more details.

Anonymous user #13

22 months ago
Score 0++

Hello,

on my x728 the RTC clock works, but does not continue to run when it is switched off. The Raspberry 4 has the time from the last shutdown after switching on. The fake hwclock has been uninstalled. Already had another x728 and there was no problem. Can someone help?

Anonymous user #12

22 months ago
Score 0++
Im experiencing an issue with starting up this UPS.I have tried charging my batteries with an efest battery pack charger and in the hat itself but when i try to power on the board it shuts down within 3 seconds. I have followed the troubleshooting tips above but i have yet to fin a problem. The Power light turns on and the 5v power led does as well, but then they both shut off. Id like to assume my board isnt broken and my batteries work, so is there a schema or effective way to test points with a multimeter so i can use this properly. I used it for a while in perfect condition but now it isnt working. The batteries indicate full charge on my charger and on the board. Please help

Lisa

17 months ago
Score 0++

Hello, Sorry for the late reply. please follow the steps to test if the X728 issue: a:Take the X728 off from the Raspberry Pi, remove all the batteries, power supply, and all jumper caps. Then connect the battery or power supply, press the blue power button on X728, the blue LED should be on, and then press and hold the power button for more than 8 seconds, the blue LED should be off.(These steps indicate that the X728 has no issue.)

b:Please check and confirm if other device occupy the GPIO with X728.

If there is no problem with the above test,please test it like this: 1/Remove all jumper cap, 2/Remove all 18650 battery 3/Place 18650 battery again and wait a few seconds before testing.

If your x728 is V1.2 version; Please check if enable the ASD function (shorted the ASD header), if you enable the ASD function, please make sure your operation is right: first, place the battery into the battery holder, insert the jumper to ASD header after 3 seconds,this is very important!!

Still not find out the issue, please attach a video to contact us show more details.

Anonymous user #11

23 months ago
Score 0++

Hi there,

the x728 works fine. The command "x728off" works wonderfully via the lxterminal, but I would like to use this command in a Python script so that I don't have to press the power button for 8 seconds after shutting down. Have already tried the subprocess module but without success. Does somebody has any idea? Thanks...

Anonymous user #15

21 months ago
Score 1++

I found a solution for everyone who wants to shut down the Raspberry Pi and the X728 via a Python script. - import subprocess - subprocess.call(["sudo", "/usr/local/bin/x728softsd.sh"])

so it should work.

Anonymous user #10

23 months ago
Score 0++
Mine seems to be defective, it's outputting 13.4v and the 5v out led flashes regardless of the condition. it seems to charge ok. I was planning on using this in an embedded application with an rpi 4b but I now have concerns about reliability. Anything to try?

Anonymous user #10

23 months ago
Score 0++
Never mind, one of the TPS61088 Synchronous Boost Converters had a cold solder joint. I was able to flex the board and make the problem come and go. When I reflowed solder to and around the converter the problems went away. Unfortunately due to the quality of construction I will not be able to use it for my intended purpose. Bummer!

Xiali

23 months ago
Score 0++
It should be caused by the HDMI input resolution higher than 1080p25fps (the resolution supported by the Raspberry Pi is 1080p25fps),By the way ,There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

Anonymous user #9

25 months ago
Score 0++
How can we configure the X728 with NUT? Using this unit with Home Assistance server and would like it to be able to communicate the Battery Status. NUT is the Linux UPS Manager, and Home Assistance has support for that.

Xiali

24 months ago
Score 0++
Hi dear,for the NUT & X728, As it is a DIY project, we dont know the details, please refer to x728-Software to read the voltage and power

Anonymous user #8

25 months ago
Score 0++
Hi, what is the operating temperature and humidity range for this ? Thanks

Xiali

24 months ago
Score 0++

Hi dear ,The general environmental operation is no problem, the specific temperature range cannot be informed because the high and low temperature reliability test is not done. You can read the battery voltage and power through I2C

There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

Anonymous user #6

26 months ago
Score 0++

Hello, your x728 board is excellent!

I was just wondering though how can I get servos to move position when I shutdown when I press the power switch?

AndreK

26 months ago
Score 0++
After charging, the battery capacity measurement is no longer correct and only slowly recovers when the Raspberry Pi has been running for a while? Furthermore, the volt measurement shows 3.6 V but the capacity measurement already shows only 5 percent. What could that be?

Anonymous user #7

26 months ago
Score 0++
I also had this issue, have you found an answer?

Xiali

24 months ago
Score 0++

Hi dear ,The battery chip need a continuous learning process during reading the battery capacity, we suggest that the battery should be fully charged at first, and then put off the electricity fully. Repeat like that after many times, the battery capacity will be gradually accurate. Note: When you trying, DON'T remove the battery plug , If you do, you need to retry again.

By the way ,There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

Anonymous user #5

26 months ago
Score 0++
Although this device "supports 3A fast charging", how can you configure it to not fast charge? I want to use a battery but it has a max-charge-current of 2.6A.

Anonymous user #5

26 months ago
Score 0++

How much current (max) does the ups draw for charging?

While plugged in, can the device still output over 3amps if the supply is only 3amps?

Anonymous user #4

27 months ago
Score 0++
Is there a case of the just size?

Cindy

27 months ago
Score 0++
Hello sir,Sorry, do design case but you caan use the HAT size acrylic case or N300 for X728, please refer to https://geekworm.com/.

Natalka1122

29 months ago
Score 0++

Is it compatible with X835? https://rasp...iki.com/X835

If so, how it should be powered?

Cindy

28 months ago
Score 0++

Hi friend,

Sorry, X728 is not compatible with X835, as the X835 requires 12V power supply.

Anonymous user #3

29 months ago
Score 0++

Why does the Raspberry Pi turn on and off repeatedly? The power turns on and turns off after 3 seconds, and turns on again. Is it because the battery is not fully charged?

X750 had the same error...

JesseArmand

29 months ago
Score 0++

I'm running https://raspap.com/ to use the Pi as a wireless hotspot. There was an issue with bringing up the wireless interface on RaspberryPi 3B+, if I short the jumper pin for ASD (Auto Shutdown). If I don't short the jumper, it becomes normal.

Has anyone else encountered the same issue?

Anonymous user #2

31 months ago
Score 0++

Cindy,

When do you expect the X728-A1 and X728-A2 boards to be available?

Is there a X728 Case in the pipeline?

Cindy

31 months ago
Score 0++

Hi friend,

The X728-A1 and X728-A2 will release later in May.

Anonymous user #1

31 months ago
Score 0++
When will this item be released?

Cindy

31 months ago
Score 0++

Hi friend, The X728 has just been releasded today, please refer to: https://geek...gement-board Best regards,

Cindy/Geekworm