After a battery failure I had to replace the battery in X728.
But now the red led and three of the four green battery status leds are blinking.
This does not happen without PI, but my PI is unchanged ..
PI is starting up normally, but the shutdown hook "xSoft.sh" also does not shutdown the PI, but reboots. Is the GPIO circuit damaged somehow ?
Hello, apologies for the dumb question: my external power button correctly turns the board on, and "x728off" works, but the external power button stopped working to turn the board off recently. I think I may have accidentally deleted a script or service. However, I cannot figure it out. I am using V1.3. I tried following your software tutorial, but it only seems to make "x728off" work.
If you can tell me how the 4-pin external power button works, I can write a script to make it work for me again. I'm not sure which pin it should look for to send the "x728off" command.
OK, sorry, I figured it out. I was trying to follow the schematic from the 4-pin LED momentary push button, but everything works as expected if you follow what the Wiki suggests.
The LED button has four pins: S1, S2, LED+, LED-
The x728 has four pins: PWR, GND, GND, LED+
Connect them as such:
PWR - S1
GND - S2
GND - LED-
LED+ - LED+
I don't know why my incorrect wiring ever worked, but this is what it always should have been. Leaving this here in case anyone else has the same problem!
Hi,It is normal. The algorithm for reading the power is very complicated. You can try draining the battery, then fully charging it, and then try reading the battery level again.
Hi. I have the 2.1 version without the "Battery Reverse Polarity Protection circuit".. and I really wish I did because I did a oopsie. I realized the issue a second later when smoke started to plume. I thought the device was dead, but interestingly enough, it does seem to work still when I put them in correctly - so question is, is it dangerous to use the device now when "something" have burned or did it not "burn enough" to break the board?
Please provide the STP file / CAD / measurement diagram so we can build a rear plate that accommodates both the PI4/5 and the UPS power connector. I do realize you already have your own case. Ours is completely different so we need the measurements. Thank you!
Hello, we can't provide this, and we also need to remind you that X728 can't be used on Raspberry Pi 5, about UPS for Raspberry Pi 5 please refer to: X1200X1201X1202
we looking for solution to softshutdown RPI4B when power fails and boot again when power restores in factory - over 100pcs. Can x728 achieve this function? Purchased one x728v2.5 for tests - installed exactly as instructed here but it behaves strange. Shoulddown action is ok, but when power restores it does no boot. If power removed and restored once again - RPI starts as expeted. Does anybody know what is that? Any cjances to resolve this? AUTO_ON jumper installed. Shutdown is done by running x728-v2.x-plsd.py script. Power supply 5V 7.0A. During test power removed from DC jack or USB-C.
We just did a simple test, by unplugging or plugging in the USB-C port, the X728 V2.5 is able to restore the power , it is not clear what the exact cause of your situation, you can contact our technical support at support@geekworm.com ,If possible, you can provide a video of your operation, so that we can more clearly understand the causes of the problem.(By the way, provide your order number)
Hi, currently, the Raspberry Pi 5 related products are under design, please wait for the update of our next products (we haven't tested X728 on Raspberry Pi 5)
Hello, X715 can be used with X728, of course, you still need to install the X715 software, the two together, will not interfere with their respective functions
It would be a perfect UPS if there was some sort of thermal monitoring present (mainly for safety: stop charging and low and high temp). Please consider adding temperature sensors for batteries in your next board revision.
I too would appreciate a 10-30 vdc input on the 5521 jack. It's easy to provide that range and let the x728 drop it to 5.1 +/-5%. It's much harder to build up an external 5.1 v 4 amp ps. I'd happily pay extra for that feature.
For X708 model there is the Key Features (wiki-geekworm-com/X708#Features) saying that it "supports 3.7V 18650 lithium battery and 3.7V lithium polymer battery. No capacity limit, only request 3.7V lithium battery".
However, on this wiki I couldn't find such information for X728 regarding the kind of batteries supported and the voltage. I just found the recommendation for Panasonic NCR18650B batteries which have 3.6v.
I discovered that LiFePO4 batteries are safer, they just can't burn. Which for me is something crucial if you want to leave RPi unattended. The only thing is that for 18650 LiFePO4 batteries, the more powerful I found was 3.2V and 1800mAh, and also the battery specs (copied bellow) say "Charge mode: CC/CV, use special Lithium LFP charger".
So, I would love to know if this LiFePO4 18650 battery model will still work in X728 UPS.
The setup would be 4 x 18650 LiFePO4 3.2V 1800mAh, as I already have X728-C1 with space for 2 more batteries.
The battery specs are:
Nominal voltage: 3.2V
Nominal capacity (0.2C, 25ºC, current value of 1800mAh at 1C): 1800±2mAh
Minimum capacity (0.2C, 25ºC): 1750mAh
Discharge - Normal current: ≤0.9A
Discharge - Fast discharge current: 1.8A
Discharge - Max continuous current: 5.4A (@ 5min)
Discharge - Max peak current: 10A (@ 5sec)
Discharge - Cut-off voltage: 2.5±0.2V
Charge - Charge voltage: 3.65±0.05V
Charge - Charge current: ≤ 1.8A
Charge - Cut-off current: 0.01C
Charge - Charge mode: CC/CV, use special Lithium LFP charger
Hello, in the FAQ on the X728 WIKI page, it is written that we suggest to use the NCR18650B from Panasonic. We have read the battery specifications of 18650 LiFePO4 batteries, and it should be usable. If this LiFePO4 batteries are safer, it is ok It is used, but it needs to be noted that when using batteries and power supply, be careful
Hello, it is possible in theory, I suggest you take a look at our SAFETY INSTRUCTIONS AND WARNINGS on X728, there are suggestions about using batteries, precautions, and battery recommendations for X728 boards
How can I deactivate the buzzer? I use a Homematic radio adapter (). Each time there is a service or error message, the buzzer beeps. I really need to deactivate the buzzer. Please advise!
As others have mentioned, I was finding that the provided scripts were immediately shutting down the x728 but were not doing a safe shutdown of the raspberry pi. The power was immediately being cut to the raspberry pi resulting in a crash.
See the last command for an example
pi@raspberrypi:~ $ last
...
reboot system boot 5.15.76-v7l+ Wed Dec 31 18:00 - 10:22 (19348+16:22)
pi pts/0 192.168.68.70 Thu Dec 22 09:48 - crash (-19348+15:48)
pi tty7 :0 Thu Dec 22 09:47 - crash (-19348+15:47)
pi tty1 Thu Dec 22 09:47 - crash (-19348+15:47)
...
I created a new script to do a safe shutdown and while I was at it, I added functionality and made the script configurable so you can choose the behavior you want for a given system. I also added a testing mode that provides more output, doesn't do a shutdown and cleanly exits the GPIO settings for the next test run.
I have created a bin directory in the pi home for testing. The script can be setup in the root crontab as follows, which will create a log file in /home/pi/log.
12/24/2022, 21:38:02 : System Startup
12/24/2022, 21:38:02 : AC Power GOOD
12/24/2022, 21:38:02 : Battery Capacity Good (96.23%)
12/24/2022, 21:38:02 : Battery Voltage Good (4.22V)
12/25/2022, 09:26:47 : AC Power Lost - Shutdown in 15 minutes
12/25/2022, 09:28:47 : AC Power Restored - Shutdown cancelled
12/25/2022, 09:56:09 : AC Power Lost - Shutdown in 15 minutes
12/25/2022, 10:11:00 : Shutdown in progress due to AC power loss
12/25/2022, 10:16:25 : System Startup
12/25/2022, 10:16:25 : AC Power GOOD
12/25/2022, 10:16:25 : Battery Capacity Good (98.77%)
12/25/2022, 10:16:25 : Battery Voltage Good (4.22V)
As you can see, if power is restored prior to the automatic shutdown, it will return to it's normal state. This is to prevent unneeded shutdowns in the event the power is cycling as it is being restored from the grid.
Here is the last command showing good shutdowns with this script.
pi@raspberrypi:~ $ last
...
reboot system boot 5.15.76-v7l+ Wed Dec 31 18:00 - 21:36 (19351+03:36)
pi pts/0 192.168.68.70 Sat Dec 24 21:08 - 21:11 (00:03)
pi tty7 :0 Sat Dec 24 21:07 - 21:11 (00:04)
pi tty1 Sat Dec 24 21:07 - down (00:04)
...
I recommend using testing mode from the command line and then once you have all the configurations the way you want them, turn off testing mode and schedule in crontab. Remember, testing mode will provide mush more output but will not trigger a shutdown.
Here is the script. Please use it at your own risk. You will want to set the configurations appropriate for your raspberry pi purpose. I am using all three triggers because I want a clean shutdown after 15 minutes or if there is an issue with the batteries so I'm triggering well before the batteries are drained. I hope some find this helpful.
pi@raspberrypi:~/bin $ cat auto_shutdown.py
!/usr/bin/env python
import RPi.GPIO as GPIO
import time
import os
import datetime
import struct
import smbus
import sys
Start Config
SHUTDOWN_TRIGGER = "All" # (AC Power,Capacity,Voltage,All) - determines what settings will trigger a shutdown.
AC_LOSS_WAIT_MINUTES = 15 # Number of minutes after power loss before shutdown is issued
CAPACITY_THRESHOLD = 50 # Shutdown will occur when capacity drops below the stated percentage
CAPACITY_STATUS_LOW = 20 # Low capacity warning below this level
VOLTAGE_THRESHOLD = 3.70 # Shutdown will occur when voltage drops below the stated percentage
VOLTAGE_STATUS_LOW = 3.50 # Low voltage warning below this level
TEST_MODE = "N" # (Y,N) - Will show extra output and will not perform shutdown when TEST_MODE = "Y", normal operation TEST_MODE = "N"
BUZZER_ON = "N" # (Y,N) - BUZZER_ON = "Y" and buzzer will beep when power is initially lost and right before shutdown
BUZZER_SECONDS = 0.5 # Number of seconds the buzzer will sound
if ( SHUTDOWN_TRIGGER == "AC Power" or SHUTDOWN_TRIGGER == "All" ):
if ( AC_STATUS == "GOOD" ):
if ( POWER_LOST_SEC > 0 ):
print(date_time + " : AC Power Restored - Shutdown cancelled")
POWER_LOST_SEC = 0
else:
if ( TEST_MODE == "Y" ):
print(date_time + " : AC Power " + AC_STATUS)
elif ( AC_STATUS == "LOST" ):
if ( TEST_MODE == "Y" ):
print(date_time + " : AC Power " + AC_STATUS)
POWER_LOST_SEC += 1
if ( POWER_LOST_SEC == 1 ):
print(date_time + " : AC Power Lost - Shutdown in " + str(AC_LOSS_WAIT_MINUTES) + " minutes")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( POWER_LOST_SEC >= WAIT_SECONDS ):
print(date_time + " : Shutdown in progress due to AC power loss")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( TEST_MODE != "Y" ):
safeShutdown(GPIO_PORT)
else:
print(date_time + " : Started in Test Mode, No actual shutdown will occur, program will exit.")
break
if ( SHUTDOWN_TRIGGER == "Capacity" or SHUTDOWN_TRIGGER == "All" ):
if ( CAPACITY > CAPACITY_THRESHOLD ):
if ( TEST_MODE == "Y" ):
print(date_time + " : Battery Capacity " + CAPACITY_STATUS + " (" + str(round(CAPACITY,2)) + "%)" )
elif ( CAPACITY <= CAPACITY_THRESHOLD ):
print(date_time + " : Battery Capacity " + CAPACITY_STATUS + " (" + str(round(CAPACITY,2)) + "%)" )
print(date_time + " : Shutdown in progress due to battery Capacity below " + str(CAPACITY_THRESHOLD) + "% threshold")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( TEST_MODE != "Y" ):
safeShutdown(GPIO_PORT)
else:
print(date_time + " : Started in Test Mode, No actual shutdown will occur, program will exit.")
break
if ( SHUTDOWN_TRIGGER == "Voltage" or SHUTDOWN_TRIGGER == "All" ):
if ( VOLTAGE > VOLTAGE_THRESHOLD ):
if ( TEST_MODE == "Y" ):
print(date_time + " : Battery Voltage " + VOLTAGE_STATUS + " (" + str(round(VOLTAGE,2)) + "V)" )
elif ( VOLTAGE <= VOLTAGE_THRESHOLD ):
print(date_time + " : Battery Voltage " + VOLTAGE_STATUS + " (" + str(round(VOLTAGE,2)) + "V)" )
print(date_time + " : Shutdown in progress due to battery Voltage below " + str(VOLTAGE_THRESHOLD) + "V threshold")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( TEST_MODE != "Y" ):
safeShutdown(GPIO_PORT)
else:
print(date_time + " : Started in Test Mode, No actual shutdown will occur, program will exit.")
break
Sorry, the code did not paste nicely when copied directly from Linux. I'll try again with a copy from windows.
!/usr/bin/env python
import RPi.GPIO as GPIO
import time
import os
import datetime
import struct
import smbus
import sys
Start Config
SHUTDOWN_TRIGGER = "All" # (AC Power,Capacity,Voltage,All) - determines what settings will trigger a shutdown.
AC_LOSS_WAIT_MINUTES = 15 # Number of minutes after power loss before shutdown is issued
CAPACITY_THRESHOLD = 50 # Shutdown will occur when capacity drops below the stated percentage
CAPACITY_STATUS_LOW = 20 # Low capacity warning below this level
VOLTAGE_THRESHOLD = 3.70 # Shutdown will occur when voltage drops below the stated percentage
VOLTAGE_STATUS_LOW = 3.50 # Low valtage warning below this level
TEST_MODE = "N" # (Y,N) - Will show extra output and will not perform shutdown when TEST_MODE = "Y", normal opperation TEST_MODE = "N"
BUZZER_ON = "N" # (Y,N) - BUZZER_ON = "Y" and buzzer will beep when power is initially lost and right before shutdown
BUZZER_SECONDS = 0.5 # Number of seconds the buzzer will sound
if ( SHUTDOWN_TRIGGER == "AC Power" or SHUTDOWN_TRIGGER == "All" ):
if ( AC_STATUS == "GOOD" ):
if ( POWER_LOST_SEC > 0 ):
print(date_time + " : AC Power Restored - Shutdown cancelled")
POWER_LOST_SEC = 0
else:
if ( TEST_MODE == "Y" ):
print(date_time + " : AC Power " + AC_STATUS)
elif ( AC_STATUS == "LOST" ):
if ( TEST_MODE == "Y" ):
print(date_time + " : AC Power " + AC_STATUS)
POWER_LOST_SEC += 1
if ( POWER_LOST_SEC == 1 ):
print(date_time + " : AC Power Lost - Shutdown in " + str(AC_LOSS_WAIT_MINUTES) + " minutes")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( POWER_LOST_SEC >= WAIT_SECONDS ):
print(date_time + " : Shutdown in progress due to AC power loss")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( TEST_MODE != "Y" ):
safeShutdown(GPIO_PORT)
else:
print(date_time + " : Started in Test Mode, No actual shutdown will occur, program will exit.")
break
if ( SHUTDOWN_TRIGGER == "Capacity" or SHUTDOWN_TRIGGER == "All" ):
if ( CAPACITY > CAPACITY_THRESHOLD ):
if ( TEST_MODE == "Y" ):
print(date_time + " : Battery Capacity " + CAPACITY_STATUS + " (" + str(round(CAPACITY,2)) + "%)" )
elif ( CAPACITY <= CAPACITY_THRESHOLD ):
print(date_time + " : Battery Capacity " + CAPACITY_STATUS + " (" + str(round(CAPACITY,2)) + "%)" )
print(date_time + " : Shutdown in progress due to battery Capacity below " + str(CAPACITY_THRESHOLD) + "% threshold")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( TEST_MODE != "Y" ):
safeShutdown(GPIO_PORT)
else:
print(date_time + " : Started in Test Mode, No actual shutdown will occur, program will exit.")
break
if ( SHUTDOWN_TRIGGER == "Voltage" or SHUTDOWN_TRIGGER == "All" ):
if ( VOLTAGE > VOLTAGE_THRESHOLD ):
if ( TEST_MODE == "Y" ):
print(date_time + " : Battery Voltage " + VOLTAGE_STATUS + " (" + str(round(VOLTAGE,2)) + "V)" )
elif ( VOLTAGE <= VOLTAGE_THRESHOLD ):
print(date_time + " : Battery Voltage " + VOLTAGE_STATUS + " (" + str(round(VOLTAGE,2)) + "V)" )
print(date_time + " : Shutdown in progress due to battery Voltage below " + str(VOLTAGE_THRESHOLD) + "V threshold")
soundBuzzer(BUZZER_ON,BUZZER_SECONDS,BUZZER_PIN)
if ( TEST_MODE != "Y" ):
safeShutdown(GPIO_PORT)
else:
print(date_time + " : Started in Test Mode, No actual shutdown will occur, program will exit.")
break
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.
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
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)
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.
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).
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.
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.
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.
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.
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~
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?
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??????)
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.
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.
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?
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.
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
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?
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
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?
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.
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.
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?
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.
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?
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
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....
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.
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Cindy