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===Function Description===
[[File:X728-IMG-7960-1.jpg|500px]]
[[File:X728 funciton description 2.jpg|500px|none|X728 funciton description]]
* '''X728-A1 supports [[X750]]/[[X758]] also.'''
AQ8:Because there What are so many kind of batteries, GPIO5 and the quality is also various. So we suggest to use the NCR18650B from PANPASONIC.GPIO12 used for?
X728
,[[File:X728-A2-IMG-8211-Packing-List.jpg|thumb|right|X728-A2 Packing List]]
[[File:X728-PCB.png|thumb|right|X728 PCB Layout]]
[[File:X728+X728-A1+X728-A2.jpg|thumb|right|X728+X728-A1+X728-A2]]
[[File:X728+X728-A1+X728-A2-1.jpg|thumb|right|X728+X728-A1+X728-A2]]
{{GD Template Impl}}
==X728 V1.3 is released==
X728 V1.3 is released at Febuary 2021.
* V1.3 <span style="color:red;">removes</span> the ASD harware function and adds power surge protection function, but we '''new add''' the software shutdown python script when battery is low voltage, please rerfer to [[X728-Software]]
* 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.
* <span style="color:red;font-weight:bold">Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket.
* <span style="color:red;font-weight:bold">Do not use 18650 battery with built-in protection circuit
==Packing List==
* 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==
==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:
# Place 18650 battery again and wait a few seconds before testing
3. What battery is recommendedfor 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. Q2: We want automatic shutdown when the external AC power supply is disconnected, is possible? A： Yes. you can program a script to get this function. Example (The following is a pseudo code):<pre> while (1) { // invoke the API to get AC PSU status: connected or disconnected int disconnected_flag = getACPSUStatus(); // please refer to the user manual to achieve getACPSUStatus function; int battery_voltage = getBatteryVoltage(); // please refer to the user manual to achieve getBatteryVoltagefunction; // You can make your own actions based on disconnected_flag and battery_voltage, you can only select one condition also if (disconnected_flag) { // execute linux or software shutdown command } sleep(10);} </pre> 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 <span style="color:red;">after 3 seconds</span>,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
A: GPIO5 control shutdown, GPIO12 BOOK OK.
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