X1201-v1.1 Hardware & Installation

Hardware Description

1. Raspberry Pi GPIO Used

PIN#
GPIO
Functions

3 GPIO2 I2C-SDA, battery fuel-gauge systems - reading battery voltage and percentage

5 GPIO3 I2C-SCL, battery fuel-gauge systems - reading battery voltage and percentage

31 GPIO6 AC power loss & power adapter failure detection, Low-power supply failed, High-power supply OK

36 GPIO16 Control battery charging, High-charging disabled, Low-charging enabled

*The UPS connects to the Pi GPIO via pogo pins. If the I2C address (0x36) is not detected or fails to read AC power state or control charging, please ensure to clear the leads of the pins used on the GPIO header from the bottom of the Raspberry Pi PCB and then reinstall it.

2. Battery Voltage Level Indicators

Battery Voltage Range (V)
D1
D2
D3
D4
Remark

3.87-4.2 ON ON ON ON Discharging levels of 100%

3.7-3.87 ON ON ON OFF Discharging levels of 75%

3.55-3.7 ON ON OFF OFF Discharging levels of 50%

3.4-3.55 ON OFF OFF OFF Discharging levels of 25%

Below 3.4 OFF OFF OFF OFF Low battery

Required Hardware

• X1201 UPS Shield
• Raspberry Pi 5 Model B
• 18650 battery 2pcs
• USB-C Power Supply 5V 5A

Hardware Installation

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