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1. Make sure you enable i2c interface, refer to [[How to enable I2C]]
2. The UPS connects to the Pi GPIO via pogo pins, If the I2C address (0x36) is not detected, Please clear the leads of pin 3 and pin 5 on the GPIO header from the bottom of the Raspberry Pi PCB and install again, and cso also check if the pogp pogo pin of ups shield is in close contact with the pad position of PI 5.
[[File:Pi5-gpio-pin.jpg]]