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This sample Python script is designed to run on a Raspberry Pi 5. It measures and reports key electrical parameters, including battery charging/discharging voltage and current, as well as the output voltage and current of both the 12V and 5V UPS power rails.

This tutorial assumes you've already set up a Raspberry Pi with Raspbian12(bookworm). For help installing the Debian-based OS on your Pi, check out the docs on Raspberrypi.org.

1.0 Editing the EEPROM configuration
1.1	From the command line or Terminal window start by running the following command :
	pi@raspberrypi ~ $ sudo rpi-eeprom-config -e
	Change the setting of POWER_OFF_ON_HALT from 0 to 1 , Add PSU_MAX_CURRENT=5000 at the end of the file that reads like this:

1.2	Reboot your Raspberry Pi 5 to make the change take effect.
	pi@raspberrypi ~ $ sudo reboot

2.0 Configuring the Raspberry Pi for I2C
2.1	From the command line or Terminal window start by running the following command :
	pi@raspberrypi ~ $ sudo raspi-config
	This will launch the raspi-config utility. Select "Interfacing Options"


2.2	Highlight the “I2C” option and activate "<Select>"


2.3	Select and activate “<Yes>”


2.4	Highlight and activate “<Ok>”


2.5	Activate "<Finish>", this will exist the raspi-config utility.


2.6	Update your Pi and Install the required dependencies
	pi@raspberrypi ~ $ sudo apt-get update
	pi@raspberrypi ~ $ sudo apt-get upgrade -y
	pi@raspberrypi ~ $ sudo apt-get install python3-pip

2.7	Download the required scripts
	pi@raspberrypi ~ $ git clone https://github.com/suptronics/xups2.git

2.8	Reboot the Raspberry Pi
	pi@raspberrypi ~ $ sudo reboot
	The Raspberry Pi will reboot and the interface will be enabled.

2.9	Once you have logged into your Raspberry Pi from the command line, run the command to see all the connected devices
	pi@raspberrypi ~ $ sudo i2cdetect -y 1
	#40 - The INA219 sensor's I2C address for battery monitoring (charge/discharge) #41 - The INA219's I2C address for monitoring the UPS 12V output voltage and current. #44 - The INA219's I2C address for monitoring the UPS 5V output voltage and current.

3.0	Command to monitor battery charging & UPS output status
	pi@raspberrypi:~/xups2 $ sudo python3 xups2-pms.py