https://github.com/charkster/ina219

INA219 Log Battery Voltage and Charge Current to file
https://github.com/charkster/ina219

adc ina219 raspberry-pi

Last synced: 3 months ago
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INA219 Log Battery Voltage and Charge Current to file

• Host: GitHub
• URL: https://github.com/charkster/ina219
• Owner: charkster
• License: mit
• Created: 2019-01-22T01:45:21.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2022-10-22T23:19:16.000Z (over 3 years ago)
• Last Synced: 2025-01-13T19:27:22.195Z (over 1 year ago)
• Topics: adc, ina219, raspberry-pi
• Language: Python
• Homepage:
• Size: 10.7 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
![picture](https://cdn-learn.adafruit.com/assets/assets/000/002/452/medium800/adafruit_products_ID904_LRG.jpg)

INA219 Log Battery Voltage and Charge Current to file

These 3 python files will allow you to use a INA219 board (like the ones on adafruit and amazon) to log voltage and current to both the screen and a file once every second.

I use this to monitor my batteries as they charge.

INA219.py          <- this is the python class to communicate with the INA219 board

rpi_i2c_new.py     <- this is the raspberry pi I2C that adds additional debugging and has bit field operations

ina219_example2.py <- this is the top-level script that initializes the INA219 board and defines the file to log to

I replace the sense resistor on my INA219 boards with a 10milli ohm resistor as to not have a large voltage drop when charge currents reach 2-3amps.

To obtain the needed calibration value (see the cal_device routine) I use a 40 Ohm 2W resistor and use a 5V power supply. I modify the calibration code until I see the proper 125milli amp result.

Manual calibration allows you to get the best calibration code for your specific sample resistor.

To stop the logging just press control-c.

For measuring charge current for a phone I cut a usb c type cable to put the VBUS wires through the INA219 terminal. A connection to GND is needed for the voltage measurement.