Compact Volt / Amp meter using Arduino nano, a 128x64 OLED display and the INA219 high side current sensor.
Single button interface with short/long press.
Features:
- Display voltage, current, watt and mAh
- Calculates mAh with manual reset.
- Select INA219 ranges 32V/16V and 3.2A, 1.6A, 0.8A or 0.4A.
- Select INA219 averaging 1 to 128 samples
- Select sampling rate 100, 200, 500 or 1000 ms.
- Enable/disable sensor sleep to lower leak current in sensor.
- Settings are stored in EEPROM and reloaded on boot
- Print results on serial.
- Change settings with serial commands.
- Input detection with range feedback.
BOM:
- Arduino Nano
- INA219 sensor board (compact purple board)
- OLED 0.96" I2C 128X64 4-pin.
- TTP223 Capacitive Touch Switch
- Female Power Supply Jack Socket Mount
- Male Power Supply Jack
- Slide Switch 2 Position 6 Pin
- 5 pin male & female connector (optional)
Find guide and more here: https://www.instructables.com/id/Tiny-VA-Meter-With-INA219/