Tiny Power Consumption Meter

• Max: 20V supply
• 0.1mA resolution
• Max: 400mA load (1A or 2A also possible with lower resolution)
• Measure frequency 70Hz

Displays:

• mA and mW
• average mA and mW since start
• mAh and mWh since start
• Load V
• Measure frequency
• Run time

Ardunio code included

Parts needed:

• Arduino Nano - ATmega328P
• Adafruit Feather INA219
• Display 0.91 inch 128x32 i2c SSD1306

Optional:

• 1A Schottky diode
• 100uF 30V (connect parallell to load)

.

Running the meter and the load from USB power only:

Running the meter and the load from external power supply 7-20V:

Optionally you can connect a Schottky diode from the Arduino boards USB connector 5V pin to the Arduino boards VIN pin. Then you can connect power to either the USB connectorOR an external power supply to the VIN pin without rewiring anything.

Arduino Code

You might want to check back at some time since there might be updates to the code in main.ini. I use an Arduino Nano board that has Bluetooth (Keywish BLE-Nano) so I might add something with that, who knows...

Category: Electronics