The INA219 breakout board can be powered by the 5V or 3V pin on your Arduino and communicates via I2C.
Connect to the microprocessor
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Next we must insert the INA219 current sensor into the circuit we want to measure:
Connect to the circuit
- Connect V+ to the positive terminal of the power supply for the circuit under test.
- Connect V- to the positive terminal or lead of the load. This puts the sense resistor in-line with the circuit.
- Finally, connect a wire from the negative terminal of the power supply to GND. This allows the sensor to measure the load voltage as well as the load current.