hi, i have arduino nano and sensor INA219 buy from adafruit. I have executed the instructions of the page Overview | Adafruit INA219 Current Sensor Breakout | Adafruit Learning System.
at module sensor, at Vin- i have connect a negative 12Vcc, at Vin+ i have connect positive 12Vcc whit serial resistor of circa 500ohm.
Next i have use program and this is log:
Hello!
Measuring voltage and current with INA219 ...
Bus Voltage: 0.00 V
Shunt Voltage: 2.35 mV
Load Voltage: 0.00 V
Current: 16.60 mA
Power: 11.00 mW
Bus Voltage: 1.08 V
Shunt Voltage: 2.35 mV
Load Voltage: 1.08 V
Current: 23.40 mA
Power: 20.00 mW
Bus Voltage: 1.14 V
Shunt Voltage: 2.35 mV
Load Voltage: 1.15 V
Current: 23.80 mA
Power: 113.00 mW
Bus Voltage: 0.00 V
Shunt Voltage: 1.70 mV
Load Voltage: 0.00 V
Current: 23.50 mA
Power: 25.00 mW
Bus Voltage: 0.93 V
Shunt Voltage: 2.35 mV
Load Voltage: 0.93 V
Current: 20.00 mA
Power: 0.00 mW
Bus Voltage: 6.66 V
Shunt Voltage: 2.36 mV
Load Voltage: 6.66 V
Current: 23.50 mA
Power: 8.00 mW
Bus Voltage: 1.17 V
Shunt Voltage: 2.35 mV
Load Voltage: 1.17 V
Current: 23.50 mA
Power: 187.00 mW
Bus Voltage: 0.00 V
Shunt Voltage: 2.35 mV
Load Voltage: 0.00 V
Current: 17.50 mA
Power: 18.00 mW
Bus Voltage: 1.00 V
Shunt Voltage: 2.35 mV
Load Voltage: 1.01 V
Current: 23.60 mA
Power: 20.00 mW
Bus Voltage: 2.39 V
Shunt Voltage: 2.35 mV
Load Voltage: 2.39 V
Current: 23.60 mA
Power: 120.00 mW
Bus Voltage: 0.00 V
Shunt Voltage: 1.62 mV
Load Voltage: 0.00 V
Current: 23.40 mA
Power: 26.00 mW
Bus Voltage: 0.91 V
Shunt Voltage: 2.34 mV
Load Voltage: 0.91 V
Current: 15.70 mA
Power: 0.00 mW
Bus Voltage: 5.00 V
Shunt Voltage: 2.34 mV
Load Voltage: 5.00 V
Current: 23.60 mA
Power: 21.00 mW
Bus Voltage: 1.10 V
Shunt Voltage: 2.34 mV
Load Voltage: 1.10 V
Current: 23.60 mA
Power: 172.00 mW
Bus Voltage: 0.00 V
Shunt Voltage: 1.78 mV
Load Voltage: 0.00 V
Current: 18.00 mA
Power: 29.00 mW
Bus Voltage: 0.56 V
Shunt Voltage: 2.36 mV
Load Voltage: 0.57 V
Current: 23.50 mA
Power: 0.00 mW
Bus Voltage: 8.77 V
Shunt Voltage: 2.35 mV
Load Voltage: 8.77 V
Current: 23.70 mA
Power: 102.00 mW
Bus Voltage: 0.83 V
Shunt Voltage: 2.03 mV
Load Voltage: 0.83 V
Current: 23.50 mA
Power: 26.00 mW
Bus Voltage: 0.89 V
Shunt Voltage: 2.34 mV
Load Voltage: 0.89 V
Current: 16.00 mA
Power: 0.00 mW
Bus Voltage: 4.95 V
Shunt Voltage: 2.35 mV
Load Voltage: 4.95 V
Current: 23.50 mA
Power: 21.00 mW
Bus Voltage: 1.09 V
Shunt Voltage: 2.34 mV
Load Voltage: 1.09 V
Current: 23.50 mA
Power: 172.00 mW
Bus Voltage: 0.00 V
Shunt Voltage: 1.75 mV
Load Voltage: 0.00 V
Current: 18.00 mA
Power: 33.00 mW
Bus Voltage: 0.58 V
Shunt Voltage: 2.34 mV
Load Voltage: 0.58 V
Current: 23.60 mA
Power: 0.00 mW
Bus Voltage: 8.24 V
Shunt Voltage: 2.36 mV
Load Voltage: 8.24 V
Current: 23.80 mA
Power: 102.00 mW
Bus Voltage: 0.83 V
Shunt Voltage: 1.94 mV
Load Voltage: 0.83 V
Current: 23.60 mA
Power: 26.00 mW
Bus Voltage: 0.87 V
Shunt Voltage: 2.34 mV
Load Voltage: 0.87 V
Current: 16.30 mA
Power: 0.00 mW
Bus Voltage: 4.66 V
Shunt Voltage: 2.36 mV
Load Voltage: 4.66 V
Current: 23.50 mA
Power: 21.00 mW
Bus Voltage: 1.10 V
Shunt Voltage: 2.34 mV
Load Voltage: 1.10 V
Current: 23.70 mA
Power: 128.00 mW
is visible some time power is instable, 180mW or 0mW,....
how is possible????
thanks