Adafruit INA3221 - Triple 0-26 VDC, ±3.2 Amp Power Monitor

This breakout board will solve all your multi-rail power-monitoring problems. Instead of struggling with up to 6 multimeters, you can just use the handy INA3221 chip on this breakout to both measure both the high side voltage and DC current draw of up to three power supplies over I2C with ±1% precision.Most current-measuring devices such as our current panel meter are only good for low side measuring. That means that unless you want to get a battery involved, you have to stick the measurement resistor between the target ground and true ground. This can cause problems with circuits since electronics tend to not like it when the ground references change and move with varying current draw. This chip is much smarter - it can handle high or low side current measuring, up to +26VDC, even though it is powered with 3 or 5V. It will also report back that high side voltage, which is great for tracking battery life or solar panels.A precision amplifier measures the voltage across the built-in 0.05 ohm, 1% sense resistors. Since the amplifier maximum input difference is ±163.8mV this means it can measure up to ±3.2 Amps. With the internal 13 bit ADC, the resolution at ±3.2A range is 0.4mA. Advanced hackers can remove the 0.05 ohm current sense resistor and replace it with their own to change the range (say a 0.01 ohm to measure up 16.4 Amps with a resolution of 2mA)