The “A” version is not as precise as the “B” version. If you are into this sort of thing, the INA219 actually comes in two versions. This basic circuit would work well for a data logger or current monitor with just a few software changes. The layout is neat although he’s working on a PCB, as well. ![]() But the addition of a INA219 current sensor provides voltage, current, and power measurements in a single module that talks I2C back to the host computer. Of course, measuring a voltage with the Arduino is old hat. The range is only up to 26 volts and 3.2 amps, but you could extend that with some external circuitry. The Arduino-based instrument measures DC voltage, current, power, energy, capacity, and temperature. If you are dealing with solar or battery power, you might want to have one of these little energy meters built by around.
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