OpenSprinkler Forums Hardware Questions OpenSprinkler Pi (OSPi) Current reading like OS3 Reply To: Current reading like OS3



Not too hard — there is 0.2ohm current sensing resistor combined with an op-amp based precision rectifier. The signal can then be fed into the ADC (on OpenSprinkler, the microcontroller itself has ADC pins, whereas RPi doesn’t have built-in ADC but OSPi has a PCF8591 ADC chip on board).