Comment Infrared Sensor taped on meter? (Score 1) 215
I once purchased a device for a mac (macos) that I believe was called ADControl. It was a box that had several analog and digital inputs and outputs. They sold an IR based sensor that you glued/taped to the outside of the meter which sensed the black mark on the "wheel" spinning in the older style electric meters. You then calibrated the pulses into watt-hours based on the number of pulses in a set time vs the increment on the dials. I would imagine such a sensor would not be hard to recreate.