The connection is pretty standard - CLK (Arduino Uno pin 13), MISO (Arduino Uno pin 12), MOSI (Arduino Uno pin 11) and CS (Chip select). I used an SD card breakout similar to the Adafruit one (so I used that in Fritzing, as that was the closest part). Wattson - with CFL Lamp load plugged in Circuit Once in the enclosure, all you need to do is plug the cable into an existing outlet, and plug any device into the outlet on the enclosure - the PCB is designed for currents up to 12A, so it is quite well built! It is calibrated to measure currents up to 4A (so I could be able measure really small currents for measuring standby power - the MCP39F521 chip on which it is based has a 4000:1 dynamic ratio, meaning it can measure from 4A down to 1mA)Īrduino Energy Logger with Dr. Wattson is completely isolated from the mains, as the energy measurement is done in an isolated manner using current and voltage transformers, so those are perfectly safe to handle. We’ve now released version 2 of the board (available here ), and will be releasing an enclosure for the V2 board soon! An updated version of the enclosure shown above is available on Tindie.
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