It runs on an Arduino MEGA 2560 PRO (or similar microcontroller) and supports a wide array of additional hardware including pressure transducer, water level sensor, flow meter, OLED display ...
The multimeter is soon replaced by an Arduino with the help of an AD623ARZ ... For more HVAC projects check out this pinwheel flow meter and [Adam]’s piece on HVAC techs, hackers who make ...
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