This would be a great application for an Arduino with a simple LCD readout.
Below is what I put together to run and monitor a ground-based prototype AC system for what I eventually installed in my homebuilt airplane. The display shows PWM power to the variable-displacement compressor as well as high-side pressure and evaporator temperature. The pressure sensor being monitored (and used to modulate the compressor) is a standard GM 3-wire AC sensor and the evap temp sensor is a thermistor from a Honda.
Last edited by hgerhardt; 04-24-2022 at 02:40 PM.
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