We’ll stipulate that an Arduino may be overkill ... read the temperature sensor, and turn the AC on or off accordingly. Setpoint and current temperature are displayed on an OLED screen.

Want to sense air temperature? There’s a sensor for that. Particulate content in the air? There’s a sensor for that, too. Someone sneaking up on you? Get yourself some passive infrared sensors ...

LEM had introduced two fast precision high current sensors for ac, dc and pulsed currents: a 2MHz 1,500A type and 1ns 1,000A type. IN 1500-S is for measuring up to 1.5kA across a 2MHz (±3dB) bandwidth ...