ARuino adaptible termostat with heat and cold function. ou can control temperature with two circuit Cold and Heat. It is simple. Just set temperature and regulator make all.
Part list:
LCD 16X2 ARduino NANO double relay board DS18 thermosensor DHT11 thermo+hummidity 3xLED (R;G;B) KY-040 torgue button
Sensors: sensor DH11 works for short information.
Two sensors DS18 are in work. This check temperature and correcting heater/cooling. First sensor check temperature and give 1 and 2 temperature. If you connect second temperature sensor (I use waterproof sensor for check temperature into fluid) this sensor give the first temperature used for correction.