Description
This is a temperature sensor control system that aims to recreate a household central air conditioning (heating/cooling) system.
The circuit operates by the user switching between three modes (Ambient, Set and Run) of operation via a push button and adjusting the temperature settings via a variable resistor (potentniometer).
Ambient = Ambient Temperature
Set = Set desired room/object temperature
Run = perform cooling or heating in order to obtain and maintain that specific set temperature.
The parts you will need:
Semiconductors Resistors (0.5W, 1%) Resistors (5W, 10%) Capacitors Other
1 x 1N4001
1 x 5mm red LED
1 x 5mm blue LED
3 x 3mm green LED
2 x 2n2222
2 x BD139
2 x LM335
1 x LM7805
1 x PIC16F876A
1 x PIC12F675
1 x QP55143 x 1.5k
2 x 2.2k
2 x 3.9k
3 x 4.7k
1 x 6.2k
1 x 10k
1 x 10k trimpot (single turn)5.6 ohm wirewound 2 x 18pF (ceramic)
1 x 1nF (ceramic)
3 x 100nF (ceramic)
3 x 10uF (electrolytic)
1 x 100uF (electrolytic)1 x 40mm 12V fan
1 x 4Mhz crystal
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