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Schematic

Layout

3D View

Schematic of PID Controller
Thermistor
1N4007
Optocoupler
R7
Resistance
120 Ω
R1
Resistance
200000 Ω
2N2222
End of Life
External 5V power source for alarm buzzer.
+5 V
R3
Resistance
330 Ω
Voltage divider for Thermistor.
RC circuit to convert PWM signal to analogue.

PID Controller