@▷ Dual Fan Controller by ATtiny45 | Diagram for Schematic

Dual Fan Controller by ATtiny45

Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees. This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79.

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Electronic C, microcontrol