A draft, not yet complete...
A digital timer that uses a potentiometer and ADC to select a time interval. The input triggering circuit is isolated from the mains using an optocoupler.
BT136 triac
MOC3061 optocoupler
pic12f675 - the cheapest microcontroller i could find, with an ADC.
The potentiometer is missing in the circuit below, its connected to the ADC
For the source code, see https://github.com/manojmo/pic_micro/blob/master/pot_minutes_calc.c
Based on the potentiometer voltage read from the ADC, it calculates the ON time, turns on the triac, waits till the ON time expires, then turns OFF the triac.
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