I created a circuit that utilizes a LM555 and an 4017 that will tell the user when to start brushing a different area. Each led will be on for 30 secs.
Parts List:
(2)104 Capacitor
10uF Capacitor
2M Pot
(2)1k Resistor
4.7k Resistor
LM555
4017
(4) Led’s
SPST Switch
Minimum 5v power supply