Improving water tank pump motor controller

Sameer Guptadesigned a robust water tank filling controller. First circuit is based on simple CMOS logic which detects when water fills the tank using two conductive electrodes. But he wanted to have more control, so he made another version which is based on AT89C2051 microcontroller. Controller does pretty same thing as predecessor, but have more features like blinking LED indicator, sound alarm and of course possibility to add more features. Continue reading