Archives For water level indicator

Water-DropletWater pump controller senses the level of water in a tank and drives the water pump. The circuit described here is built around timer IC1 (555). When the water level of tank goes below the low level marked by ‘L’ the voltage at pin 2 of IC1 becomes low. As a result, internal SR-flip-flop of IC1 resets and its output goes high. This high output pin 3 of IC1 drives relay driver transistor T1 (BC547) and energies relay RL1. Water pump gets mains power supply through n/o contacts of the relay and is powered on. It starts filling water in the tank. Continue Reading…