HUMIDITY CONTROLLER

This circuit is used to automatically switch ON/OFF machines like motor pump of room cooler. The circuit works on 6V DC supply. In this circuit a timer IC(NE 555) is used. Its pin no.4 and 8 are given the positive supply and pin no.1 is given the negative supply. Resistance R1(1k) and capacitor C1 (470 MF/16V) from the charging/discharging process. On/Off time depends on the Value of R1. Base of transistor T1(AC 187) is connected with IC pin no.3 through a resistances R3(8.2K). Its Output is given the relay. The moment Relay switches ON, the motor starts and in the same when the relay switches OFF the pump also switches OFF.