This project is designed to control home appliances based on a fixed-time delay for each load by using a 555 timer to generate switching period intervals to drive a relay to switch ON or OFF for any load.
A time-delay based relay is a relay that stays on for a certain period of time once activated. This circuit is made up of a simple adjustable timer circuit that controls the actual relay. The time is adjustable from 0 to few seconds, but can be increased by increasing the time constant of the mono-stable 555-timer. The current handling capacity of the load is limited by the kind of relay used. The project is offered with a lamp as a load.
- Fixed- time delay
- 555 timer
- Simple adjustable timer circuit
- Monostable 555-timer
- 555 IC