How to Make an Electronic Timer?

I need to make a circuit for an electronic timer. It should have an ONtime= 23hrs50mins and an OFFtime=10mins. I was thinking of using an Arduino/Arduino standalone connected to a relay for this project. Any Ideas do share

rickharris3 years ago

If you need accuracy then a micro controller with a real time clock is the way to go.

A 555 will not be accurate enough over a long time.

Otherwise buy a plug in mechanical timer they are cheap enough.