Need to build a repeat timer

[grasstrimmer]

I am not new to electronics but would definitely not be a profesional so I need some help. I need to switch a relay on for about 30 seconds every 1-2 hours. I have been reading about the possible ways of doing this and am wonder if anyone has some idea on an easy way of doing it. Could I do this with a 555 and a 4060b or would there be a better way of doing it? The times do not need to be precise. Thanks

 

[KeepItSimpleStupid]

Would a commercial solution make more sense for you? What power source is available?

 

[grasstrimmer]

A commercial source would be fine, but I have been having trouble finding it in 12v. If anyone knows of anything that would work great also.

 

[Reloadron]

If you go commercial there are units like this. They come in 12 volt powered versions and you are looking for a repeat cycle version with programmable ON / OFF times. The link is to Macromatic but Omron and others make them also.

Ron

 

[SABorn]

I would simply use a 08m Picaxe chip with a transistor connected to output 2 driving the relay, and a simple little program like this below, to control everything.

You would need to change the "pause 1000" to a slightly lower figure to get near accurate time periods to allow for program instruction times but it will be close to correct as it is.

Pete.

 

[Shyamal]

Nice posting