Timer choice and circuit design for instrument automation

Thread Starter

blinker337

Joined Apr 10, 2018
1
Hello, I need some help choosing the appropriate timer(s) for an instrument I am attempting to design. I am not a control engineer, and I'm learning electronics, so I know just enough to be dangerous. I'm currently more into tweaking existing designs.

I need to control three solenoids over a 24-hour period every three days. Every three days, I need to open a solenoid at 0:00 and close at 8:00; the second opens at 8:00 and closes at 16:00, and the third opens at 16:00 and closes at 23:59 (or at 0:00 the next day). I need the timer to be easy to use and re-program by a user in the field, most likely just changing days of operation since the time periods are static.

I was thinking along the lines of using one of the timers on this page:

http://www.newark.com/w/c/automation-process-control/panel-displays-instrumentation/panel-instrumentation/prl/results?st=time+switch

I have experience with the Omron H5S-WB2, but it only controls two channels. I could install two of these and take care of it that way.

Or is there a circuit that could incorporate a single-channel timer?
 

danadak

Joined Mar 10, 2018
4,057
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