Timer choice and circuit design for instrument automation

Thread Starter


Joined Apr 10, 2018
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:


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?


Joined Mar 10, 2018