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timer control

timer control

timer control

(OP)
Hey there: I need to control 4-6 on functions per day for a on time of 5-30 seconds per event. I am a mechanical guy so out of my depth with the wires. The system is 12 volt for a greenhouse irrigation system. Thanks!

RE: timer control

I do not know your question, but if you wanted suggestion for selecting the controller, then have a look at the Siemens LOGO! smart-relays.  Other manufacturers also have similar products - Allen Bradley Pico, Schneider Zelio, Teco SG2, etc.

RE: timer control

Do the 4-6 functions need separate times, or could they all be on at the same times.  It could be as simple as using a repeat cycle timer relay, or one for each function. You will need one with 2 time selections, one for the interval time, and one for the on time.

RE: timer control

(OP)
Best I use an example: I have eight stations which need 12v dc applied to a solenoid operated valve four different times a day. The  eight stations run in sequence (1 minute apart) for a duration between 10-40 seconds. Eight minutes and the stations will cycle once each. I can get 12v dc timers, but they do not program in seconds only minutes. It may be too expensive to get this done electronically. I can solve this with a mechanical solution using the cheap dc timers operating the cycles for 1 minute. Just figured I'd toss this one up for inspired thinking and suggestions. The application is a hydroponic garden control system we are putting together. My company: http://sunstateorganics.com  

thanks  

RE: timer control

Here is another possible solution

http://www.pic-bee.com/LFX_main.html

You can program the relays to pulse on and off, etc over the serial interface.  Also has IR control as well.

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