Are there any low voltage (12-24 Vdc) PIR around? CPC et al all seem to be mains devices - well I assume they are as not voltage ratings are given.
Do these things "just" have a set of relay contacts as "output". thanks
Yes, chat to your local marina, car security shop or caravan showroom if you want to run them off 12-24VDC. Otherwise, most of the ones I've seen have a relay output.
Alarm PIRs run off a nominal 12v DC and have reed relay outputs. What do you want to switch?
hi Dave, Just general hobby stuff "on the bench" - nothing specific just now. Well, I was going to build the "cat water pistol deterrent" - but don't want to involve the mains in that. (Power the lot from a spare car battery - if the project gets that far :-) )
As Dave L said, Alarm PIR sensors (not usually water proof, but could be made to be) run off 12v, however, they normally only have normally closed (N/C) connection, so when they see somthing this opens a circuit, rather than closes it.
You could use a small relay to reverse this, then the second relay can be used to switch on your 12v pump, or a 12v valve connected to the mains water like this.
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