Hi everyone, Ok This buddy of mine put a normally open contact alarm system in for himself. Just a basic basic basic system where he punches his code in the keypad, that puts V on all the door/window contacts one side and if you open the door/window it just energizes a relay which locks itself in (like a motor starter) and uses the other N.O contact on the relay for the siren. I know, I know damn electricians........ Anyway, he bought a motion sensor but he cant make it work because the trigger is normally closed and opens on movement. I drew this attachment and worked it up on a breadboard and seems to be working, I clamp pos and neg with a resistor in between, when the contact goes open the Vce will conduct again triggering a small relay which will trigger the master relay setting off the alarm. What do you think? Is it okay for now? Thanks, Jim
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