As the floodlight PIRs use mains current to drive the lamps, I just hooked one up to a washing machine solenoid valve, through to a hosepipe with a jet nozzle. Heh, they work *really well* - I once had a cat problem, with them tearing into our rubbish bags at night in our back garden. I found this clip after I completed the build, Enjoy, I know that I did… I am starting to find that no matter what you do there is always someone that has done it before you. Other relay coil to Transistor Collector and Diode Anode I have built another that triggers a Zombie Hand Halloween prop in another instructable. One of mine is currently attached to a water valve solenoid from an old washing machine which is attached to a garden hose and is used to scare a skunk out of my back yard… Now you can attach your favorite electrical device to the NO and GND contacts of the relay for activation. Now when the sensor is tripped the LED activates and the relay is activated. Seal and protect all bare wiring with electrical tape or Hot Glue to protect against shorting. You should hear the relay trip when the LED is active. The other relay coil terminal is connected to the 12V ground of the circuit.Īttach your power source and test for operation. The Transistor Emitter (E) is connected to ground.
The other relay coil contact is connected to The transistor Collector (C) and the diode Anode The 12V power is connected to the one relay coil contact and diode Cathode, Using standard transistor wiring, Connect the LED power wire to the Transistor Base (B) My relay needed 12 V to trigger and since there was only a fraction of that for driving the LED I used a 2N3904 in TO-92 form since I had several of them in my parts bin.
Since there is not much room in the sensor case I chose to connect a relay at the opposite end of the wires.