The first day of school. The eager expectations of meeting new friends, getting to know your new teacher, finding your new desk.
As you do so make a note of how everything is hooked up. You need to identify which color wire is what. Here is the scheme used by most sensors: It will most likely be the white neutral one since the sensor switches the black hot one.
I have seen sensors that switched neutral before though.
How you do this will depend on the exact sensor you have. Find the relay Look at the component side of the circuit board.
You need to find the relay the part that acts like the switch. Here is the relay in my sensor: Mine has four, but yours may have up to 8 or more.
Identify relay connections Here is a simplified schematic of how the relay will be connected: Here are some hints: The power in connection should go to one of the power in wires most likely black, but maybe white The switched power out connection will go to the red output wire The remaining connections are for the coil and probably go to a bunch of random circuitry.
Here are the connections on my sensor: Cut the power The first mod we need to do is to cut the power going through the relay without disrupting power to the rest of the circuitry. When you cut the trace, make two cuts then use the knife to peel up the copper in between. If you just make a single cut you run the risk of electricity arcing across the small gap.
The other possible scenario is that the relay will be in the middle of the trace, with power coming in one side and some circuitry connected on the other. Add a second output wire Now that there is no power going through the relay, we need to solder on an additional wire to the relay connection we just isolated.
Put everything back together. You should now have a motion sensor with four wires coming out of it. The black and the white wires provide power to the sensor and should be connected to VAC. The red wire and the new one you added purple on mine are connected to the contacts on the relay.
When the sensor detects motion, they are connected together. Hook the black and white wires up to power. Set your meter for AC volts. Trigger the motion sensor by waving your hand in front of it.
Check for voltage between the red wire and the white wire. Check for voltage between the red wire and the black wire. Check for voltage between the red wire and your new wire.
Now set your meter to test for continuity keep it connected to the red and new wire. If your sensor passes all the above test then you are ready to start controlling props with it.
Connecting the sensor This is the part where your imagination comes in.
As I said before, you can connect the two output wires to anything that is normally connected to a switch. Connect the power supply, sensor and LED in series.
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