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One thing to note is this is mainly meant for Arduino UNO. You need 5v to trigger this Relay. Arduino gives 5v output which you can connect to IN to trigger the Relay. If you are planning to use this directly with a PIR Sensor (Motion sensor) connecting the PIR 3.3v out to this Relay IN will not work. I hacked this by connecting (soldering from back of the PC board) the PIR out directly to the Emitter leg of the Octocoupler on the Relay board. it worked well. You can also use a transistor (BC547 NPN) where you can apply the 3.3v from PIR and push 5v from source to the Relay IN.
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