Step 6Wiring
The last step of the birdtweeder is detecting the arrival of a bird. I used an IR emitter-detector pair to sense bird arrival. When the bird lands on the perch of the feeder it will block the infrared light of the emitter from reaching the detector. I've included schematics for the emitter and the detector. Connect the output to one of the analog pins on your Arduino and you will be ready to go. Now you can trigger the camera to take a picture whenever a bird blocks the IR detector.
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