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Motion detection camera, sometimes called a trail camera, or wildlife camera.


  • Digital camera
    • Preferably quick at taking photos, with flash
  • Passive IR motion sensor (PIR sensor)
  • DPST Relay, 12V or 5V
  • Any Mosfet
    • Example: IRF640
  • Rectifier,
    • Example: 1N4001, 1N4002, 1N4003, 1N4004
  • 12V Voltage source
    • AC adapter, or battery
  • 5V Voltage source
    • regulated AC adapter or battery
  • digital inverter
    • Example: 74LS04
  • Wood, or plastic box for holding the camera
  • brackets for mounting camera and other components
  • Sealant for water-proofing
  • Glass
  • Glue


Basically what needs to be done is a the cameras shutter button is replaced with a relay controlled by a motion sensor.


  • Dismantle digital camera
  • Remove the flash and solder wire to it, so it can be placed in another location
  • Remove any speakers or buzzers in the camera, so it won't make any noise.
  • Attach three wires to the focus/shutter button.
    • One attached to common, focus, and shutter
  • Solder the wires to the relay, like in the schematic
    • I covered the relay in foam to quiet the relay, so animals don't get scared.
    • If you can find a 5V relay, then you won't need a 12V source
  • Solder three wires to the PIR sensor
    • Power, ground, and signal
  • Solder the rest of the circuit together, like shown in the schematic.
    • Inverter may not be needed. If the PIR sensor's signal line is normally low, you don't need the inverter. My PIR sensor's signal line is normally high, so needed to add the inverter.


Motion sensing wildlife camera-motion sensor relay-schematic.svg

Box Construction