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Figure 16 - Attaching the Fresnel lens to the reverse engineered sensor board
Figure 16 - Attaching the Fresnel lens to the reverse engineered sensor board

When you are done hacking and reverse engineering the motion sensor board, it will be ready for your other projects, but will require the Fresnel lens to be attached again. If your sensor casing slit so that the front half included the Fresnel lens like the one shown in Figure 16, then you can just use a little hot glue to fasten the circuit board in the same place it was before you hacked the system. The Fresnel lens expands the field of view, allowing the sensor to see an entire room or yard rather than just a few inches in front of its tiny glass window. Of course, feel free to test the sensor response with no lens as it may work perfectly in your own application, if short range is all that is needed.



Figure 17 - This is the relay driver board that safely controls the camera functions
Figure 17 - This is the relay driver board that safely controls the camera functions

The small relay driver board shown in Figure 17 will create a bridge between your newly hacked motion sensor and the hacked digital camera. This is a previous project called the "Camera Trigger Hack". The idea behind the relays is that no voltage is sent to the camera, only the closing of a circuit, which emulates exactly the function of the original shutter release switch that has been hacked out of the camera. Since most digital cameras have a two position shutter release switch (focus and shoot), there are two relays used to copy this operation. In this project however, both functions are tied together as the camera will need to respond quickly to the motion sensor. The downside to this is that the camera may not have time to spot focus on extremely fast moving targets.

If you kept the original relay working on the motion sensor board, then you do not need to use a separate relay board as you will already have the required isolation offered by the relay on the motion sensor board. As long as you are only connecting to the contact points on the relay, then no voltages will be sent from your motion sensor system, only an open or closed circuit, just like the original shutter release switch in the digital camera.

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