Figure 4. Shape of the Solenoid Shutter. Left : Shutter Motor is Opened. Right : Shutter Motor is Closed
The prototype module’s size and actual object for sensing pipe is shown in Figure 5. To widen the detection angle, the distance between Fresnel lens and PIR sensor should be 7.5mm, while the distance for edge of sensing pipe from shutter should be 5mm. Figure 5(b) shows the “on” and “off” states of a shutter without Fresnel lens. Fresnel lens can be inserted easily for completing the sensing module. The sensing pipe was done through a 3D printer.