We have realized Mike Gasperi's Almost Ultrasonic Motion Sensor . Here an additional PC-board. (View from above)
|R1, R3, R6, R8||1 kOhm resistor|
|R2, R4, R5, R7||100 kOhm resistor|
|R9, R10||33 kOhm resistor|
|C1||100 nF capacitor|
|C2||6800 pF capacitor|
|C3||1 mF electrolytic capacitor|
|C4, C6||33 mF electrolytic capacitor|
|C5||missing (in Mike's circuit diagram this is the crystal microphone)|
|caution||do not forget the wire that you should solder on the back of the board. (Ratnest)|
The sensor may be used as shown on Mike's page. We used it also as a simple sound sensor.
Here is a photo of our finished sensor and a video of it's function as simple sound sensor.
Click here to see the video.