Does anyone have an idea where I can find a schematic or tutorial to build an ultrasonic motion detector? I see many circuits and premade sensors available, but my problem is they all have a long sensing distance. I need a maximum of 8" sensing distance. I want it to have an output to operate a transistor switch triggering a 555 timer. Can the sensing distance be made adjustable on ultrasonics.
I'm using infrared for the sensor now, but would like to experiment with ultrasonics. I think it might be a more reliable detector with less false triggers. Any help would be greatly appreciated.
I'm using infrared for the sensor now, but would like to experiment with ultrasonics. I think it might be a more reliable detector with less false triggers. Any help would be greatly appreciated.