Project 8 - A PIC ultrasonic range finding

• The PIC sonar range finder works by transmitting a short pulse of sound at a frequency inaudible to the ear.
• This frequency can be classified as ultrasonic sound or ultrasound.
• Afterwards the microcontroller listens for an echo.
• The time from transmission to echo reception lets you calculate the distance from the object.
• The project uses 5 standard transistors to receive and transmit the ultrasound.
• It also used a comparator to set the threshold echo detection level.
• The ultrasonic transducers are standard 40kHz types.

Details can be found HERE