Ultrasound Radar using PIC16F628
If you are an experienced programmer, you can easily program the PIC16F628. The circuit above
is an ultrasound radar working at 40KHz. One can simply measure the distance of an object
knowing that sound travels at approximately 340m/s. Where D=(v)(t), and since you must measure
the time at which you receive the incoming pulses, make sure to divide the time by 2 resulting
in a measured distance D=170 x t. The sensors are ultrasound devices with a center frequency
of 40KHz ( Murata has several models). The frequency can be programmed on line RA1.
The microcontroller will drive an LCD display which can be programmed to have almost any
content. Make sure that the transmit and receive sensors are at least 2.5 inches apart, this
will limit the crosstalk.