Hi to All, I'm trying to do a ultrasound distance measurement with PIC, I don't want to use the Polaroid module. Does anyone has some experience to share? I know how to generate the transmition pulse but I need help in the receiver part. The range will be from 20 to 200 inches. Best regards, Octavio ====================================================== Octavio Nogueira - e-mail: nogueira@mandic.com.br http://www.geocities.com/~oct_nogueira "ProPic" Production PIC Programmer Windows under US$20 ======================================================