Hi Guys, Any ideas where i could find a circuit for a microcontoller based ultrasonic "tape measure" or even any information on how i can go about building one. I want to use the least amount of components as possible. Thanks in advance. Kev. -- Kevin Darch. )} )z +[!C Senior Technical Advisor. kevin@aldareinvestments.com Aldare Investments. www.aldareinvestments.com