I am looking to build a car back up sensor. Basically make a beep with piezo buzzer if less than 4 inches left or display on the lcd the distance left between you and the other car. Have the sensor mounted near licence plate. My question is, I was thinking of using this, http://www.adafruit.com/index.php?main_page=product_info&cPath=35&products_id=164 is this a good tool for a job or should i stick with something like this: http://www.adafruit.com/index.php?main_page=product_info&cPath=35&products_id=172
If it will be mounted near my licence plate, what are the cone angles of the area it covers? Meanign how do i align it so that it senses objects. Is this one line/beam that it shoots out or like a sonar (depthfinder) cone angle?
Thanks for any feedback
Feedback is welcome.