known as crosstalk). One of the first commercially available range finding systems using ultrasonic pulses was introduced by Polaroid in the '80s, developed for automatic camera focusing. Another company which offers a full line of ultrasonic ranging systems with maximum detection ranges from 60 to 900 cm is Massa Products Corp. The HC-SR04 ultrasonic range finder is very simple to use, however the signal it outputs needs to be converted from 5V to 3.3V so as not to damage In previous tutorials we've outlined temperature sensing, PIR motion controllers and buttons and switches, all of which can plug directly into the Raspberry Pi's GPIO ports.

Jul 13, 2005 · Re: How to implement an I2C into 8051 using Assembly Languag I am currently on my Final Year Project named the Ultra Sonic Range Finder(SRF08). The project... The report details the implementation of distance measurement system using the ultrasonic waves. As the human ear’s audible perception range is 20 Hz to 40 kHz, it is insensitive to ultrasonic waves, and hence the ultrasound waves can be used for applications in industries/vehicles without hindering human activity.