http://nodna.de/Devantech-SRF05-Ultrasonic-Range-Finder http://nodna.de/Devantech-SRF04-Ultrasonic-Range-Finder
"The SRF05 is an evolutionary step from the SRF04, and has been designed to increase flexibility, increase range, and to reduce costs still further. As such, the SRF05 is fully compatible with the SRF04. Range is increased from 3 meters to 4 meters. A new operating mode (tying the mode pin to ground) allows the SRF05 to use a single pin for both trigger and echo, thereby saving valuable pins on your controller" Кроме того, пятый кушает меньше тока.
