This great sonar ranger from Devantech offers a wide range from 3cm to 3m. For further range see the SRF08. The SRF04 is interfaced using the one output line to ping the sensor and an input line to read the echo.
This is the SRF05 Ultrasonic ranger made by Devantech. The Ultrasonic detector can detect from ~4 inches to ~13 feet.
The MaxBotix low voltage MB1010 LV-MaxSonar-EZ1 offers very short to long-range detection and ranging, in an incredibly small package with ultra low power consumption. The MaxSonar-EZ1 detects objects from 0" to 254".
The DXe is the affordable way to equip your sport plane or trainer with the speed, and reliability of DSMX control. Of course it works great for robots too!
This robot uses custom length sides and 10" traction lug tires with IG52 136 RPM motors. We have included everything to make it ready to run including batteries, chargers, and a controller.