This is the low-cost successor to the extremely popular SRF04 detector. The design for manufacturing has allowed the price to come down with better features including an LED status indicator that blinks when the sonar fires as well as a new single-wire mode of operation. In most all other respects, this is a drop-in equivalent of the SRF04. The range has also increased to 4 meters.
For further range see the SRF08. The SRF05 is interfaced using the one output line to ping the sensor and an input line to read the echo. The sensor can also be run using a single IO line.
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".
This is the SRF04 Ultrasonic ranger made by Devantech. The Ultrasonic detector can detect from ~4 inches to ~10 feet.
Autonomous patrol and security platform. Options for object detection, automated pathing, indoor/outdoor functionality are available.
This is an Enclosed 4-wheel drive remote control robot kit. It uses four powerful wheelchair motors and the inside robot cavity has plenty of room for electronics.