Devantech SRF04 Ultrasonic Ranger

Back to Products
Devantech SRF04 $22.00 sonar ultrasonic ranger Robot Electronics


Product Details

There are a couple of requirements for the input trigger and output pulse generated by the ranger.  The input line should be held low (logic 0) and then brought high for a minimum of 10 microseconds.  The pulse is generated on the falling edge of the input trigger. The ranger's receive circuitry is held in a short blanking interval of 100 microseconds to avoid noise from the initial ping and then it is enabled to listen for the echo.  The echo line is low until the receive circuitry is enabled.  Once the receive circuitry is enabled, the falling edge of the echo line signals either an echo detection or the timeout (if no object echo is detected).


Current30mA typcially 50mA maximum
Min Range3cm (1.18in)
Max Range3m (9.84ft)
Input Trigger10┬ÁS minimum, TTL level pulse
Echo PulsePositive TTL level signal, proportional to range
Weight11.33gm (0.4oz)
SensitivityDetect a 3cm (1.18in) diameter stick at > 2m (6.56ft)
Connection TypeDigital

Product Assets

Name Notes File
R93-SRF04.igs 3D IGES CAD Model Download
Product Information Technical Documentation