Devantech SRF05 Ultrasonic Rangefinder
A very low cost ultrasonic rangefinder for measuring distances between 1cm and 4m.
The SRF05 requires a short 10us pulse to the trigger input to start ranging. The module then sends out an 8 cycle burst of ultrasound at 40KHz and raises its echo line high. It then listens for an echo, and as soon as it detects one it lowers the echo line again. The echo line is therefore a pulse whose width is proportional to the distance to the object. By timing this pulse with your controller it is possible to calculate the range.
Examples of using the SRF05 module with a wide range of popular controllers may be found here.
|Modes||Single pin for trigger/echo or 2 pin SRF04 compatible|
|Input Trigger||10us minimum TTL level pulse|
|Echo Pulse||Positive TTL level signal, width proportional to range|
|Dimensions||43mm x 20mm x 17mm height|