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Devantech SRF04 Ultrasonic Rangefinder

A low cost ultrasonic rangefinder for measuring distances between 3cm and 3m.

The SRF04 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.

Please note that unlike the SRF10 and SRF08 ultrasonic rangefinders the SRF04 does not support I2C communications.

Examples of using the SRF04 module with a wide range of popular controllers may be found here.


Pricing

Technical Details

Voltage 5V
Current 30mA typical 50mA maximum
Frequency 40KHz
Range 3cm-3m
Sensitivity Detects 3cm diameter broom handle at > 2m
Input Trigger 10us minimum TTL level pulse
Echo Pulse Positive TTL level signal, width proportional to range
Dimensions 43mm x 20mm x 17mm height

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Page Updated:
17/03/2020

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Warburton Technology (UK), 33 Selkirk Close, Wimborne, Dorset, BH21 1TN, United Kingdom
VAT Number: GB 846 917 877