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Devantech SRF02 Small Ultrasonic Range Finder


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The SRF02 is a single transducer ultrasonic rangefinder in a small footprint PCB. It features both an I2C and a Serial interface. The serial interface is a standard TTL level UART format at 9600 baud, 1 start, 2 stop and no parity bits, and may be connected directly to the serial ports on any microcontroller. Up to 16 SRF02's may be connected together on a single bus, either I2C or Serial.

New commands in the SRF02 include the ability to send an ultrasonic burst on its own without a reception cycle, and the ability to perform a reception cycle without the preceding burst. Because the SRF02 uses a single transducer for both transmission and reception, the minimum range is higher than our other dual transducer rangers. The minimum measurement range is around 15cm (6 inches). The SRF02 can output measurements in microseconds, centimeters or inches.

This is the lowest cost ultrasonic ranger having both I2C and Serial interfaces. New AutoTune algorithms intelligently back the minimum range right up to the transducer ringdown for the very best performance possible, automatically, in the background, and with no calibration cycles necessary. Additional new commands allow for separate burst and ranging control.

This item can be connected directly to a USB port on your computer using the optional USB to I2C Interface Module.

This product is made by Devantech. More information, applications, and code samples may be found on their web site.

In Stock


Voltage: 5V only Required
Current: 4 mA Typical!
Frequency: 40 KHz
Maximum Range: 6 meters (~20 ft.)
Minimum Range: 15 cm (~6")
Analogue Gain: Automatic 64 step gain control
Connection Modes: 1) Standard I2C Bus.
2) Serial Bus - connects up to 16 devices to any uP or UART serial port
Full Automatic Tuning: No calibration, just power up and go
Timing: Fully timed echo, freeing host controller of task.
Units: Range reported in uS, mm or inches.
Size: 0.94 x 0.79 x 0.67 in.
24 x 20 x 17 mm
Light Weight: 4.6 grams