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EUR 14.98 EUR 12.59
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plus EUR 5.95 shipping costsplus EUR 5.00 shipping costs

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7 in stock
updated: 22.09.2017

RoHS

SRF02 - Low Cost, High Performance Ultrasonic Ranger

Devantech

Lowest cost ultrasonic ranger with 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.


Technical data

SRF02
Range 16 cm ... 6 m
Supply voltage 5V DC
Current (typical) 4 mA
Dimensions 24 x 20 x 17 mm
Weight 4.6 g
Units µs/mm/inch
Frequency 40 kHz
Interface I2C, seriell

Operating modes

There are two operating modes for the SRF02. I2C mode and Serial Mode. This is set with the Mode pin, connected to 0v Ground for Serial Mode and left unconnected (or tied to +5v Vcc) for I2C Mode. These are documented on individual pages.


Connections in I2C-Mode

DEV-SRF02-i2c.jpg


Connections in serial Mode

DEV-SRF02-serial.jpg


Connecting the SRF02 via USB

Connecting the SRF02 to your PC via USB is this easy. The USBI2C module supplies the SRF02 with power directly from the USB bus.

DEV-SRF02-usb.jpg


Beam Width

The manufacturers beam pattern, showing the sensitivity of the transducer in db.

DEV-SRF02-beam.gif

This is the measured beam pattern for the SRF02, showing the maximum detection range of a 55mm diameter plastic pipe.

DEV-SRF02-beam02.gif


Dimensions

DEV-SRF02-ed.gif


YouTube Videos


Accuracy

Devatech quotes 3-4cm. It is normally better than this, however so many factors affect accuracy that the manufacturer won't specify anything better than this. The speed of sound in air is approx. 346m/S at 24 degrees C. At 40KHz the wavelength is 8.65mm. The sonars detect the echo by listening for the returning wavefronts. This echo has an attack/decay envelope, which means it builds up to a peak then fades away. Depending on which wavefront is the 1st to be strong enough to be detected, which could be the 1st, 2nd or even 3rd, the result can jitter by this much. Another effect which limits accuracy is a phasing effect where the echo is not coming from a point source. Take a wall for example, the ping will bounce off the wall and return to the sonar. The wall is large, however, and there will be reflections from a large area, with reflections from the outside being slightly behind the central reflection. It is the sum of all reflections which the sensor sees which can be either strengthened or weakened by phasing effects. If the echo is weakened then it may be the following wavefront which is detected - resulting in 8.65mm of jitter. It is possible to see changes of distance as small as mm but then get cm of jitter.

Manufacturer's data

Technical Specification - link to the manufacturer
FAQ - link to the manufacturer


Customer feedback

Min max temperatures

Customer: "In the spec there is only the operational temperature of the ultrasonic sensor itself. What are the min and max temperatures to use the complete module?"

Manufacturer: "As far as the components are concerned, the temperature range of the SRF02 is –30°c to 70°c. However we do not test at those extremes. The SRF02 is designed to operate at ambient temperatures. The sonar¬ís use 20 degrees C as the ref point where the speed of sound is 343m/s. So if the temperature changes so will the speed of sound – and the reported range."


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Product information for: SRF02 - Low Cost, High Performance Ultrasonic Ranger

Publishing date (date of last technical specification): 2009-01-22
Weight: 4 g
Shipping weight: 160 g
Manufacturer: Devantech
Brand: ROBOT ELECTRONICS
Article number: DEV-SRF02
Manufacturer's part number: SRF02

The article SRF02 - Low Cost, High Performance Ultrasonic Ranger is listed in the following categories:

Sensors > Ultrasonic

SRF02 - Low Cost, High Performance Ultrasonic Ranger DEV-SRF02

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Order online now

EUR 14.98 EUR 12.59
Price incl. VAT Price excl. VAT
plus EUR 5.95 shipping costsplus EUR 5.00 shipping costs

Immediate delivery

Available for immediate delivery while stock lasts.

7 in stock
updated: 22.09.2017

Information on currency

EUR 14.98 = GBP 12.82 EUR 12.59 = GBP 10.77 (€1=GBP0.85570)
EUR 14.98 = USD 16.91 EUR 12.59 = USD 14.21 (€1=USD1.1290)
EUR 14.98 = CAD 21.87 EUR 12.59 = CAD 18.38 (€1=CAD1.4597)
EUR 14.98 = AUD 22.23 EUR 12.59 = AUD 18.68 (€1=AUD1.4840)

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