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Anyone using SRF08 ranger on address other then 0xF8?

asked 2013-03-29 15:18:01 -0500

KM6VV gravatar image

updated 2014-01-28 17:15:58 -0500

ngrennan gravatar image

I've got a single SRF08 ranger running on the supplied 0xF8 address, but I can't get it to work on the other addresses (I need several sensors). I have verified the ranger to be addressed to 0xE8, but the ranger does not reply to either the programmed address 0xE8, or the +4 address the author uses for subsequent calls.

The author suggests:

New_Address += 4; // offset address not sure why this is but it works for this address

http://www.ros.org/wiki/rosserial_arduino/Tutorials/SRF08%20Ultrasonic%20Range%20Finder

I have implemented a multi-ranger program in the past (on a 2620 PIC), and I didn't need to do any "+4" trick to get it working. It also worked on all six addresses. I have not yet "ported" my my code to the Atmel (I wanted to use the Sonar_srf08 library).

There is a newer version of the library, but it's essentially the same, just added gain and range parameters to several wire.writes.

http://playground.arduino.cc/Main/SonarSrf08

Any ideas or fixes?

Thanks, Alan

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answered 2013-03-30 08:05:39 -0500

KM6VV gravatar image

updated 2013-03-30 08:06:46 -0500

I fixed the problem. The SonarSRF08 library did not shift the I2C address right by one, so the addresses sent to Wire were wrong.

Wire.beginTransmission(address/2); Wire.requestFrom(address/2, numBytes);

Now the +4 added to the address in the example (calling program) is not needed. I have now added code to cycle through my three SRF08 Sonar modules.

Alan

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Asked: 2013-03-29 15:18:01 -0500

Seen: 211 times

Last updated: Mar 30 '13