Arduimu as a standalone attitude sensor and telemetry.

Hi all,

I have done an experiment today ,very simple but enough for my lack of programming skills.Thanks Armiche.

I was unable to make a wireless connection between arduimu and his test software ,it works perfectly with the ftdi adapter.

There is something in the code that ask the IMU via ftdi if its connected or something because the x-ctu terminal shows the messages being received,but the test software does not run.

"The solution"

I tried with the razor IMU with Jose´s Python software and it works!!! (with mod#2). To use the arduimu I did #1.

Mod #1 Change the output.pde ,the one in the razor folder goes to the arduimu´s one. Try to compile and then comment the line that shows a problem ,something about "performance report" .I will post it ,this is another computer. Upload to arduimu.

Mod#2 edit the Python app. with the COM port you are using with the Xbee and his baud rate ,I set both at 38400 bauds.

Of course the "airboirne" xbee needs a 5 to 3,3 regulator ,be carefull.

Hope you found it usefull for experiments.

Next we are going to connect arduimu to paparazzi via spi ......

Juan Martin

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Comments

Kraig Krumm December 13, 2010 at 5:27am

Ya, I was starting to doubt my sanity! :-) Should have done more research on Sparkfuns website. They have added a note on the shield board page now about this issue.
Juan Enrique Martin Boix December 11, 2010 at 3:49am

Finally !!!
Kraig Krumm December 10, 2010 at 10:45am

OK, found problem was the diode in the DIN line. Bypassed with 120K 1/8watt resistor and data was perfect. Sparkfun has some info on this but not on page where xbee shield is.
Juan Enrique Martin Boix November 22, 2010 at 12:37am

Have you tried a wired connection first ? That way it´s easier to try different baud rates. Mismatching baud rates are number one failure .
What arduino soft are you using?
Kraig Krumm November 19, 2010 at 11:09am

Ok, many weeks later, I split the power supply and made sure both xbees and the IMU and computer were set to 57600 baud. The two xbees are talking but the data is not usable. almost all showing as 00 in the hex window. Can't figure out where I am going wrong. If I power down the IMU the data flow stops so i know the xbees are talking.
Juan Enrique Martin Boix October 19, 2010 at 7:39am

Please let me know ,I run from a battery and the xbee from a custom regulator LM2937ET.
Kraig Krumm October 19, 2010 at 5:57am

Yep, and I did that. It works fine. I think the problem may be that I was trying to run both the IMU and the xbee off of the regulator on the IMU board. I noticed it was running warm so I am in the process of splitting the power source. Perhaps the load was to much and the logic level was not consistent?!? I'll let you know how the split power supply works out.
Juan Enrique Martin Boix October 19, 2010 at 5:52am

It seems that the connection is ok ,Can you try first a wired connection using the Python app.???
Kraig Krumm October 15, 2010 at 12:32pm

Can anyone tell me how to connect the 9d0f IMU running the SF9DOF_AHRS software directly too an XBEE. I have tried using the xbee shield using the following connections:

IMU XBEE
DTR ---------> DTR
TX0 ---------> DIN
RX1 ---------> DOUT
3.3V ---------> 3.3V
CTS ---------> CTS
GND---------> GND

The other XBEE is connected to the computer using the SF USB XBEE shield.
I am getting a connection, but no data. Thank You for your input.

Kraig
Canton, OH USA
Juan Enrique Martin Boix June 17, 2010 at 8:50am

A ke si!!!! Pampero forever.

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