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Permalink Reply by Patrice Mainville on January 19, 2011 at 7:12am

suppose too, but, I don't know, have one also, but not tried it, so, want to be notified of what it will be told here :)

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Permalink Reply by Florin Mingireanu on January 19, 2011 at 2:50pm

It seems to be compatible with GPS module EM-411/406A.

 

Now question: Do I need to put GPS module EM-411/406A in NMEA mode or the Ardupilot takes care of the GPS module configuration...?

 

Thanks!

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ModeratorPermalink Reply by Ken on January 19, 2011 at 5:20pm

Unless the function has been removed in recent libraries, the IMU software will command the 406 into SiRF binary communication, not NMEA. Binary is your preferred mode in the IMU software.

 

If you wish to use NMEA, set NMEA in the IMU software. But the last time I looked at it (6 months?) the baud rate set for NMEA was wrong for the 406 power up defaults. You may need to go through and check that. I might be thinking ArduPilot, not the IMU. 

 

One of the newer code lines I was looking at (IMU? APM?) I was glad to see that the programmers had separated the data rate setting from the GPS setting to make it easier to adapt.

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Permalink Reply by Florin Mingireanu on January 20, 2011 at 6:00am

Hi!

 

I connected the GPS EM-406A to the ArduIMU. I was using ArduIMU withj software version 1.8.2 and Ardupilot with software version 2.7. I was also using an Ardushield Version 2.

 

I modified the parameters in ArduIMU to expect GPS EM-406A and to print binary...

I also modified parameters in Ardupilot code to expect ArduIMU.

 

I powered everything up... ArduIMU did the callibrations at the beginning and then yellow LED was ON while blue LED was blinking. The blue LED on ArduPilot was also blinking but at a faster rate.

 

After 1 hour of keeping this entire system outdoors I still didn't get any GPS lock.

 

Are there any known incompatibilities between GPS EM-406A and ArduIMU/Ardupilot?

 

Note: the RED led on GPS EM-406A was dimmed. It was red but very very very dim. I understand that this means that the GPS module was working in binary mode. Is this correct?

 

Thanks!

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Permalink Reply by Florin Mingireanu on January 20, 2011 at 10:53am

Hi there,

 

More updates regarding this problem (it starts to piss me off!):

 

I use ArduIMU, Ardupilot and Ardushield V2.

I use the latest Ardupilot software version and ArduIMU software version 1.8.1

I get solid blue light on LED on ArduIMU but Ardupilot blue LED is still blinking...

I get full manual control but no STABILIZATION. Somehow it seems Ardupilot doesn't get the GPS lock from the ArduIMU...

I checked the settings in software and I have the right settings for the Ardupilot code (I told it to expect ArduIMU input) and I also told ArduIMU to expect GPS EM-406A...

I checked connections and they are per manual!

 

What else to check?

 

Best regards

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Permalink Reply by Florin Mingireanu on January 21, 2011 at 12:08am

Ken,

 

What portion in Ardupilot code and ArduIMU code has to be changed in order to make them communicate at the same baudrate?

 

Thanks!

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