Still no GPS lock on Ardupilot:GPS lock on IMU

I have spent most of the day today going back to square one checkingeverything from solder joints and wiring, to checking code options andreloading all code on the Ardupilot and the ArduIMU+ V2.

The following is a summary of what I have and what has been checked:

Ardupilot board 01-12-09 code v 2.6
Ardupilot shield V2 10-10-09 n/a
ArduIMU+ V2 (flat) ----- code v 1.6
ublox LEA-5H ----- firmware v 6.02

Checked all solder joints the only header I couldn't get continuity onwas between the shield and the Ardupilot board (RXI to correspondinglocation on shield) I read on a different post that this was possiblydue to the multiplexer? The jumper wires on the back of the Ardupilotboard test ok, MUX to pin D8 and ch3 signal in to pin D13.

On the Ardupilot I uploaded code v 2.6
the Ardupilot header file ap_2_6_header.h has the following settings:

//HARDWARE CONFIGURATION
//0-1
#define SHIELD_VERSION 1
//0-2
#define AIRSPEED_SENSOR 1
//0-3
#define GPS_PROTOCOL 3

On the ArduIMU+ V2 I uploaded the code again v 1.6 after making thefollowing changes or checks:

#define BOARD_VERSION 2

#define GPS_PROTOCOL 1

#define ENABLE_AIR_START 1

#define GROUNDSTART_PIN 8

#define SPEEDFILT 2

#define PRINT_DEBUG 0

#define OUTPUTMODE 1

#define PRINT_DCM 0
#define PRINT_ANALOGS 0
#define PRINT_EULER 1
#define PRINT_GPS 1

#define PRINT_BINARY 1)

#define PERFORMANCE_REPORTING 1

#define USE_MAGNETOMETER 0

After making or checking these settings I uploaded the code to eachboard, reassembled the system as shown in the pictures and went outsideto check the results. I didn't see any change in the LED behavior. Theblue GPS lock light on the IMU remains steady after the initial startup, while the Ardupilot board and the Shield have a blinking blue light.I think I've covered the bases but I can't help feeling I'm missingsomething simple. Please check the attached pictures to make sure I haveeverything wired and assembled correctly. Any suggestions you havewould help.

Thanks again

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3D Robotics

Chris Anderson April 11, 2010 at 7:37am

Nathaniel, I think that's normal. When you get the lock on the IMU, you've got it. I don't think the ArduPilot lock LED ever stops blinking when you're using the IMU. I haven't checked in the last week or so, but that's the way it was in the last rev.

(Needless to say, we should probably make the ArduPilot LED mirror the IMU LED, but that's just cosmetic. The autopilot should be working fine once you've got the lock on the IMU)

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Still no GPS lock on Ardupilot:GPS lock on IMU

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