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ArduPilot Mega Shield accelerometer help!

Posted by Ricardo Madera on July 14, 2010 at 7:16am
Hello,

So i have spent some time programming with the ArdupilotMega + Shield combo and i just realized that my Accelerometer does not read all 3 axis. Using the APM_ADC test code, channel 3 always posts a steady 1550-1552 reading. Im not sure what is going one.
Although this is not posted anywhere this is what i have assumed based on all the code i have seen for the APM shield.

Gyros = channels 0,1,2
Accel = channels 3,4,5
Pressure = channel 6? 

Is this correct? Channel 6 also produces a steady almost unchanging signal.
Or is my shield defective?

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Tags: apm_adc, ardupilot, imu, mega, oilpan, shield
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  • Admin
    Thomas J Coyle III July 14, 2010 at 7:29am
    Ricardo,

    Here is what I believe to be the correct ADC channels on the latest version of the IMU Mega:

    Serial.print(APM_ADC.Ch(4)); //X-Acel
    Serial.print(",");
    Serial.print(APM_ADC.Ch(5)); //Y-Acel
    Serial.print(",");
    Serial.print(APM_ADC.Ch(6)); //Z-Acel
    Serial.print(",");
    Serial.print(APM_ADC.Ch(2)); //X-Gyro
    Serial.print(",");
    Serial.print(APM_ADC.Ch(1)); //Y-Gyro
    Serial.print(",");
    Serial.print(APM_ADC.Ch(0)); //Z-Gyro
    Serial.print(",");
    Serial.print(APM_ADC.Ch(3)); //Temp
    Serial.print(",");
    Serial.print(APM_ADC.Ch(7)); //Aux

    Channel three, being the temperature, will show what you are reading. I get similar values.

    Hope this helps.

    Regards,
    TCIII
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