How to read motion sensor data using M4 Arduino?

I can't seem to get any data from the motion sensors when reading them via Arduino. I visited this page but the link is broken: http://www.udoo.org/docs-neo/Arduin...e_9-axis_motion_sensors_from_the_M4_Core.html

I initially (successfully) tested the sensors by checking the UDOO web dashboard and checked via console using:

echo 1 > /sensors/accelerometer/enable
cat /sensors/accelerometer/data

I then removed I2C bus 4 from external pins using the Device Tree Editor (as shown here: http://imgur.com/jHJ4axu). This resulted in UDOO's web dashboard NOT showing motion sensor data, and the /sensors/accelerometer directory disappearing.

I cloned https://github.com/UDOOboard/udooneo-arduino-libraries-release to ~/Arduino/libraries.

I uploaded the following simple sketch via the dashboard Arduino IDE:

#include <Wire.h>
#include <FXOS8700CQ_neo.h>

FXOS8700CQ accMagSensor = FXOS8700CQ(0x1E);

void setup() {

pinMode(13, OUTPUT)
Serial.begin(115200);
Wire1.begin();
accMagSensor.init();​

}

void loop() {

accMagSensor.readMagData();
Serial.print((int)accMagSensor.accelData.x);
Serial.print(", ");
digitalWrite(13, HIGH);
delay(100);
digitalWrite(13, LOW);
delay(100);​

}

The LED on the board blinks as expected, however when reading from serial using an onboard Linux Python script (also at 115200 baud) I just get comma separated zeroes: 0, 0, 0, 0, ...

Am I missing a step somewhere?

Using UDOO Neo Full.

 

The correct link is http://www.udoo.org/docs-neo/Arduino_M4_Processor/Controlling_9-axis_motion_sensors.html
Just a quick update on the instructions:
If you do
sudo apt-get update
sudo apt-get upgrade
Then you will get the latest arduino sketch and library update. You can open the examples from the Arduino IDE on the Neo by menu Open - Examples - (UDOO NEO and something). I have no Neo close by.

 

Thanks, I managed to get some numbers out although stability seems patchy. Which is the best library for the Neo Full?
FXOS8700CQ_neo from GitHub?
FXOS8700CQ_neo from apt-get?
FXOS8700CQ?

 

accMagSensor.readMagData();
doesn't read accelerometer data, so it's not surprising to get zeros after that.

You should use
accMagSensor.readAccelData();