Intel Edison node.js sample code not working with grove 3-axis digital I2C accelerometer

Question

This is the sample code from Intel for running an accelerometer (Grove digital):

// Load accelerometer
var adxl345 = require('jsupm_adxl345');

// Instantiate on I2C bus
var adxl = new adxl345.Adxl345(0);

setInterval(function()
{
    adxl.update(); // Update the data
    var raw = adxl.getRawValues(); // Read raw sensor data
    var force = adxl.getAcceleration(); // Read acceleration force (g)
    var rawvalues = raw.getitem(0) + " " + raw.getitem(1) + " " + raw.getitem(2);
    console.log("Raw Values: " + rawvalues);
    console.log("ForceX: " + force.getitem(0).toFixed(2) + " g");
    console.log("ForceY: " + force.getitem(1).toFixed(2) + " g");
    console.log("ForceZ: " + force.getitem(2).toFixed(2) + " g");
}, 1000);

It builds and uploads to the Edison Arduino board, but when running it throws this error:

ERROR: /home/root/.node_app_slot/main.js:10                                                                                                                                             
ERROR: var adxl = new adxl345.Adxl345(0);                                                                                                                                               
   ERROR:         ^                                                                                                                                                                     
ERROR: Error: UPM Runtime Error: Adxl345: i2c.write() control register failed                                                                                                           
    at Object.<anonymous> (/home/root/.node_app_slot/main.js:10:12)                                                                                                                     
    at Module._compile (module.js:456:26)                                                                                                                                               
    at Object.Module._extensions..js (module.js:474:10)                                                                                                                                 
    at Module.load (module.js:356:32)                                                                                                                                                   
    at Function.Module._load (module.js:312:12)                                                                                                                                         
    at Function.Module.runMain (module.js:497:10)                                                                                                                                       
    at startup (node.js:119:16)                                                                                                                                                         
    at node.js:935:3

Any thoughts as to what's wrong there? The accelerometer is connected to an I2C port. Another sensor (temperature) is working ok.

Are you sure that is the sensor type you have? I believe the normal grove one that gets sent out is the mma7660 part: https://github.com/intel-iot-devkit/upm/blob/master/examples/javascript/mma7660.js (I'm not seeing your error, but I am getting bogus values when I run the adxl345 code). — Whitney, Oct 30 '15 at 18:05
Also when you type 'configure_edison --version' into a serial connection what do you get? I'm on 159 currently. — Whitney, Oct 30 '15 at 18:10

score 0 · Answer 1 · answered Jul 18 '16 at 08:14

The grove acceleremoter is not the ADXL345 but the MMA7660 as explained here.

And below is the upm code for the MMA7660

 var digitalAccelerometer = require('jsupm_mma7660');
    // Instantiate an MMA7660 on I2C bus 0
    var myDigitalAccelerometer = new digitalAccelerometer.MMA7660(
                    digitalAccelerometer.MMA7660_I2C_BUS, 
                    digitalAccelerometer.MMA7660_DEFAULT_I2C_ADDR);

    // place device in standby mode so we can write registers
    myDigitalAccelerometer.setModeStandby();

    // enable 64 samples per second
    myDigitalAccelerometer.setSampleRate(digitalAccelerometer.MMA7660.AUTOSLEEP_64);

// place device into active mode
myDigitalAccelerometer.setModeActive();

var x, y, z;
x = digitalAccelerometer.new_intp();
y = digitalAccelerometer.new_intp();
z = digitalAccelerometer.new_intp();

var ax, ay, az;
ax = digitalAccelerometer.new_floatp();
ay = digitalAccelerometer.new_floatp();
az = digitalAccelerometer.new_floatp();

var outputStr;

var myInterval = setInterval(function()
{
    myDigitalAccelerometer.getRawValues(x, y, z);
    outputStr = "Raw values: x = " + digitalAccelerometer.intp_value(x) +
    " y = " + digitalAccelerometer.intp_value(y) +
    " z = " + digitalAccelerometer.intp_value(z);
    console.log(outputStr);

    myDigitalAccelerometer.getAcceleration(ax, ay, az);
    outputStr = "Acceleration: x = " 
        + roundNum(digitalAccelerometer.floatp_value(ax), 6)
        + "g y = " + roundNum(digitalAccelerometer.floatp_value(ay), 6) 
        + "g z = " + roundNum(digitalAccelerometer.floatp_value(az), 6) + "g";
    console.log(outputStr);
}, 500);

// round off output to match C example, which has 6 decimal places
function roundNum(num, decimalPlaces)
{
    var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
    return (Math.round((num + extraNum) 
        * (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
}

// When exiting: clear interval and print message
process.on('SIGINT', function()
{
    clearInterval(myInterval);

    // clean up memory
    digitalAccelerometer.delete_intp(x);
    digitalAccelerometer.delete_intp(y);
    digitalAccelerometer.delete_intp(z);

    digitalAccelerometer.delete_floatp(ax);
    digitalAccelerometer.delete_floatp(ay);
    digitalAccelerometer.delete_floatp(az);

    myDigitalAccelerometer.setModeStandby();

    console.log("Exiting...");
    process.exit(0);
});

Intel Edison node.js sample code not working with grove 3-axis digital I2C accelerometer

1 Answers1