Example Code for Intel Joule-Analog Read

Hardware Preparation

Find the "Gravity:Analog Rotation Potentiometer Sensor V1 For Arduino" module in the "Gravity Sensor kit for Intel Joule" and connect to Analog pin 0 as the hardware connection showed above.

Software Preparation

Refer to Blink a LED example for software preparation. For this demo, we assume that you have successfully finished the blink demo above.

Wiring Diagram

Sample Code

Run the following code to get the analog result. JS+MRAA check version, I2C read ADS1115 A0 analog value periodically

var mraa = require('mraa');
var version = mraa.getVersion();

if (version >= 'v0.6.1') {
    console.log('mraa version ('   version   ') ok');
}
else {
    console.log('mraa version('   version   ') is old - this code may not work')
}

var ads1115 = new mraa.I2c(0);

//A0~A3
ads1115.address(0x48)

//A4~A7
// ads1115.address(0x49)

setInterval(function(){
//A0 if i2c address is 0x48
//A4 if i2c address is 0x49
    ads1115.writeWordReg(1, 0x83C1);

//A1 if i2c address is 0x48
//A5 if i2c address is 0x49
//    ads1115.writeWordReg(1, 0x83D1);

//A2 if i2c address is 0x48
//A6 if i2c address is 0x49
//    ads1115.writeWordReg(1, 0x83E1);

//A3 if i2c address is 0x48
//A7 if i2c address is 0x49
//    ads1115.writeWordReg(1, 0x83F1);

    var raw = ads1115.readWordReg(0);
    var analogValue = ((raw&0xff00)>>8) ((raw&0x00ff)<<8);

    console.log(analogValue);
}, 200);

Result

Print MRAA version state, output ADS1115 A0 value every 200ms.