adc2.js

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);
ads1115.address(0x49)

setInterval(function(){
//A4
    ads1115.writeWordReg(1, 0x83C1);

//A5
//    ads1115.writeWordReg(1, 0x83D1);

//A6
//    ads1115.writeWordReg(1, 0x83E1);

//A7
//    ads1115.writeWordReg(1, 0x83F1);

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

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