adc.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(0x48)

setInterval(function(){
//A0
    ads1115.writeWordReg(1, 0x83C1);

//A1
//    ads1115.writeWordReg(1, 0x83D1);

//A2
//    ads1115.writeWordReg(1, 0x83E1);

//A3                                  
//    ads1115.writeWordReg(1, 0x83F1);
                                      
    var raw = ads1115.readWordReg(0); 
    var analogValue = ((raw&0xff00)>>8)+((raw&0x00ff)<<8);
                                                          
    console.log(analogValue);                             
}, 200);