MPR121 module - how to know when an electrode is touched?

@bertjerred,

two (2) issues there:

• the .connect() arguments are not as expected - function object is expected - and
  
• malformed themselves - not a proper object, that's why the syntax complain: no object property can be named function, because of function being a reserved word.
  
  

The second argument of .connect() has to be a function() object and the code passes a malformed object { setInterval(... }.

Small change fixes this.

I2C1.setup({scl:B8,sda:B9});
I2C2.setup({scl:B10,sda:B11});
var mpr1;
var mpr2;
var lastKeyPressed = 0;
var lastBankSelected = 0;

function keyDev() {
  // device 1 (12-key musical keyboard) is ready
  setInterval(function() {
    var keys = mpr1.touched();
    if (keys!=lastKeyPressed){
      for (var i=0;i<12;i++){
        var kbit = 1<<i;
        if ((keys&kbit) && !(lastKeyPressed&kbit))
          // do something, for example:
          console.log("Key: " + i);
      }
    }
    lastKeyPressed = keys;
  }, 100);
};

funciton bankDev() {
  // device 2 (12-position rotary switch) is ready
  setInterval(function() {
    var banks = mpr2.touched();
    if (banks!=lastBankSelected){
      for (var j=0;j<12;j++){
        var bbit = 1<<j;
        if ((banks&bbit) && !(lastBankSelected&bbit))
          // do something, for example:
          console.log("Bank: " + j);
      }
    }
    lastBankSelected = banks;
  }, 100);
};

function onInit() {
  mpr1 = require("MPR121").connect(I2C1, keyDev);
  mpr2 = require("MPR121").connect(I2C2, bankDev);
}

setTimeout(onInit,999); // for dev; comment before save()

If you do not like the extra ('external', non-anonymous, named) keyDev(){...} and bankDev(){}...} functions, you can define them inline as anonymous, just like in the setInterval(function(){...},...); function:

I2C1.setup({scl:B8,sda:B9});
I2C2.setup({scl:B10,sda:B11});
var mpr1;
var mpr2;
var lastKeyPressed = 0;
var lastBankSelected = 0;

function onInit() {
  mpr1 = require("MPR121").connect(I2C1, function(){
    //device 1 (12-key musical keyboard) is ready
    setInterval(function() {
      var keys = mpr1.touched();
      if (keys!=lastKeyPressed){
        for (var i=0;i<12;i++){
          var kbit = 1<<i;
          if ((keys&kbit) && !(lastKeyPressed&kbit))
            //do something, for example:
            console.log("Key: " + i);
        }
      }
      lastKeyPressed = keys;
    }, 100);
  });

  mpr2 = require("MPR121").connect(I2C2, function() {
    //device 2 (12-position rotary switch) is ready
    setInterval(function() {
      var banks = mpr2.touched();
      if (banks!=lastBankSelected){
        for (var j=0;j<12;j++){
          var bbit = 1<<j;
          if ((banks&bbit) && !(lastBankSelected&bbit))
            //do something, for example:
            console.log("Bank: " + j);
        }
      }
      lastBankSelected = banks;
    }, 100);
  });
}

setTimeout(onInit,999); // for dev; comment before save()