math of acs712

acs712

http://www.mpja.com/download/ACS712.pdf

<div>vcc <input id="vcc" value="5" /></div>
<div>vout <input id="vout"  value="4.5" /></div>
<div>result <input id="va"/></div>



<script>
var vcc =  document.id('vcc');
var vout =  document.id('vout');
var vat =  document.id('va');

function acs712(vcc, vout, step){
    if(!step){
        step = 6.66666666667;
    }
    var result =((vout - (vcc/2))/ step)*100;
    return result;// Math.round(result);
}


vout.addEvent('keyup',function(){
  vat.value = acs712(parseFloat(vcc.value) ,parseFloat(vout.value) )
});

</script>