Measure Biopotential / ECG using Python on the Android Smartphone

address.txt

http://www.smartphonedaq.com/android-python-ecg.page

droid = android.Android()
droid.webViewShow('file:///sdcard/sl4a/scripts/graph.html')

loop=True
while loop:
    e = droid.eventWaitFor('check').result
    if (e['data']=='timer'):
        ...
        # display results
        data={}
        data['hr']=shr
        data['wf']=format4Flot(reading)
        droid.eventPost("respond",json.dumps(data))
    else:
        droid.makeToast(e['data'])
        loop = not(e['data']=="quit")

graph.html
<script language="javascript" type="text/javascript" src="jquery.min.js"></script>
<script language="javascript" type="text/javascript" src="jquery.flot.min.js"></script>

<h1>ECG Graph</h1> 
<div>Heart Rate (BPM): <div id="ehr" style="display: inline;"/></div> 
<div id="egraph" style="width:300px;height:300px;"></div> 
<div> 
<button id="start" onClick='timerstart();'>Start</button> 
<button id="stop" onClick='timerstop();'>Stop</button> 
<button id="quit" onClick='quit();'>Quit</button> 
</div>

<script type="text/javascript">
var timerOn = 0;
var timerInterval = 2500;

var droid = new Android();
var display = function(result) {
    var json_data = eval("(" + result.data + ")");
    $.plot($("#egraph"), [json_data.wf]);
    document.getElementById("ehr").innerHTML = json_data.hr;
}

droid.registerCallback("respond", display);

function timerstart(){ 
    droid.eventPost("check", "timer"); 
    timerOn = setInterval(function() { droid.eventPost("check", "timer"); }, timerInterval);
}

function timerstop(){ clearInterval(timerOn); droid.eventPost("check", "stop"); } 

function quit(){ clearInterval(timerOn); droid.eventPost("check", "quit"); droid.dismiss();}
</script>