About using LED sensor to depict result of proximity sensor

1

I am using this code to light the LED depending upon signals from proximity sensor . Please help.

BOLT

Sensor data

Read Sensor on PIN-4
if (output == 0 ) {} else {}
2

Are you using bolt or ARDUINO cause the program
u use are not of HTML but of ARDUINO IDE

3

this is a very quick and dirty method of doing this but it works
oh and theres a nice 3 second delay before you can see an effect

 <!doctype html>
        <html>
        <head>
        <title>BOLT</title>
        <script type="text/javascript" src="/serveFile?filename=bolt.js"> setDebug(true);  </script>	
        <script>

            var output;
            var sensor_output;
            var sensor_output_array;
            var sensor_val;

            function start(){
        //the format of the digital or analog read provided in bolt.js is "Pin Value=x"
    // so instead of just writing my own ajax request or editing the js file like a normal person
    // i decided to do it like coz i was lazy
                digitalRead(3,"hidden");
                sensor_output= document.getElementById("hidden").innerHTML;
                sensor_output_array = sensor_output.split("=");
                sensor_val=sensor_output_array[1];

                if(sensor_val==0){
                    document.getElementById("light").innerHTML ="something detected";
                    digitalWrite(5,HIGH);
                }
                else{
                    document.getElementById("light").innerHTML ="all clear";
                    digitalWrite(5,LOW);

                }
                
        document.getElementById("output").innerHTML =sensor_val;

        //anything less than 2.5 seconds causes alot of problems for me.
    // it hangs the board and i gotto restart it.
        //im assuming its because it take that long to handle one request but i might be wrong.
        //if anyone has a reason for this i would like to know
                setTimeout(start,3000);
        }


        </script>

        </head>
        <body bgcolor="#01FFFF" > 
        <center>
        <h3> Sensor data</h3>
        <span id="hidden" style="display: none"> </span>
        <span id="output"> </span>
        <p id="light"></p></center>
        <button onclick="start();">ON</button>
        </body> 
        </html>
4

You can either put this in your file or in the bolt.js file`

 function newDigitalRead(pin) {
        var xmlhttp = new XMLHttpRequest();
        xmlhttp.open("GET","/digitalRead?pin="+pin,true);
        xmlhttp.send();
        xmlhttp.onreadystatechange = function() {
            //document.getElementById(element_id).innerHTML = xmlhttp.responseText;
            if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                //document.getElementById("javascript_response").innerHTML = "Javascript Response : "+xmlhttp.responseText;
                var obj = JSON.parse(xmlhttp.responseText);
                if(obj.success=="1")
                {
                    console.log(obj.value);
                    newDigitalOutput=obj.value;
                }
                else{
                    newDigitalOutput=xmlhttp.responseText;
                }
            }
        };
    }`

To use it

 newDigitalRead(3);
 sensor_val=newDigitalOutput;
5

The easiest method is to use connect the +ve terminal of the LED to the output terminal of the proximity sensor.
So your setup might look like this:
LED -ve pin - ground LED +ve pin - 4 Prx output pin - 4