rakeshpai/bitflipper.js

## bitflipper.js
var wifi = require("Wifi"),

  ledPin = D14,
  buttonPin = D0,

  ssid = "...",
  password = "...";

var led = (function() {
  var pulseIntervalHandle,
    startTime;

  return {
    on: function() {
      digitalWrite(ledPin, 1);
    },

    off: function() {
      digitalWrite(ledPin, 0);
    },

    startPulse: function() {
      if(pulseIntervalHandle) return;
      startTime = Date.now();
      pinMode(ledPin, "output");

      pulseIntervalHandle = setInterval(function() {
        var ledBrightness = Math.sin((Date.now() - startTime)/500);
        analogWrite(ledPin, Math.abs(ledBrightness), {forceSoft: true});
      }, 20);
    },

    stopPulse: function() {
      if(pulseIntervalHandle) {
        clearInterval(pulseIntervalHandle);
        pulseIntervalHandle = null; // Interestingly, Esprino expects you to do the right thing here.
      }
      pinMode(ledPin, "output");  // Not sure why this is needed, but it does the trick.
      digitalWrite(ledPin, 0);
    },

    terminalError: function() {
      setInterval(function() {
        digitalWrite(ledPin, !digitalRead(ledPin));
      }, 250);
    }
  };
})();

var flipARandomBit = (function() {
  var isFlipping = false,
    flipDuration = 3000,
    queue = [];

  return function(done) {
    if(typeof done == "function") queue.push(done);

    if(isFlipping) return;

    isFlipping = true;
    led.startPulse();
    console.log("Flipping a bit...");

    setTimeout(function() {
      led.stopPulse();

      var ledState = Math.random()<0.5;
      ledState?led.on():led.off();
      console.log("Flip result: ", ledState);

      var queueItem;
      while(queueItem = queue.pop()) {
        queueItem(ledState);
      }

      isFlipping = false;
    }, flipDuration);
  };
})();

function connectToWifi() {
  console.log("Connecting to " + ssid + "...");
  led.startPulse();
  wifi.connect(ssid, {password: password}, function(err) {
    led.stopPulse();

    if(err) {
      console.log("Couldn't connect to " + ssid);
      console.log(err);
      led.terminalError();
      return;
    }

    console.log("Connected to " + ssid + ". Starting an HTTP server.");

    setTimeout(function() {
      var server = require("http").createServer(handleRequests);
      server.listen(80);
    }, 1000);

    wifi.getIP(function(station) {
      console.log("My IP is " + station.ip);
    });
  });
  wifi.stopAP();
  wifi.setHostname("bitflipper");
}

function handleRequests(req, res) {
  console.log("Received request for " + req.url);

  if(req.url == "/") {
    res.writeHead(200, {
      "Access-Control-Allow-Origin": "*",
      "Content-type": "text/html"
    });
    res.write("<title>BitFlipper</title>");
    res.write("<style>.result,progress{height:30px}body{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#D6D7DC;font-family:Tahoma,Geneva,sans-serif}.centered{max-width:50%;text-align:center;background:rgba(255,255,255,.6);padding:30px}h1{color:#3A4E6E;font-size:4em;margin:0 0 20px}button{background:#03C03C;margin:0 0 25px;padding:15px 10px;width:180px;color:#fff;cursor:pointer;font-size:1.25em;border:0}progress{width:100%;display:none}</style>");
    res.write("<body><div class='centered'><h1>BitFlipper</h1><button>Flip A Bit</button><div class='result'><progress></progress><div id='result'></div></div></body>");
    res.write("<script>!function(){function e(e,t){var n=new XMLHttpRequest;n.open('get',e),n.addEventListener('load',function(){t(JSON.parse(n.responseText))}),n.send()}document.querySelector('button').addEventListener('click',function(){var t=document.querySelector('#result'),n=document.querySelector('progress');n.style.display='block',t.style.display='none',e('/flip',function(e){t.innerHTML='Result: <b>'+e.result.toString()+'</b>',n.style.display='none',t.style.display='block'})},!1)}();</script>");
    res.end();
    console.log("Responded with home page");
  } else if(req.url == "/flip") {
    flipARandomBit(function(result) {
      res.writeHead(200, {
        "Access-Control-Allow-Origin": "*",
        "Content-type": "application/json"
      });
      res.end(JSON.stringify({result: result}));
      console.log("Responded to /flip with JSON");
    });
  } else {
    res.writeHead(404, {"Content-type": "text/plain"});
    res.end("404 - Not Found");
    console.log("Responded to " + req.url + " with 404");
  }
}

E.on("init", function() {
  connectToWifi();
  setWatch(flipARandomBit, buttonPin, {repeat: true, edge: "falling"});
});
	var wifi = require("Wifi"),

	ledPin = D14,
	buttonPin = D0,

	ssid = "...",
	password = "...";

	var led = (function() {
	var pulseIntervalHandle,
	startTime;

	return {
	on: function() {
	digitalWrite(ledPin, 1);
	},

	off: function() {
	digitalWrite(ledPin, 0);
	},

	startPulse: function() {
	if(pulseIntervalHandle) return;
	startTime = Date.now();
	pinMode(ledPin, "output");

	pulseIntervalHandle = setInterval(function() {
	var ledBrightness = Math.sin((Date.now() - startTime)/500);
	analogWrite(ledPin, Math.abs(ledBrightness), {forceSoft: true});
	}, 20);
	},

	stopPulse: function() {
	if(pulseIntervalHandle) {
	clearInterval(pulseIntervalHandle);
	pulseIntervalHandle = null; // Interestingly, Esprino expects you to do the right thing here.
	}
	pinMode(ledPin, "output"); // Not sure why this is needed, but it does the trick.
	digitalWrite(ledPin, 0);
	},

	terminalError: function() {
	setInterval(function() {
	digitalWrite(ledPin, !digitalRead(ledPin));
	}, 250);
	}
	};
	})();

	var flipARandomBit = (function() {
	var isFlipping = false,
	flipDuration = 3000,
	queue = [];

	return function(done) {
	if(typeof done == "function") queue.push(done);

	if(isFlipping) return;

	isFlipping = true;
	led.startPulse();
	console.log("Flipping a bit...");

	setTimeout(function() {
	led.stopPulse();

	var ledState = Math.random()<0.5;
	ledState?led.on():led.off();
	console.log("Flip result: ", ledState);

	var queueItem;
	while(queueItem = queue.pop()) {
	queueItem(ledState);
	}

	isFlipping = false;
	}, flipDuration);
	};
	})();

	function connectToWifi() {
	console.log("Connecting to " + ssid + "...");
	led.startPulse();
	wifi.connect(ssid, {password: password}, function(err) {
	led.stopPulse();

	if(err) {
	console.log("Couldn't connect to " + ssid);
	console.log(err);
	led.terminalError();
	return;
	}

	console.log("Connected to " + ssid + ". Starting an HTTP server.");

	setTimeout(function() {
	var server = require("http").createServer(handleRequests);
	server.listen(80);
	}, 1000);

	wifi.getIP(function(station) {
	console.log("My IP is " + station.ip);
	});
	});
	wifi.stopAP();
	wifi.setHostname("bitflipper");
	}

	function handleRequests(req, res) {
	console.log("Received request for " + req.url);

	if(req.url == "/") {
	res.writeHead(200, {
	"Access-Control-Allow-Origin": "*",
	"Content-type": "text/html"
	});
	res.write("<title>BitFlipper</title>");
	res.write("<style>.result,progress{height:30px}body{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#D6D7DC;font-family:Tahoma,Geneva,sans-serif}.centered{max-width:50%;text-align:center;background:rgba(255,255,255,.6);padding:30px}h1{color:#3A4E6E;font-size:4em;margin:0 0 20px}button{background:#03C03C;margin:0 0 25px;padding:15px 10px;width:180px;color:#fff;cursor:pointer;font-size:1.25em;border:0}progress{width:100%;display:none}</style>");
	res.write("<body><div class='centered'><h1>BitFlipper</h1><button>Flip A Bit</button><div class='result'><progress></progress><div id='result'></div></div></body>");
	res.write("<script>!function(){function e(e,t){var n=new XMLHttpRequest;n.open('get',e),n.addEventListener('load',function(){t(JSON.parse(n.responseText))}),n.send()}document.querySelector('button').addEventListener('click',function(){var t=document.querySelector('#result'),n=document.querySelector('progress');n.style.display='block',t.style.display='none',e('/flip',function(e){t.innerHTML='Result: <b>'+e.result.toString()+'</b>',n.style.display='none',t.style.display='block'})},!1)}();</script>");
	res.end();
	console.log("Responded with home page");
	} else if(req.url == "/flip") {
	flipARandomBit(function(result) {
	res.writeHead(200, {
	"Access-Control-Allow-Origin": "*",
	"Content-type": "application/json"
	});
	res.end(JSON.stringify({result: result}));
	console.log("Responded to /flip with JSON");
	});
	} else {
	res.writeHead(404, {"Content-type": "text/plain"});
	res.end("404 - Not Found");
	console.log("Responded to " + req.url + " with 404");
	}
	}

	E.on("init", function() {
	connectToWifi();
	setWatch(flipARandomBit, buttonPin, {repeat: true, edge: "falling"});
	});