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A Simple Web Socket Demo that displays current temperature from a Raspberry pi's GPIO pins using a temperature sensor. Needs: Rashberry Pi, temperature probe, python 2.7, Tornado Webserver
1) Read This: http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/temperature/
2) Install tornado Webserver
3) Change the ws address in html file to the lo…
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| import time | |
| import tornado.httpserver | |
| import tornado.websocket | |
| import tornado.ioloop | |
| from tornado.ioloop import PeriodicCallback | |
| import tornado.web | |
| class WSHandler(tornado.websocket.WebSocketHandler): | |
| def open(self): | |
| self.callback = PeriodicCallback(self.send_temp, 120) | |
| self.callback.start() | |
| def send_hello(self): | |
| self.write_message('hello') | |
| def on_message(self, message): | |
| pass | |
| def on_close(self): | |
| self.callback.stop() | |
| print "Closed Connection" | |
| def send_temp(self): | |
| #Change this to the file of your temp probe! | |
| tfile = open("/sys/bus/w1/devices/28-000004acc08b/w1_slave") | |
| text = tfile.read() | |
| tfile.close() | |
| temperaturedata = text.split("\n")[1].split(" ")[9] | |
| temperature = float(temperaturedata[2:]) | |
| temperature = temperature / 1000 * 9 / 5 + 32 | |
| self.write_message("Current Temperature: {0:.2f}F".format(temperature)) | |
| print temperature | |
| time.sleep(1) | |
| application = tornado.web.Application([(r'/', WSHandler),]) | |
| if __name__ == "__main__": | |
| http_server = tornado.httpserver.HTTPServer(application) | |
| http_server.listen(9999) | |
| tornado.ioloop.IOLoop.instance().start() | |
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| <!-- | |
| /* | |
| * ---------------------------------------------------------------------------- | |
| * "THE BEER-WARE LICENSE" (Revision 42): | |
| * <[email protected]> wrote this file. As long as you retain this notice you | |
| * can do whatever you want with this stuff. If we meet some day, and you think | |
| * this stuff is worth it, you can buy me a beer in return Joseph Livecchi | |
| * ---------------------------------------------------------------------------- | |
| */ | |
| --> | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, user-scalable=no" /> | |
| <title>BlenderWebController</title> | |
| <script type="text/javascript" src="http://code.jquery.com/jquery-2.0.3.min.js"></script> | |
| <script type="text/javascript" src="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script> | |
| <link href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet" type="text/css" /> | |
| <script> | |
| //Change this to the locla ip of your pi | |
| var address = "ws://192.168.1.200:9999/" | |
| $(document).ready(function(){ | |
| try { | |
| var s = new WebSocket(address); | |
| s.onopen = function (e) { | |
| $("#Status").slideUp(); | |
| }; | |
| s.onclose = function (e) { | |
| $("#Status > div > p").text("Not Connected"); | |
| $("#Status").slideDown(); | |
| }; | |
| s.onmessage = function (e) { | |
| $("#templog > li").removeClass("hightlight"); | |
| $("#templog").prepend('<li class="list-group-item hightlight"></li>'); | |
| $("#templog > li").first() | |
| .hide() | |
| .text( e.data + ' @ ' + (new Date()).toLocaleTimeString() ) | |
| .slideDown("slow"); | |
| }; | |
| s.onerror = function (e) { | |
| $("#Status > div > p").text("Something Died!"); | |
| $("#Status").slideDown(); | |
| }; | |
| } catch (ex) { | |
| $("#Status > div > p").text("Something Died!"); | |
| $("#Status").slideDown(); | |
| } | |
| $("#close").click( function () { | |
| s.close(1000, "Try to Close"); | |
| }); | |
| }); | |
| </script> | |
| <style> | |
| .hightlight{ | |
| font-size: 2em; | |
| font-weight: bold; | |
| color: rgb(138, 109, 59); | |
| background-color: rgb(252, 248, 227); | |
| border-color: rgb(250, 235, 204); | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <div class="row" id="Status"> | |
| <div class="alert alert-warning"> | |
| <strong>Warning</strong><p></p> | |
| </div> | |
| </div> | |
| <div class="row"> | |
| <div class="panel panel-primary"> | |
| <div class="panel-heading" > | |
| <h2 class="panel-title" style="display:inline;font-size:160%;" >Temperature Log</h2> | |
| <button class="btn btn-warning" type="button" id="close" style="display:inline;float:right;">Close</button> | |
| </div> | |
| <div class="panel-body"> | |
| <ul id="templog" class="list-group"> | |
| </ul> | |
| </div> | |
| </div> | |
| </div> | |
| </div> | |
| </body> | |
| </html> |
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