This article illustrates how to control remotely via web a GPIO line using the Tornado web server for Python

To follow this article you have to install Tornado on your CORE9G25 Board.

The first attempt is to control a led wired on an CORE9G25 board.

The files used are:

Led controller

Led control panelONOFF

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import tornado.ioloop
import tornado.web
import ablib

class ledon(tornado.web.RequestHandler):
	def get(self):
		led.on() 
		print "Led ON"
		self.write("Led ON")

class ledoff(tornado.web.RequestHandler):
	def get(self):
		led.off() 
		print "Led OFF"
		self.write("Led OFF")

application = tornado.web.Application([
	(r"/ledon", ledon),
	(r"/ledoff", ledoff),
	(r"/(.*)", tornado.web.StaticFileHandler, {"path": ".","default_filename": "index.html"}),
])

if __name__ == "__main__":
	led = ablib.Daisy11('D11','L1')

	application.listen(8080,"0.0.0.0")
	tornado.ioloop.IOLoop.instance().start()

Go the CD://Debian/python/tornado/led/index.html to see the file details

The web site icon: favico.ico

type the follow command:

debarm:~/playground/python/tornado/led# python led.py

It is possible to use a different GPIO line just changing the line

led = ablib.Daisy11('D11','L1')

Open your browser and try to send the on-off command directly using these urls:

• http://CORE9G25_board_ip_address:8080/ledon
• http://CORE9G25_board_ip_address:8080/ledoff

Now open the default web page:

• http://board_ip_address:8080

and turn on-off the led using the two HTML buttons like these:

Led control panel  

ON  OFF

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Related links

• Tool to generate favicon.ico file on line