Now I’ve got a web server and I’ve got code to control the stepper motor, let’s put them together and control the stepper motor from a web browser! Here’s the new code: clockServer.py.
#!/usr/bin/env python # This code is written by Stephen C Phillips. # It is in the public domain, so you can do what you like with it # but a link to http://scphillips.com would be nice. import socket import re import RPi.GPIO as GPIO from move import Motor # Set up stepper-motor: GPIO.setmode(GPIO.BOARD) motor = Motor([18,22,24,26]) motor.rpm = 5 # Standard socket stuff: host = '' # do we need socket.gethostname() ? port = 8080 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.bind((host, port)) sock.listen(1) # don't queue up any requests # Loop forever, listening for requests: while True: print "Waiting..." csock, caddr = sock.accept() print "Connection from: " + `caddr` req = csock.recv(1024) # get the request, 1kB max req = req.split("\n") print "Request: " + req # Look in the first line of the request for a move command # A move command should be e.g. 'http://server/move?a=90' match = re.match('GET /move\?a=(\d+)\sHTTP/1', req) if match: angle = int(match.group(1)) print "Angle: " + `angle` csock.sendall("HTTP/1.0 200 OK\r\n") print "Moving motor..." motor.move_to(angle) else: # If there was no recognised command then return a 404 (page not found) print "Returning 404" csock.sendall("HTTP/1.0 404 Not Found\r\n") csock.close() print "--------"
This is pretty much the same as the little web server from the last post, but this time instead of returning a web page when we’re asked to move the motor we just return a 200 code and actually move the motor (lines 36-40). This is very nearly all in place now - I just need to get the phone to call the web server at appropriate moments.
Till then, here’s a little video: