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simple_webserver.py
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simple_webserver.py
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import RPi.GPIO as GPIO
import os
from time import sleep
from http.server import BaseHTTPRequestHandler, HTTPServer
host_name = '192.168.0.114' # Change this to your Raspberry Pi IP address
host_port = 8000
class MyServer(BaseHTTPRequestHandler):
""" A special implementation of BaseHTTPRequestHander for reading data from
and control GPIO of a Raspberry Pi
"""
def do_HEAD(self):
""" do_HEAD() can be tested use curl command
'curl -I http://server-ip-address:port'
"""
self.send_response(200)
self.send_header('Content-type', 'text/html')
self.end_headers()
def _redirect(self, path):
self.send_response(303)
self.send_header('Content-type', 'text/html')
self.send_header('Location', path)
self.end_headers()
def do_GET(self):
""" do_GET() can be tested using curl command
'curl http://server-ip-address:port'
"""
html = '''
<html>
<body style="width:960px; margin: 20px auto;">
<h1>Welcome to my Raspberry Pi</h1>
<p>Current GPU temperature is {}</p>
<form action="/" method="POST">
Turn LED :
<input type="submit" name="submit" value="On">
<input type="submit" name="submit" value="Off">
</form>
</body>
</html>
'''
temp = os.popen("/opt/vc/bin/vcgencmd measure_temp").read()
self.do_HEAD()
self.wfile.write(html.format(temp[5:]).encode("utf-8"))
def do_POST(self):
""" do_POST() can be tested using curl command
'curl -d "submit=On" http://server-ip-address:port'
"""
content_length = int(self.headers['Content-Length']) # Get the size of data
post_data = self.rfile.read(content_length).decode("utf-8") # Get the data
post_data = post_data.split("=")[1] # Only keep the value
# GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18, GPIO.OUT)
if post_data == 'On':
GPIO.output(18, GPIO.HIGH)
else:
GPIO.output(18, GPIO.LOW)
print("LED is {}".format(post_data))
self._redirect('/') # Redirect back to the root url
if __name__ == '__main__':
http_server = HTTPServer((host_name, host_port), MyServer)
print("Server Starts - %s:%s" % (host_name, host_port))
try:
http_server.serve_forever()
except KeyboardInterrupt:
http_server.server_close()