Update tutorial

2020-12-23 08:52:18 +08:00
parent 23c3ae3508
commit c9dd54ff5a
2 changed files with 69 additions and 0 deletions
@@ -0,0 +1,69 @@
+import RPi.GPIO as GPIO
+import os
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+host_name = '192.168.1.112' # 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(17,GPIO.OUT)   # You can also choose to use other GPIO
+		if post_data == 'On':
+			GPIO.output(17, GPIO.HIGH)
+		else:
+			GPIO.output(17, 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()
+