The Raspberry Pi Masterclass & Resources

Wayne / Devscover


Wayne / Devscover
Raspberry Pi Masterclass Resources
I have launched a Raspberry Pi Masterclass. You can find the course here - Raspberry Pi Masterclass
This course will take you from noob to Raspberry Pi expert - no prior experience neccesary.
Here are the code resources for the course.
Pi Webcam
import io
import picamera
import logging
import socketserver
from threading import Condition
from http import server
PAGE="""\
<html>
<head>
<title>Raspberry Pi - Surveillance Camera</title>
</head>
<body>
<center><h1>Raspberry Pi - Surveillance Camera</h1></center>
<center><img src="stream.mjpg" width="640" height="480"></center>
</body>
</html>
"""
class StreamingOutput(object):
def __init__(self):
self.frame = None
self.buffer = io.BytesIO()
self.condition = Condition()
def write(self, buf):
if buf.startswith(b'\xff\xd8'):
# New frame, copy the existing buffer's content and notify all
# clients it's available
self.buffer.truncate()
with self.condition:
self.frame = self.buffer.getvalue()
self.condition.notify_all()
self.buffer.seek(0)
return self.buffer.write(buf)
class StreamingHandler(server.BaseHTTPRequestHandler):
def do_GET(self):
if self.path == '/':
self.send_response(301)
self.send_header('Location', '/index.html')
self.end_headers()
elif self.path == '/index.html':
content = PAGE.encode('utf-8')
self.send_response(200)
self.send_header('Content-Type', 'text/html')
self.send_header('Content-Length', len(content))
self.end_headers()
self.wfile.write(content)
elif self.path == '/stream.mjpg':
self.send_response(200)
self.send_header('Age', 0)
self.send_header('Cache-Control', 'no-cache, private')
self.send_header('Pragma', 'no-cache')
self.send_header('Content-Type', 'multipart/x-mixed-replace; boundary=FRAME')
self.end_headers()
try:
while True:
with output.condition:
output.condition.wait()
frame = output.frame
self.wfile.write(b'--FRAME\r\n')
self.send_header('Content-Type', 'image/jpeg')
self.send_header('Content-Length', len(frame))
self.end_headers()
self.wfile.write(frame)
self.wfile.write(b'\r\n')
except Exception as e:
logging.warning(
'Removed streaming client %s: %s',
self.client_address, str(e))
else:
self.send_error(404)
self.end_headers()
class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
allow_reuse_address = True
daemon_threads = True
with picamera.PiCamera(resolution='640x480', framerate=24) as camera:
output = StreamingOutput()
#Uncomment the next line to change your Pi's Camera rotation (in degrees)
#camera.rotation = 90
camera.start_recording(output, format='mjpeg')
try:
address = ('', 8000)
server = StreamingServer(address, StreamingHandler)
server.serve_forever()
finally:
camera.stop_recording()
Smart Home Temperature Reader
sudo pip3 install adafruit-circuitpython-dht sudo apt-get install libgpiod2
import time
import board
import adafruit_dht
dhtDevice = adafruit_dht.DHT11(board.D4, use_pulseio=False)
while True:
try:
temperature_c = dhtDevice.temperature
temperature_f = temperature_c * (9 / 5) + 32
humidity = dhtDevice.humidity
print(
"Temp: {:.1f} F / {:.1f} C Humidity: {}% ".format(
temperature_f, temperature_c, humidity
)
)
except RuntimeError as error:
# Errors happen fairly often, DHT's are hard to read, just keep going
print(error.args[0])
time.sleep(2.0)
continue
except Exception as error:
dhtDevice.exit()
raise error
time.sleep(2.0)
Smart Home Web Server
from flask import Flask, render_template
app = Flask(__name__)
@app.route('/')
def index():
return 'Hello world'
@app.route('/hello/<name>')
def hello(name):
return render_template('index.html', name=name)
if __name__ == '__main__':
app.run(debug=True, host='0.0.0.0')
<html>
<body>
<h1>Welcome {{ name }}</h1>
</body>
</html>
Home Temperature Web Page
<html>
<body>
<h1>Welcome To Our Smart Home Weather System</h1>
<h2>Temperature: {{ temperature }} C</h2>
<h2>Humidity: {{ humid }}%</h2>
</body>
</html>
from flask import Flask, render_template
import time
import board
import adafruit_dht
dhtDevice = adafruit_dht.DHT11(board.D4, use_pulseio=False)
app = Flask(__name__)
@app.route('/')
def index():
return 'Hello World!'
@app.route('/temperature')
def temp():
try:
temp_c = dhtDevice.temperature
temp_f = temp_c * (9 / 5) + 32
humid = dhtDevice.humidity
return render_template('temperature.html', temperature=temp_c, humid=humid)
except RuntimeError as error:
return error.args[0]
except Exception as error:
dhtDevice.exit()
raise error
@app.route('/hello/<name>')
def hello(name):
return render_template('index.html', name=name)
if __name__ == '__main__':
app.run(debug=True, host='0.0.0.0')