streaming-kamera/kamera_server.py

import RPi.GPIO as GPIO
from flask import Flask, render_template, request
from src.pins import pins_out, pins_in, pins_pwm, freq

kamera_server = Flask(__name__)

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

# Create a dictionary called pins to store the pin number, name, and pin state:
pins = {
   2 : {'name' : 'GPIO 2', 'state' : GPIO.HIGH},
   3 : {'name' : 'GPIO 3', 'state' : GPIO.HIGH}
   }

# Set each pin as an output and make it low:
for pin in pins_out:
   GPIO.setup(pins_out[pin]['nr'], GPIO.OUT)
   GPIO.output(pins_out[pin]['nr'], GPIO.HIGH)

for pin in pins_in:
   GPIO.setup(pins_in[pin]['nr'], GPIO.IN)

for key, value in pins_pwm.items():
    value['pwm'].start(0)
    value['pwm'].ChangeFrequency(freq)
    value['pwm'].ChangeDutyCycle(0)

@kamera_server.route("/")
def main():
    # For each pin, read the pin state and store it in the pins dictionary:
    for pin in pins_out:
        pins_out[pin]['state'] = GPIO.input(pins_out[pin]['nr'])
    for pin in pins_in:
        pins_in[pin]['state'] = GPIO.input(pins_in[pin]['nr'])

    # Put the pin dictionary into the template data dictionary:
    templateData = {
        'pins' : pins_out,
        'pins_in' : pins_in
    }
    # Pass the template data into the template main.html and return it to the user
    return render_template('main.html', **templateData)

# The function below is executed when someone requests a URL with the pin number and action in it:
@kamera_server.route("/<changePin>/<action>")
def action(changePin, action):
    # Convert the pin from the URL into an integer:
    changePin = int(changePin)
    # Get the device name for the pin being changed:
    deviceName = pins[changePin]['name']
    # If the action part of the URL is "on," execute the code indented below:
    if action == "on":
        # Set the pin high:
        GPIO.output(changePin, GPIO.HIGH)
        # Save the status message to be passed into the template:
        message = "Turned " + deviceName + " on."
    if action == "off":
        GPIO.output(changePin, GPIO.LOW)
        message = "Turned " + deviceName + " off."

    # For each pin, read the pin state and store it in the pins dictionary:
    for pin in pins_out:
        pins_out[pin]['state'] = GPIO.input(pins_out[pin]['nr'])
    for pin in pins_in:
        pins_in[pin]['state'] = GPIO.input(pins_in[pin]['nr'])

    # Along with the pin dictionary, put the message into the template data dictionary:
    templateData = {
        'pins' : pins_out,
        'pins_in' : pins_in
    }

    return render_template('main.html', **templateData)

if __name__ == "__main__":
    kamera_server.run(host='0.0.0.0')