Intro to Raspberry Pi

First Released in February 2012

Only model to come with component video

First Released April 2012

The Raspberry Pi Model B sold over 2 Million units within 2 years of mass production.

First Released November 2015

Half to one third the size of a Model B.

The only computer to ever be attached and sold inside a magazine.

All connections are in the respective micro formats.

Version 1.3 added camera support

GPIO pins can be configured to be input or output

GPIO pins can be enabled/disabled

GPIO pins are either analog or digital

Input values are readable

Output values are writable/readable

NOOBS

• Download from raspberrypi.org/downloads/noobs
• Extract the archive
• Copy to the Micro SD card
• Boot your Raspberry Pi

Set the language and keyboard appropriately.

raspi-config

Configure keyboard, language, services including ssh and peripherals including audio and camera support.

Parts List:

• Raspberry Pi
• Breadboard
• Jumper Wires
• White LED
• 220 Ohm resistor
• 1 Relay Module
• Reed Switch
• Tactile button

Written in Python 3.

Developed and tested entirely on this Raspberry Pi 3 using the IDLE editor.

# Import the GPIO and time modules
    import RPi.GPIO as gpio
    import time

    # Define GPIO Pins Locations
    relayPin = 4
    switchPin = 21
    ledPin = 13
    reedPin = 19

    # Set up some house keeping variables
    pauseTime = 5
    switchOn = 0

    # Set the pin mode
        # BCM mode references the pin numbers on the chip
        # vs the layout of the board
    gpio.setmode(gpio.BCM)

    # GPIO setup
    gpio.setup(relayPin, gpio.OUT)
    gpio.setup(ledPin, gpio.OUT)
    gpio.setup(switchPin, gpio.IN, gpio.PUD_UP)
    gpio.setup(reedPin, gpio.IN, gpio.PUD_UP)

    # Set the relay pin to be high by default
    gpio.output(relayPin, gpio.HIGH)
    try:
        while 1:
            # Turn on the relay if the button is pressed
            if switchOn == 0 and not gpio.input(switchPin):
                print("Operating the door")
                switchOn = time.time()
                gpio.output(relayPin, gpio.LOW)

            # Turn off the relay after the pauseTime
            if switchOn != 0 and (time.time() - switchOn) > pauseTime:
                switchOn = 0
                gpio.output(relayPin, gpio.HIGH)

            # Turn on the LED if the reed switch is open
            if gpio.input(reedPin):
                gpio.output(ledPin, gpio.HIGH)
            # Turn off the LED if the reed switch is closed
            else:
                gpio.output(ledPin, gpio.LOW)

            # Sleep for the quarter second
            time.sleep(.25)
    except KeyboardInterrupt:
        # Shutdown cleanly if Ctrl-C is pressed
        print("Cleaning things up")
        gpio.cleanup()

# Import the GPIO and time modules
import RPi.GPIO as gpio
import time

# Define GPIO Pins Locations
relayPin = 4
switchPin = 21
ledPin = 13
reedPin = 19

# Set up some house keeping variables
pauseTime = 5
switchOn = 0

# Set the pin mode
    # BCM mode references the pin numbers on the chip
    # vs the layout of the board
gpio.setmode(gpio.BCM)

# GPIO setup
gpio.setup(relayPin, gpio.OUT)
gpio.setup(ledPin, gpio.OUT)
gpio.setup(switchPin, gpio.IN, gpio.PUD_UP)
gpio.setup(reedPin, gpio.IN, gpio.PUD_UP)

# Set the relay pin to be high by default
gpio.output(relayPin, gpio.HIGH)

try:
    while 1:
        # Turn on the relay if the button is pressed
        if switchOn == 0 and not gpio.input(switchPin):
            print("Operating the door")
            switchOn = time.time()
            gpio.output(relayPin, gpio.LOW)

        # Turn off the relay after the pauseTime
        if switchOn != 0 and (time.time() - switchOn) > pauseTime:
            switchOn = 0
            gpio.output(relayPin, gpio.HIGH)

        # Turn on the LED if the reed switch is open
        if gpio.input(reedPin):
            gpio.output(ledPin, gpio.HIGH)
        # Turn off the LED if the reed switch is closed
        else:
            gpio.output(ledPin, gpio.LOW)

        # Sleep for the quarter second
        time.sleep(.25)
except KeyboardInterrupt:
    # Shutdown cleanly if Ctrl-C is pressed
    print("Cleaning things up")
    gpio.cleanup()