Raspberry Pi Starter

Overview

This is my collection of basic Raspberry Pi projects and helpful resources for those getting started with the Raspberry Pi 👏

Contents

• RPi.GPIO Python module basic documentation
• Projects 💡
  • Blinking LED
  • DHT11 Temperature and humidity sensor
  • more coming soon...
• Helpful resources

GPIO Python module basic documentation

• Import RPi.GPIO module

import RPi.GPIO as GPIO

• Specify that you are using the BOARD numbering system

GPIO.setmode(GPIO.BOARD)

• Disable warnings (when you have more than one script/circuit on the GPIO)

GPIO.setwarnings(False)

• Setup up a channel (pin_number)

GPIO.setup(pin_number, GPIO.IN)
GPIO.setup(pin_number, GPIO.OUT)

-- example

GPIO.setup(7, GPIO.OUT)

• Setup multiple channels

pin_numbers = [7,14]    
GPIO.setup(pin_numbers, GPIO.OUT)

• Read the value of a GPIO pin

This will return either 0 / GPIO.LOW / False or 1 / GPIO.HIGH / True

GPIO.input(pin_number)

• Set the output state of a GPIO pin

State can be 0 / GPIO.LOW / False or 1 / GPIO.HIGH / True

GPIO.output(pin_number, state)

-- example

GPIO.output(LedPin, GPIO.HIGH)

• Output to more than one channel

pin_numbers = [7,14]
GPIO.output(pin_numbers, GPIO.LOW)                # sets all to GPIO.LOW
GPIO.output(pin_numbers, (GPIO.HIGH, GPIO.LOW))   # sets first HIGH and second LOW

• Clean up

You can clean up inividual channels or all channels like this:

GPIO.cleanup()

Projects

Blinking LED

code: blink_led.py

Execute Python program in terminal:

python blink_led.py 

Temperature and humidity sensor

• sensor DHT11
• code: temp_humid_sensor.py

Install the Adafruit DHT11 library first

1. Clone a repository

git clone https://github.com/adafruit/Adafruit_Python_DHT.git 

2. Install library

cd Adafruit_Python_DHT
sudo apt-get install build-essential python-dev
sudo python setup.py install

2. Run code temp_humid_sensor.py

python temp_humid_sensor.py 

credits: circuit.basics.com

Helpful Resources

• What you need to start with Raspberry Pi
• Getting Started with the Raspberry Pi
• Setup NOOBS
• Raspberry Pi schematics
• About GPIO pins
• Raspberry Pi Pinout
• Common Pitfalls for Beginners
• Python basics
• Rpi.GPIO Python module wiki