![]() To clean up the entire set of pins, invoke GPIO.cleanup(). The Pi ‘expresses its displeasure’ with a warning. You must clean up the pin set-ups before your program exits otherwise those pin settings will persist, and that might cause trouble when you use the same pins in another program. (Steps 3 and 4 are extensively explained in the following sections.) Step 3: Set up the necessary input and output pins. In order to keep things simple, we will use only GPIO.BOARD here. GPIO.BOARD stands for physical numbering and GPIO.BCM stands for Broadcom numbering. ![]() It takes either GPIO.BOARD or GPIO.BCM as the parameter. Step 2: Set the numbering style to be used. Let us discuss the steps involved in writing a GPIO Python script, in general. So the ‘Hello world’ of GPIO programming is done! The GPIO programming workflow You will get some basic information about your Pi printed as the output. Now, fire up IDLE or the Python console and type the following commands: import RPi.GPIO as GPIO If you are using any other operating system, the package can be installed by using the following command: $ sudo pip install RPi.GPIO It is already installed in Raspbian, the default operating system for Pi. The Python package used for Raspberry Pi GPIO programming is RPi.GPIO. Programming the pinsĪrmed with some understanding about the pins, let us move to programming. It is always good to have a descriptive pinout diagram printed out for quick reference as well as a multimeter on the work desk. A majority of the pins are directly connected to the SoC so while connecting circuits or components, one should be careful to avoid wrong wiring and short circuits. Most of the pins have alternative functions, as shown in the figure. There are eight ground pins and two +5V pins and three +3.3V pins, which are not programmable. ![]() This is also known as GPIO numbering and is shown as GPIO# in the figure.Īs you have probably guessed already, all the pins are not programmable. Raspberry Pi 2 and Zero use BCM2836 and BCM2835, while the Pi 2 version 1.2 and 3 use BCM2837. Raspberry Pi uses a SoC developed by Broadcom Limited. The Broadcom numbering system is the default option for the SoC (System-on-Chip). And the image represents what is seen when the Pi is held with the USB ports facing downwards. In the first case, the pins are numbered sequentially from one to 40. Raspberry Pi pins are numbered in two different ways- physical numbering and Broadcom numbering (BCM). Figure 1 is a pinout diagram, taken from Wikipedia.įigure 1: Raspberry Pi pinout diagram Numbering systems What makes Raspberry Pi suitable for making IoT projects is its 40-pin expansion header. Unless explicitly specified otherwise, from now onwards, the name Pi refers to Raspberry Pi 2 Model B, 3 Model B or Zero. For all the programs and circuits discussed here, I have used Raspberry Pi 3. In this article, we will learn to use it as a development board. Yet, it has been used in many open source projects. Contrary to common belief, Raspberry Pi is not entirely open source. It is the best-selling British computer ever, with more than 10 million pieces sold already. Raspberry Pi is a sensational single-board computer ( SBC) and development board, which is heavily used for the prototyping of IoT based products. The GPIO package bundled with Raspbian is aimed at Raspberry Pi beginners who are familiar with Python and interested in designing IoT products. ![]() Related: Text Editors vs.This article uses the RPi.GPIO Python package to introduce Raspberry Pi GPIO programming. However, if you fancy a comprehensive experience, you need an IDE. If you prefer text editors, you can install your favorite editor and start coding right away. It features Python and Scratch as its main programming languages, both of which come pre-installed on the system.Īdditionally, there is also support for other programming languages so you can write programs or scripts in your preferred programming language.īut, to create applications/programs on the Raspberry Pi, you need an environment where you can write and test out your code. This is a Debian-based 32-bit Linux distribution developed by the Raspberry Pi Foundation. Raspberry Pi runs on its own operating system called Raspberry Pi OS (formerly Raspbian). It's this democratization of Pi that ultimately laid its foundation as a device that's now widely used by many to learn about concepts of computers, electronics, and other hardware verticals. ![]()
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