![]() ![]() The Arduino Uno has 14 general-purpose input/output ( GPIO) pins that can be used for digital input/output (I/O)-that is, to read or write digital information ( HIGH or LOW) using digitalRead() and digitalWrite(), respectively. To do this, we have to introduce digital output. ![]() Then, we will modify this code to flash the LED both on and off. Now, we are going to write code to turn on our LED by setting Pin 3 to HIGH (or 5V). Please follow our step-by-step installation and customization instructions here. The libraries for AVR microcontrollers like the ATmega328 (which the Arduino Uno uses) is in GitHub here.īut first, we need to download and install the Arduino IDE (if you haven’t already). The source code for Arduino is hosted on GitHub. The core libraries are written in the C and C++ programming language and compiled using avr-gcc and AVR libc. The Arduino software is open source and consists of a development environment (called an IDE) and core libraries. Next, we’ll write C/C++ code for the Arduino’s microcontroller to turn on the LED from Pin 3, which will programmatically set Pin 3 to 5V. You can always return to our breadboard lesson to refresh your memory! You will use the same materials as before, but you will also need the Arduino IDE and a USB cable to upload your program from your computer to your Arduino. This begins our entrée into the two key aspects of working with microcontrollers: (1) building circuits and (2) writing code to interact with those circuits. In this lesson, we are going to do something more exciting: use the Arduino to turn the LED on and off by programmatically controlling the output voltage on one of Arduino’s GPIO pins. While this enabled us to learn about Arduino’s supply voltage and GND pins and gave us practical experience wiring electrical components into the Arduino ports, it was admittedly, a toy exercise. In our first lesson, we directly hooked up an LED circuit to the Arduino’s 5V and 3.3V pins. Mental model check: code is loaded and running on the Arduino.Setting and visualizing different blinking frequencies. ![]()
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