Summary
This workshop introduces Arduino for building electronic projects. It covers essential hardware (Arduino Uno), software (Arduino IDE versions 1 and 2, web editor), and programming concepts (variables, control structures like if/else and switch-case, core Arduino functions). It also highlights the importance and usage of Arduino libraries for controlling various hardware components, demonstrating with servo motors and LED strips. The training aims to equip beginners with fundamental knowledge for embarking on Arduino projects.
Key Insights
Arduino is a tool for controlling electronic inputs and outputs with code.
Arduino acts as a central component to read information from input devices (sensors like temperature, light) and control output devices (motors, LEDs, displays) using custom logic written in code.
Recommend Arduino Uno Rev 3 for beginners due to its popularity and ease of use.
The Arduino Uno Rev 3 is recommended for beginners as the path of least resistance. It is widely used, meaning abundant code and training are available. It offers sufficient GPIO pins (20) for most applications and its board layout is standard for accessories called 'shields'.
Arduino's open-source nature allows compatible boards to work with the IDE and code.
Arduino's hardware and software are open-source, enabling other companies to produce compatible boards. These boards, along with official ones, generally work with the Arduino IDE and code, offering flexibility similar to different car models serving various use cases.
Arduino programs consist of a 'setup' function (runs once) and a 'loop' function (runs repeatedly).
Every Arduino sketch must include two main functions: 'setup()', which executes its code once at the beginning to initialize settings, and 'loop()', which repeatedly executes its code continuously until power is removed.
Libraries provide pre-written code to simplify controlling hardware and complex tasks.
Arduino libraries are collections of code packaged to simplify the use of specific hardware (like servos or sensors) or perform complex functions. They abstract away intricate details, allowing developers to focus on their project's logic.
Sections
Introduction to Arduino
Arduino is a tool for controlling electronic inputs and outputs with code.
Arduino acts as a central component to read information from input devices (sensors like temperature, light) and control output devices (motors, LEDs, displays) using custom logic written in code.
The Arduino trifecta includes hardware, IDE, and code (sketches).
To get started with Arduino, you need three main components: the physical Arduino board, the Arduino IDE software for writing code, and the Arduino code itself, referred to as a sketch.
Arduino programming uses C/C++ with specific functions and structures.
Arduino code, or sketches, is based on C and C++ programming languages but includes Arduino-specific functions and structures. Learning Arduino programming provides a foundation for other programming languages.
Choosing an Arduino Board
Recommend Arduino Uno Rev 3 for beginners due to its popularity and ease of use.
The Arduino Uno Rev 3 is recommended for beginners as the path of least resistance. It is widely used, meaning abundant code and training are available. It offers sufficient GPIO pins (20) for most applications and its board layout is standard for accessories called 'shields'.
Arduino's open-source nature allows compatible boards to work with the IDE and code.
Arduino's hardware and software are open-source, enabling other companies to produce compatible boards. These boards, along with official ones, generally work with the Arduino IDE and code, offering flexibility similar to different car models serving various use cases.
A free Arduino simulator option is available at Tinkercad.com for those without hardware.
For users with no budget, Tinkercad.com offers a free Arduino simulator. This platform allows users to build small circuits, test them, and write code within the simulator, although it has limitations on component variety and board options.
Exploring the Arduino Board (Uno)
The microcontroller is the central component of an Arduino board.
The main component on an Arduino board is the microcontroller, which acts as the 'brain' executing code to read inputs and control outputs. The board itself is a microcontroller development board designed to facilitate interaction with it.
Pins (GPIO) connect the microcontroller to the external world as inputs or outputs.
Pins on the microcontroller, accessible via pin headers on the board, are used for communication. General Purpose Input Output (GPIO) pins can be configured as either inputs to read voltage or outputs to source voltage.
Digital pins (0-13) handle binary inputs/outputs and some support PWM.
Digital pins (0-13) can read on/off states (binary inputs) or source 5V (high) or 0V (low) for outputs. Some digital pins (marked with a '~') support Pulse Width Modulation (PWM) for controlling motors or fading LEDs.
Analog pins (A0-A5) read continuous voltage signals.
Analog pins (A0-A5) are connected to the microcontroller's Analog-to-Digital Converter (ADC), allowing them to read variable voltages from sensors, which are then translated into numerical values (0-1023) by the code.
Power pins (GND, 5V, 3.3V) provide ground and voltage sources.
The power section includes ground (GND) and voltage pins (5V, 3.3V) that can be used to power external components, provided they don't draw excessive current. The VIN pin accepts external power supply voltages (7-20V, recommended up to 12V).
Arduino boards can be powered via USB, DC jack, or VIN pin.
Power can be supplied through the USB port connected to a computer, a DC jack with an external power supply (7-20V, recommended up to 12V), or the VIN pin which has similar voltage limits. External power supplies should provide at least 1A.
Arduino IDE Software
Arduino IDE (versions 1, 2, and Web Editor) is free software for writing and uploading code.
The Arduino IDE (Integrated Development Environment) is available as a downloadable desktop application (IDE 1 and the newer IDE 2) or a web-based editor. All are free and used to write 'sketches' (code) and upload them to Arduino boards.
The Arduino IDE saves sketches in a sketchbook folder, configurable in preferences.
Sketches are saved by default in an 'Arduino' folder within the user's 'Documents'. This location can be changed in the IDE's preferences, where font size and line number display can also be adjusted.
Example sketches are built into the Arduino IDE to demonstrate functionality.
The Arduino IDE includes numerous example sketches (File > Examples) covering basics and specific functionalities. These are valuable resources for learning and testing code, like the 'Blink' example for toggling an LED.
Verifying and uploading code requires selecting the correct board and port.
Before uploading code, the correct Arduino board and communication port must be selected in the 'Tools' menu. The 'Verify' button checks for errors, and the 'Upload' button sends the sketch to the board, indicated by blinking TX/RX LEDs.
Arduino IDE 1 and IDE 2 can be installed simultaneously without conflict.
Both Arduino IDE 1 and IDE 2 can coexist on the same computer. They share the same sketchbook location, meaning sketches saved in one are accessible in the other.
The Arduino Web Editor requires installing an 'Arduino Agent' for USB communication.
To upload sketches from the Arduino Web Editor via USB, a separate 'Arduino Agent' software must be installed. This agent facilitates communication between the web browser and the connected Arduino board.
Arduino Programming Fundamentals
Arduino programs consist of a 'setup' function (runs once) and a 'loop' function (runs repeatedly).
Every Arduino sketch must include two main functions: 'setup()', which executes its code once at the beginning to initialize settings, and 'loop()', which repeatedly executes its code continuously until power is removed.
Variables are containers for storing data, defined by type, name, and value.
Variables act as buckets to store information. They require a data type (e.g., int, byte, float, bool), a unique name, an assignment operator (=), and a value. Variable names can include letters, numbers, and underscores, but cannot start with a number.
Common data types include boolean, byte, int, long, float, char, and character arrays (strings).
Data types specify the kind of information a variable can hold: boolean (true/false), byte (0-255), int (-32k to 32k), long (large numbers), float (decimals), char (single character), and character arrays (sequences of characters, i.e., strings).
Statements in Arduino code must be terminated with a semicolon.
Each line of code or statement in Arduino programming must end with a semicolon (;). This signifies the completion of the instruction to the compiler.
Pin mode must be set to INPUT or OUTPUT using the 'pinMode()' function.
The 'pinMode()' function, used in 'setup()', configures a specific pin (e.g., digital pin 9) as either an INPUT (to read signals) or an OUTPUT (to send signals). Input can also be set to 'input_pullup'.
'analogWrite()' controls PWM output on compatible pins (0-255 duty cycle).
The 'analogWrite()' function outputs a Pulse Width Modulation (PWM) signal on pins capable of PWM. It takes a pin number and a value from 0 (0% duty cycle, off) to 255 (100% duty cycle, full on), allowing for effects like fading LEDs or controlling motor speed.
Control structures (if, else, switch-case) alter code execution flow based on conditions.
Control structures allow programs to make decisions. 'if' statements execute code if a condition is true. 'else' provides an alternative when the 'if' condition is false. 'switch-case' executes different code blocks based on the value of an expression.
'delay()' pauses program execution for a specified time in milliseconds.
The 'delay()' function halts the microcontroller's execution for a set duration, measured in milliseconds. This is useful for timing events or maintaining a state (e.g., keeping an LED on for a specific period).
'analogRead()' reads voltage on analog pins and converts it to a 0-1023 value.
The 'analogRead()' function reads the voltage on a specified analog pin (A0-A5) and converts it into an integer value between 0 and 1023 using the ADC. This allows reading analog sensor data.
'digitalRead()' reads the state of a digital pin (HIGH or LOW).
'The 'digitalRead()' function reads the voltage level on a digital pin. It returns HIGH (typically 5V) or LOW (typically 0V), representing the state of a digital input like a button.
'digitalWrite()' sets a digital pin to HIGH or LOW voltage.
The 'digitalWrite()' function sets the voltage on a digital pin to either HIGH (5V) or LOW (0V). This is used to control digital output devices like turning an LED on or off.
Serial communication (serial.begin, serial.print) is vital for debugging and monitoring.
The 'Serial' library enables communication between the Arduino and a computer via USB. 'Serial.begin()' initializes this communication, typically at a baud rate like 9600. 'Serial.print()' and 'Serial.println()' send data to the Serial Monitor for viewing.
Libraries provide pre-written code to simplify controlling hardware and complex tasks.
Arduino libraries are collections of code packaged to simplify the use of specific hardware (like servos or sensors) or perform complex functions. They abstract away intricate details, allowing developers to focus on their project's logic.
Libraries are installed via the IDE's Library Manager, and examples are found in File > Examples.
New libraries can be installed through the Arduino IDE's Library Manager (Sketch > Include Library > Manage Libraries or Tools > Manage Libraries). Once installed, example sketches demonstrating the library's usage are accessible under File > Examples, often listed under 'Custom Libraries'.
Using libraries accelerates development by leveraging pre-built code, like for servo motors.
Libraries significantly speed up development. For example, the Servo library allows easy control of servo motors using functions like 'attach()' and 'write()', mapping potentiometer input to servo position. Similarly, libraries like FastLED control addressable LEDs.
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*Uses 1 Wisdom coin from your coin balance