Lesson 8: Ultrasonic Sensors and Distance Measurement

What is Arduino?

Arduino is an open-source electronics platform based on easy-to-use hardware and software. It consists of a physical programmable circuit board (microcontroller) and the Arduino IDE software that runs on your computer.

Arduino Uno - The Standard Board

The Arduino Uno is the most popular and widely used Arduino board. It's perfect for learning and most projects. Let's explore its key components:

Different Arduino Models

While Arduino Uno is the most common, there are many other Arduino boards designed for specific applications. Each has different capabilities, sizes, and features.

Choosing the Right Arduino

Selecting the appropriate Arduino depends on your project requirements:

Powering Your Arduino

Arduino can be powered in several ways. Understanding power requirements is crucial for reliable operation and preventing damage to your board or components.

Pin Types and Functions

Understanding the different types of pins and their capabilities is essential for connecting sensors, actuators, and other components to your Arduino.

// Pin Configuration Examples
void setup() {
  // Digital pins can be INPUT or OUTPUT
  pinMode(13, OUTPUT);    // Built-in LED
  pinMode(2, INPUT);      // Button input
  pinMode(3, INPUT_PULLUP); // Button with internal pullup
  
  // Analog pins are INPUT by default
  // No pinMode needed for analogRead()
  
  // PWM pins (marked with ~) can use analogWrite()
  // Pins 3, 5, 6, 9, 10, 11 on Uno
  
  Serial.begin(9600);
  Serial.println("Arduino Hardware Demo");
}

void loop() {
  // Digital output
  digitalWrite(13, HIGH);  // Turn on LED
  delay(500);
  digitalWrite(13, LOW);   // Turn off LED
  delay(500);
  
  // Digital input
  int buttonState = digitalRead(2);
  Serial.print("Button: ");
  Serial.println(buttonState);
  
  // Analog input
  int sensorValue = analogRead(A0);
  Serial.print("Sensor: ");
  Serial.println(sensorValue);
  
  // PWM output
  analogWrite(9, 128);  // 50% brightness/speed
}