Lesson: 17 - Master Pulse Width Modulation (PWM) with Arduino | analogWrite() Explained
Lesson: 17 - Master Pulse Width Modulation (PWM) with Arduino | analogWrite() Explained
Hello and Welcome to Electro Nerds Academy in this video we will learn what PWM signal is? And how to generate PWM signals with Arduino. we’ll also explain how duty cycle affects output voltage, and how PWM can be used to control LED brightness, motor speed, and more.
In this video, you’ll learn:
✅ What PWM (Pulse Width Modulation) is and how it works
✅ How Arduino creates analog-like signals using PWM pins
✅ How duty cycle controls the average voltage output
✅ How to use analogWrite() to generate PWM signals
✅ How to build a fade LED project using PWM
✅ How to use the map function
✅ How to control LED brightness using a potentiometer
Code used in this video:
const int Led_Pin = 9;
const int Pot_Pin = A0;
int Pot_Value; // Variable to store the analog reading from potentiometer
int PWM_Value; // Variable to store the converted PWM value
void setup()
{
pinMode(Pot_Pin, INPUT); // Set potentiometer pin as input
pinMode(Led_Pin, OUTPUT); // Set pin 9 (PWM pin) as output for LED
}
void loop()
{
// Read potentiometer value (0 to 1023)
Pot_Value = analogRead(Pot_Pin);
// Small delay for stable reading
delay(10);
// Map the analog reading (0–1023) to PWM range (0–255)
PWM_Value = map(Pot_Value, 0, 1023, 0, 255);
// Output the PWM signal to control LED brightness
analogWrite(Led_Pin, PWM_Value);
}
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