PWM Control with Potentiometer

A simple mbed project that uses a potentiometer to adjust the PWM duty cycle for controlling devices like LEDs or motors in real time.

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🧠 Overview

• Reads an analog value from a potentiometer.
• Maps that value to a PWM duty cycle on an output pin.
• Displays the duty cycle percentage via the serial monitor.
• Can be used for LED brightness or motor speed control.

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⚙️ Hardware Requirements

• Mbed-compatible microcontroller (e.g., NUCLEO board)
• Potentiometer (≈10 kΩ)
• Breadboard and jumper wires

Pin Connections

Component	Pin	Description
Potentiometer output	A0	Analog input
PWM output	PB_4	PWM signal output
Onboard LED	LED1	Status indicator
Power	3.3V	Potentiometer VCC
Ground	GND	Common ground

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▶️ How to Use

1. Open the code in Mbed Studio or the Mbed Online Compiler.
2. Connect the board and flash the program.
3. Open a serial monitor (9600 baud) to view duty cycle updates.
4. Rotate the potentiometer to vary the PWM signal.

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🧩 Code Reference

#include "mbed.h"

PwmOut mypwm(PB_4);
AnalogIn potentiometer(A0);
DigitalOut myled(LED1);

int main() {
    mypwm.period_ms(20);

    while (true) {
        float pot_value = potentiometer.read();
        mypwm.write(pot_value);
        printf("Duty cycle set to %.2f\n", pot_value * 100);
        thread_sleep_for(100);
    }
}

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📄 Attribution

// ENGR202: pwm output using nucleo  
// Originally Ekky Hermestian IW  
// Tilly Alton 16/10/2023  
// This code causes the built-in LED to blink.  
// The actual code is written outside the while loop but executed by calling the function blink.  
// An adaptation of bare-metal blinky, modified for PWM signal control.

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🧱 Project Structure

├── main.cpp
├── README.md
└── mbed-os/

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License

Open-source and free to use for educational purposes. Credit retained per original author attribution above.