Mini Fan 2.0

Note

🌟 Welcome to the SunFounder Facebook Community! Whether you’re into Raspberry Pi, Arduino, or ESP32, you’ll find inspiration, help ideas here.

✅ Be the first to get free learning resources.
✅ Stay updated on new products & exclusive giveaways.
✅ Share your creations and get real feedback.

👉 Need faster updates or support? Click [here] join our Facebook community
👉 Or join our WhatsApp group: Click [here]
🎁 Looking for parts?Check out our all-in-one kits below — packed with components, beginner-friendly guides, and tons of fun.

Name	Includes Arduino board	PURCHASE LINK
Elite Explorer Kit	Arduino Uno R4 WiFi	BUY
Universal Maker Sensor Kit	×	BUY
3 in 1 Ultimate Starter Kit	Arduino Uno R3	BUY

Course Introduction

This Arduino project controls a DC motor using a TA6586 motor driver and four push buttons. The system uses PWM control to adjust speed and responds immediately to button input.

Note

If this is your first time working with an Arduino project, we recommend downloading and reviewing the basic materials first.

Required Components

In this project, we need the following components:

SN	COMPONENT INTRODUCTION	QUANTITY	PURCHASE LINK
1	Arduino UNO R4 Minima/Arduino UNO R4 WIFI	1	BUY
2	USB Cable	1
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	DC Motor	1	BUY
6	TA6586 - Motor Driver Chip	1
7	Button	3	BUY
7	Button	4	BUY

Wiring

Common Connections:

TA6586 - Motor Driver Chip
- BI: Connect to 6 on the Arduino.
- FI: Connect to 5 on the Arduino.
- GND: Connect to breadboard’s negative power bus.
- VCC: Connect to breadboard’s red power bus.
DC Motor
- GND: Connect to TA6586 B0.
- VCC: Connect to TA6586 F0.
Button1
- Connect to breadboard’s negative power bus.
- Connect to 9 on the Arduino.
Button2
- Connect to breadboard’s negative power bus.
- Connect to 10 on the Arduino.
Button3
- Connect to breadboard’s negative power bus.
- Connect to 11 on the Arduino.
Button4
- Connect to breadboard’s negative power bus.
- Connect to 12 on the Arduino.

Writing the Code

Note

You can copy this code into Arduino IDE.
Don’t forget to select the board(Arduino UNO R4) and the correct port before clicking the Upload button.

#include <Servo.h>

// ===== Motor Control =====
const int fiPin = 5;
const int biPin = 6;
const int blueBtn = 9;
const int yellowBtn = 10;
const int redBtn = 11;

// ===== Servo Control =====
Servo servo;
const int servoPin = 3;
const int greenBtn = 12;

// ===== Variables =====
int fanSpeed = 0;            // 0=off, 128=half, 255=full
int angle = 90;              // Start centered
int direction = 1;           // 1=right, -1=left
bool servoActive = false;    // Whether oscillation is active
bool lastBtnState = HIGH;    // For toggle detection

// ===== Servo Limits =====
const int leftLimit = 45;
const int rightLimit = 135;

void setup() {
  // Motor setup
  pinMode(fiPin, OUTPUT);
  pinMode(biPin, OUTPUT);
  pinMode(blueBtn, INPUT_PULLUP);
  pinMode(yellowBtn, INPUT_PULLUP);
  pinMode(redBtn, INPUT_PULLUP);

  // Servo setup
  servo.attach(servoPin);
  pinMode(greenBtn, INPUT_PULLUP);
  servo.write(angle); // Start at center
}

void loop() {
  // ===== Fan Speed Control =====
  if (digitalRead(blueBtn) == LOW) {
    fanSpeed = 255; // Full speed
  } else if (digitalRead(yellowBtn) == LOW) {
    fanSpeed = 128; // Half speed
  } else if (digitalRead(redBtn) == LOW) {
    fanSpeed = 0;   // Stop
  }

  // Apply fan speed
  if (fanSpeed > 0) {
    analogWrite(biPin, fanSpeed);
    analogWrite(fiPin, 0);
  } else {
    analogWrite(biPin, 0);
    analogWrite(fiPin, 0);
  }

  // ===== Green Button Toggle =====
  bool currentBtnState = digitalRead(greenBtn);
  if (lastBtnState == HIGH && currentBtnState == LOW) {
    servoActive = !servoActive;  // Toggle oscillation
  }
  lastBtnState = currentBtnState;

  // ===== Servo Logic =====
  if (fanSpeed == 0) {
    // Fan off → stop servo immediately (keep current angle)
    servoActive = false;
    delay(10);
    return;
  }

  if (servoActive) {
    // Oscillation active: swing between 45° and 135°
    angle += direction;
    if (angle >= rightLimit) direction = -1;
    if (angle <= leftLimit)  direction = 1;
    servo.write(angle);
    delay(30); // Movement speed (slower = smoother)
  }
  // When servoActive is false and fan running, servo holds its last angle
}