How to build drone with arduino

Pcb-designHow-ToBeginner · 4 min read

How to Build a Drone with Arduino: Step-by-Step Guide

To build a drone with Arduino, connect motors to an ESC and control them using an Arduino board with a flight controller code. Use sensors like an IMU for stability and write code to manage motor speeds for flight control.

📐

Syntax

Here is the basic structure to control drone motors using Arduino:

setup(): Initialize motor pins and sensors.
loop(): Continuously read sensor data and adjust motor speeds.
analogWrite(pin, value): Set motor speed via ESC signal.

arduino

void setup() {
  // Initialize motor pins as outputs
  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop() {
  // Example: set all motors to half speed
  analogWrite(3, 128);
  analogWrite(5, 128);
  analogWrite(6, 128);
  analogWrite(9, 128);
  delay(1000);
}

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Example

This example shows how to control four drone motors connected to ESCs using Arduino. It sets motor speeds to hover power and can be expanded with sensors for flight control.

arduino

#include <Servo.h>

Servo motor1;
Servo motor2;
Servo motor3;
Servo motor4;

void setup() {
  motor1.attach(3); // Motor 1 ESC signal pin
  motor2.attach(5); // Motor 2 ESC signal pin
  motor3.attach(6); // Motor 3 ESC signal pin
  motor4.attach(9); // Motor 4 ESC signal pin

  // Initialize motors to stopped
  motor1.writeMicroseconds(1000);
  motor2.writeMicroseconds(1000);
  motor3.writeMicroseconds(1000);
  motor4.writeMicroseconds(1000);
  delay(2000); // Wait ESCs to arm
}

void loop() {
  // Set motors to hover speed (approx 1500 microseconds)
  motor1.writeMicroseconds(1500);
  motor2.writeMicroseconds(1500);
  motor3.writeMicroseconds(1500);
  motor4.writeMicroseconds(1500);
  delay(5000); // Keep motors running

  // Stop motors
  motor1.writeMicroseconds(1000);
  motor2.writeMicroseconds(1000);
  motor3.writeMicroseconds(1000);
  motor4.writeMicroseconds(1000);
  delay(5000);
}

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Common Pitfalls

1. Incorrect ESC calibration: ESCs must be calibrated to recognize the throttle range, or motors won't respond properly.

2. Wiring mistakes: Mixing motor power wires or signal wires can damage components or cause no motor movement.

3. Missing sensor data: Without an IMU sensor and proper code, the drone will not stabilize and may crash.

4. Power supply issues: Using insufficient battery power can cause motors to underperform or reset the Arduino.

arduino

/* Wrong way: writing analog values directly to ESC pins without Servo library */
void loop() {
  analogWrite(3, 128); // May not work with ESCs expecting servo signals
}

/* Right way: use Servo library to send correct PWM signals */
#include <Servo.h>
Servo motor;
void setup() {
  motor.attach(3);
}
void loop() {
  motor.writeMicroseconds(1500); // Correct ESC signal
}

📊

Quick Reference

ESC Signal Range: 1000 (stop) to 2000 (full speed) microseconds
Motor Pins: Connect ESC signal wires to Arduino PWM pins
Power: Use separate battery for motors and Arduino to avoid resets
Sensor: Use MPU6050 or similar IMU for flight stabilization
Calibration: Calibrate ESCs before flight

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Key Takeaways

Use the Servo library to control ESCs with correct PWM signals.

Calibrate ESCs before connecting motors to ensure proper response.

Separate power supplies for motors and Arduino prevent resets.

Add an IMU sensor for flight stability and control.

Double-check wiring to avoid damage and ensure motor operation.