Arduino control Servo Motor via Bluetooth

In this tutorial, we will learn how to program an Arduino to control a Servo Motor using either Bluetooth (HC-05 module) or BLE (HM-10 module). Instructions for both modules are provided.

We will use the Bluetooth Serial Monitor App on smartphone to send the angle value to Arduino. Arduino will control the servo motor according to the received value.

Hardware Required

1	×	Arduino UNO or Genuino UNO
1	×	USB 2.0 cable type A/B (for USB-A PC)
1	×	USB 2.0 cable type C/B (for USB-C PC)
1	×	HC-05 Bluetooth Module
1	×	(Alternative) HM-10 BLE Module
1	×	Servo Motor
1	×	Jumper Wires
1	×	(Recommended) Screw Terminal Block Shield for Arduino Uno
1	×	(Recommended) Breadboard Shield For Arduino Uno
1	×	(Recommended) Enclosure For Arduino Uno

Or you can buy the following sensor kits:

1	×	DIYables Sensor Kit (30 sensors/displays)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some links in this section are Amazon affiliate links. If you make a purchase through these links, we may earn a commission at no extra cost to you.
Additionally, some links direct to products from our own brand, DIYables.

About Servo Motor and Bluetooth Module

If you are unfamiliar with Servo Motors and Bluetooth Modules, including their pinouts, functionality, and programming, please refer to the following tutorials for more information:

Wiring Diagram

To control a Servo Motor using Classic Bluetooth, use the HC-05 Bluetooth module, and refer to the wiring diagram provided below.

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To control a Servo Motor using BLE, use the HM-10 BLE module, and refer to the wiring diagram provided below.

This image is created using Fritzing. Click to enlarge image

Arduino Code - controls Servo Motor via Bluetooth/BLE

The code provided below is compatible with both the HC-10 Bluetooth module and the HM-10 BLE module.

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-controls-servo-motor-via-bluetooth */ // NOTE: change the Serial to other Serial/Software Serial if you connects Bluetooth module to other pins #include <Servo.h> Servo servo; // create servo object to control a servo int pos = 0; // variable to store the servo position void setup() { Serial.begin(9600); servo.attach(11); // attaches the servo on pin 11 to the servo object } void loop() { if (Serial.available()) { // if there is data comming int angle = Serial.parseInt(); if (angle >= 0 && angle <= 180) { servo.write(angle); // rotate servo Serial.print("Rotated servo to angle: ");// reports action to smartphone app Serial.println(angle); } else { Serial.print("Invalid angle: ");// reports invalid value to smartphone app Serial.println(angle); } } }

Quick Steps

Install Bluetooth Serial Monitor App on your smartphone
Copy the provided code and open it with the Arduino IDE, then upload it to your Arduino board.
If you have trouble uploading the code, try disconnecting the TX and RX pins from the Bluetooth module, uploading the code, and then reconnecting the RX/TX pins again.
Open the Bluetooth Serial Monitor App on your smartphone and select the Classic Bluetooth or BLE option, depending on the module you are using.

Pair the app with the HC-05 Bluetooth module or HM-10 BLE module.

Type in an angle value (e.g. 45 or 90) and click the Send button.

You should see the Servo Motor's angle change.
Observe the results on the Android App.

If the Bluetooth Serial Monitor app is useful for you, please give it a 5-star rating on Play Store. Thank you!

Video Tutorial

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Function References

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