Control an LED by Bluetooth(Arduino + HC-05)!

This project will use HC-05 controlled by an Arduino Uno to control an LED

Sep 5, 2025

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Apache-2.0

Communication

Internet Of Things

Lights

Devices & Components

Arduino Uno Rev3

Jumper Wires

2k ohm resistor

1000 Ohm Resistor

Breadboard 100x70

5mm Red LED

Resistor 220 ohm

HC-05 Bluetooth Module

Software & Tools

Arduino Bluetooth Control

Arduino IDE

Project description

Code

Controlling an LED with Bluetooth

cpp

This code is a basic tested version. Mods allowed.

1#include <SoftwareSerial.h>
2
3  SoftwareSerial bt(10,11);
4
5  const int led = 13;
6
7  char c;
8  void setup() {
9    // put your setup code here, to run once:
10    bt.begin(9600);
11    pinMode(led,OUTPUT);
12  }
13
14  void loop() {
15    // put your main code here, to run repeatedly:
16    if(bt.available()){
17      c = (char)bt.read();
18      if(c == '1'){
19        digitalWrite(led,HIGH);
20      }
21      else if(c == '0'){
22        digitalWrite(led,LOW);
23        c = '\0';
24      }
25    }
26  }

#include <SoftwareSerial.h>

  SoftwareSerial bt(10,11);

  const int led = 13;

  char c;
  void setup() {
    // put your setup code here, to run once:
    bt.begin(9600);
    pinMode(led,OUTPUT);
  }

  void loop() {
    // put your main code here, to run repeatedly:
    if(bt.available()){
      c = (char)bt.read();
      if(c == '1'){
        digitalWrite(led,HIGH);
      }
      else if(c == '0'){
        digitalWrite(led,LOW);
        c = '\0';
      }
    }
  }

Downloadable files

Code for Controlling an LED with Bluetooth(HC-05 and Arduino Uno)

bluetooth_led1.ino

Circuit for controlling an LED using Bluetooth

This circuit was designed in Cirkit.

file.None