Created October 21, 2020 © GPL3+

Arduino HC-05 BLUTOOTH RGB led

Control RGB led with your smart phone

AdvancedFull instructions provided83

Things used in this project

Hardware components

SparkFun Arduino Pro Mini 328 - 5V/16MHz

HC-05 Bluetooth Module

Solderless Breadboard Full Size

Jumper wires (generic)

RGB Diffused Common Cathode

Resistor 1k ohm

SparkFun USB to Serial Breakout - FT232RL

Software apps and online services

Arduino IDE

Arduino IDE 2.0 (beta)

Story

About the project :-

in this project I combined an Arduino nano with HC-05 BLUTOOTH and RGB led

So you can control the colors of RGB led with the blutooth of your smart phone.

Let's get stated!

Required parts for this project :-

Arduino nano

HC-05 blutooth

RGB led (common cathode type)

Breadboard and jumper wires

2K and 4.7K resistors X 1

1k resistors X3

Patience

HC-05 blutooth :-

HC-05 blutooth is a blutooth module . we can communicate with it with the given Tx and Rx pins. HC-05 uses USART communication to talk to microcontrollers and other devices like FT232Rl USB to UART chip .The HC-05 Works on 3.3V voltage levels but Arduino Works on 5V logic levels so I connected a 2K and 4.7K resistors in series to change the logic level of the Tx pin of Arduino. Before powering the circuit please keep on pressing the push button of HC-05 because it is necessary to pair it with the blutooth of your smart phone pairing code of blutooth module is 1234 and device name is HC-05 but through AT command we can change the settings of blutooth module after pairing blutooth you need to download BT-Terminal application in your smart phone by paly store.

Things to keep in your mind :-

pairing code of HC-05 is 1234 and it works on 3.3V logic,5V kills it. to on red led type red in BT -Terminal and then send it and 'red' led lights up send 'green' and 'blue' like red to on green and blue lights.

NECESSARY:

remove the Tx and Rx before uploading my code other wise the they will interfare to one another and code would not upload on your board after uploading the code successfully connect the RX and Tx pins as before.

SUCCESS!

Enjoy yourself

Author- Ramji Patel Jhansi (INDIA)

Code

Arduino HC-05 blutooth code to control RGB led colors

int ledred = 8;
int ledgreen =9;
int ledblue = 10;
char inSerial[15];
int tx = 1;
int rx = 0;


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledred, OUTPUT);
pinMode(ledgreen, OUTPUT);
pinMode(ledblue, OUTPUT);
pinMode(tx ,OUTPUT);
pinMode(rx, INPUT);
allpinslow();
}

void loop() {
  // put your main code here, to run repeatedly:
int i = 0;
int m = 0;
delay(500);
if(Serial.available() > 0){
  while(Serial.available() > 0){
    inSerial[i]=Serial.read();
    i++;
  }
  inSerial[i] = '\0';
  check_protocol(inSerial);
}}
void allpinslow()
{
  digitalWrite(ledred, LOW);
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledblue, LOW);
}
void check_protocol(char instr[])
{
  int i = 0;
  int m = 0;
  Serial.println(instr);
if(!strcmp(instr,"red")){
  allpinslow();
  digitalWrite(ledred, HIGH);
  Serial.println("red on");
  for(m=0;m<11;m++){
    instr[m] = 0;
  }
  i = 0;
}
if(!strcmp(instr,"green")){
  allpinslow();
  digitalWrite(ledgreen, HIGH);
  Serial.println("green on");
  for(m=0;m<11;m++){
    instr[m] = 0;
  }
  i = 0;
}
if(!strcmp(instr,"blue")){
  allpinslow();
  digitalWrite(ledblue, HIGH);
  Serial.println("blue on");
  for(m=0;m<11;m++){
    instr[m] = 0;
  }
  i = 0;
}
else{
  for(m=0;m<11;m++){
    instr[m] = 0;
  }
i = 0;
}
}

Credits

Ramji Patel

26 projects • 18 followers

Myself Ramji Patel. I am an Engineering student and pursuing my B-Tech from Institute of engineering and rural Technology Prayagraj, India.

Arduino HC-05 BLUTOOTH RGB led

Things used in this project

Hardware components

Software apps and online services

Story

Schematics