HC-05 Master & Slave Communication

One of many Bluetooth-related projects coming soon.

Sep 16, 2019

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Devices & Components

Arduino Uno Rev3

Momentary Push Button

Male/Female Jumper Wires

Resistor 2.21k ohm

HC-05 Bluetooth Module

Resistor 221 ohm

Jumper wires (generic)

Resistor 10k ohm

Resistor 1k ohm

Solderless Breadboard Full Size

RGB Diffused Common Anode

Software & Tools

Arduino IDE

Project description

Code

Buttons.ino

arduino

1int R = 2;
2int G = 3;
3int B = 4;
4
5int BR = 5;
6int BG =   6;
7int BB = 7;
8
9
10void setup() {
11
12pinMode(R, OUTPUT);
13pinMode(G,   OUTPUT);
14pinMode(B, OUTPUT);
15pinMode(BR, INPUT);
16pinMode(BG, INPUT);
17pinMode(BB,   INPUT);
18  digitalWrite(R, HIGH);  
19  digitalWrite(G, HIGH);
20  digitalWrite(B,   HIGH);
21}
22
23void Red(){
24  if (digitalRead(BR==1));
25  digitalWrite(R,   LOW);
26  digitalWrite(G, HIGH);
27  digitalWrite(B, HIGH);
28}
29
30void Green(){
31   if (BG == 1);
32  digitalWrite(R, HIGH);
33  digitalWrite(G, LOW);
34  digitalWrite(B,   HIGH);
35}
36
37void Blue(){
38  if (BB == 1);
39  digitalWrite(R, HIGH);
40   digitalWrite(G, HIGH);
41  digitalWrite(B, LOW);
42}
43
44void loop() {
45   // put your main code here, to run repeatedly:
46
47}
48

int R = 2;
int G = 3;
int B = 4;

int BR = 5;
int BG =   6;
int BB = 7;


void setup() {

pinMode(R, OUTPUT);
pinMode(G,   OUTPUT);
pinMode(B, OUTPUT);
pinMode(BR, INPUT);
pinMode(BG, INPUT);
pinMode(BB,   INPUT);
  digitalWrite(R, HIGH);  
  digitalWrite(G, HIGH);
  digitalWrite(B,   HIGH);
}

void Red(){
  if (digitalRead(BR==1));
  digitalWrite(R,   LOW);
  digitalWrite(G, HIGH);
  digitalWrite(B, HIGH);
}

void Green(){
   if (BG == 1);
  digitalWrite(R, HIGH);
  digitalWrite(G, LOW);
  digitalWrite(B,   HIGH);
}

void Blue(){
  if (BB == 1);
  digitalWrite(R, HIGH);
   digitalWrite(G, HIGH);
  digitalWrite(B, LOW);
}

void loop() {
   // put your main code here, to run repeatedly:

}

SlaveCodeFINAL.ino

arduino

1const int R = 5; //R = Red LED
2const int G = 6; //G = Green LED
3const   int B = 7; //B = Blue LED
4byte BRstate = 0;
5byte BGstate = 0;
6byte BBstate   = 0;
7
8void setup() {
9  Serial.begin(38400);
10  pinMode(R, OUTPUT);
11   pinMode(G, OUTPUT);
12  pinMode(B, OUTPUT);
13  digitalWrite (R, HIGH);
14   digitalWrite (G, HIGH);
15  digitalWrite (B, HIGH);
16}
17
18void loop() {
19
20   if (Serial.available() > 0) {
21    BRstate = Serial.read();
22  }
23  if (BRstate   == 'R') {
24    Serial.println("Red");
25    digitalWrite (R, LOW); //Set to   LOW to turn ON.
26  }  else if (BRstate == 0) {
27    digitalWrite (R, HIGH);
28   }
29  if (Serial.available() > 0) {
30    BGstate = Serial.read();
31  }
32   if (BGstate == 'G') {
33    Serial.println("Green");
34    digitalWrite (G,   LOW);
35  } else if (BGstate == 0) {
36    digitalWrite (G, HIGH);
37  }
38   if (Serial.available() > 0) {
39    BBstate = Serial.read();
40  }
41  if (BBstate   == 'B') {
42    Serial.println("Blue");
43    digitalWrite (B, LOW);
44  }   else if (BBstate == 0) {
45    digitalWrite (B, HIGH);
46  }
47}
48

const int R = 5; //R = Red LED
const int G = 6; //G = Green LED
const   int B = 7; //B = Blue LED
byte BRstate = 0;
byte BGstate = 0;
byte BBstate   = 0;

void setup() {
  Serial.begin(38400);
  pinMode(R, OUTPUT);
   pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
  digitalWrite (R, HIGH);
   digitalWrite (G, HIGH);
  digitalWrite (B, HIGH);
}

void loop() {

   if (Serial.available() > 0) {
    BRstate = Serial.read();
  }
  if (BRstate   == 'R') {
    Serial.println("Red");
    digitalWrite (R, LOW); //Set to   LOW to turn ON.
  }  else if (BRstate == 0) {
    digitalWrite (R, HIGH);
   }
  if (Serial.available() > 0) {
    BGstate = Serial.read();
  }
   if (BGstate == 'G') {
    Serial.println("Green");
    digitalWrite (G,   LOW);
  } else if (BGstate == 0) {
    digitalWrite (G, HIGH);
  }
   if (Serial.available() > 0) {
    BBstate = Serial.read();
  }
  if (BBstate   == 'B') {
    Serial.println("Blue");
    digitalWrite (B, LOW);
  }   else if (BBstate == 0) {
    digitalWrite (B, HIGH);
  }
}

Buttons.ino

arduino

1int R = 2;
2int G = 3;
3int B = 4;
4
5int BR = 5;
6int BG =  6;
7int BB = 7;
8
9
10void setup() {
11
12pinMode(R, OUTPUT);
13pinMode(G,  OUTPUT);
14pinMode(B, OUTPUT);
15pinMode(BR, INPUT);
16pinMode(BG, INPUT);
17pinMode(BB,  INPUT);
18  digitalWrite(R, HIGH);  
19  digitalWrite(G, HIGH);
20  digitalWrite(B,  HIGH);
21}
22
23void Red(){
24  if (digitalRead(BR==1));
25  digitalWrite(R,  LOW);
26  digitalWrite(G, HIGH);
27  digitalWrite(B, HIGH);
28}
29
30void Green(){
31  if (BG == 1);
32  digitalWrite(R, HIGH);
33  digitalWrite(G, LOW);
34  digitalWrite(B,  HIGH);
35}
36
37void Blue(){
38  if (BB == 1);
39  digitalWrite(R, HIGH);
40  digitalWrite(G, HIGH);
41  digitalWrite(B, LOW);
42}
43
44void loop() {
45  // put your main code here, to run repeatedly:
46
47}
48

int R = 2;
int G = 3;
int B = 4;

int BR = 5;
int BG =  6;
int BB = 7;


void setup() {

pinMode(R, OUTPUT);
pinMode(G,  OUTPUT);
pinMode(B, OUTPUT);
pinMode(BR, INPUT);
pinMode(BG, INPUT);
pinMode(BB,  INPUT);
  digitalWrite(R, HIGH);  
  digitalWrite(G, HIGH);
  digitalWrite(B,  HIGH);
}

void Red(){
  if (digitalRead(BR==1));
  digitalWrite(R,  LOW);
  digitalWrite(G, HIGH);
  digitalWrite(B, HIGH);
}

void Green(){
  if (BG == 1);
  digitalWrite(R, HIGH);
  digitalWrite(G, LOW);
  digitalWrite(B,  HIGH);
}

void Blue(){
  if (BB == 1);
  digitalWrite(R, HIGH);
  digitalWrite(G, HIGH);
  digitalWrite(B, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

}

MasterCodeFINAL.ino

arduino

1const int BR = 2; //BR = Button for Red
2const int BG = 3; //BG = Button  for Green
3const int BB = 4; //BB = Button for Blue
4byte BRstate = 0;
5byte  BGstate = 0;
6byte BBstate = 0;
7
8void setup() {
9  Serial.begin(38400);
10  pinMode(BR, INPUT);
11  pinMode(BG, INPUT);
12  pinMode(BB, INPUT);
13}
14
15void  loop() {
16
17  BRstate = digitalRead(BR);
18  BGstate = digitalRead(BG);
19  BBstate = digitalRead(BB);
20
21  if (BRstate == HIGH) {
22    Serial.println("Red");
23    Serial.write ('R');
24  } else {
25    Serial.write(0);
26  }
27
28  if  (BGstate == HIGH) {
29    Serial.println("Green");
30    Serial.write ('G');
31  } else {
32    Serial.write(0);
33  }
34
35  if (BBstate == HIGH) {
36    Serial.println("Blue");
37    Serial.write ('B');
38  } else {
39    Serial.write(0);
40  }
41}
42

const int BR = 2; //BR = Button for Red
const int BG = 3; //BG = Button  for Green
const int BB = 4; //BB = Button for Blue
byte BRstate = 0;
byte  BGstate = 0;
byte BBstate = 0;

void setup() {
  Serial.begin(38400);
  pinMode(BR, INPUT);
  pinMode(BG, INPUT);
  pinMode(BB, INPUT);
}

void  loop() {

  BRstate = digitalRead(BR);
  BGstate = digitalRead(BG);
  BBstate = digitalRead(BB);

  if (BRstate == HIGH) {
    Serial.println("Red");
    Serial.write ('R');
  } else {
    Serial.write(0);
  }

  if  (BGstate == HIGH) {
    Serial.println("Green");
    Serial.write ('G');
  } else {
    Serial.write(0);
  }

  if (BBstate == HIGH) {
    Serial.println("Blue");
    Serial.write ('B');
  } else {
    Serial.write(0);
  }
}

SlaveCodeFINAL.ino

arduino

1const int R = 5; //R = Red LED
2const int G = 6; //G = Green LED
3const  int B = 7; //B = Blue LED
4byte BRstate = 0;
5byte BGstate = 0;
6byte BBstate  = 0;
7
8void setup() {
9  Serial.begin(38400);
10  pinMode(R, OUTPUT);
11  pinMode(G, OUTPUT);
12  pinMode(B, OUTPUT);
13  digitalWrite (R, HIGH);
14  digitalWrite (G, HIGH);
15  digitalWrite (B, HIGH);
16}
17
18void loop() {
19
20  if (Serial.available() > 0) {
21    BRstate = Serial.read();
22  }
23  if (BRstate  == 'R') {
24    Serial.println("Red");
25    digitalWrite (R, LOW); //Set to  LOW to turn ON.
26  }  else if (BRstate == 0) {
27    digitalWrite (R, HIGH);
28  }
29  if (Serial.available() > 0) {
30    BGstate = Serial.read();
31  }
32  if (BGstate == 'G') {
33    Serial.println("Green");
34    digitalWrite (G,  LOW);
35  } else if (BGstate == 0) {
36    digitalWrite (G, HIGH);
37  }
38  if (Serial.available() > 0) {
39    BBstate = Serial.read();
40  }
41  if (BBstate  == 'B') {
42    Serial.println("Blue");
43    digitalWrite (B, LOW);
44  }  else if (BBstate == 0) {
45    digitalWrite (B, HIGH);
46  }
47}
48

const int R = 5; //R = Red LED
const int G = 6; //G = Green LED
const  int B = 7; //B = Blue LED
byte BRstate = 0;
byte BGstate = 0;
byte BBstate  = 0;

void setup() {
  Serial.begin(38400);
  pinMode(R, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
  digitalWrite (R, HIGH);
  digitalWrite (G, HIGH);
  digitalWrite (B, HIGH);
}

void loop() {

  if (Serial.available() > 0) {
    BRstate = Serial.read();
  }
  if (BRstate  == 'R') {
    Serial.println("Red");
    digitalWrite (R, LOW); //Set to  LOW to turn ON.
  }  else if (BRstate == 0) {
    digitalWrite (R, HIGH);
  }
  if (Serial.available() > 0) {
    BGstate = Serial.read();
  }
  if (BGstate == 'G') {
    Serial.println("Green");
    digitalWrite (G,  LOW);
  } else if (BGstate == 0) {
    digitalWrite (G, HIGH);
  }
  if (Serial.available() > 0) {
    BBstate = Serial.read();
  }
  if (BBstate  == 'B') {
    Serial.println("Blue");
    digitalWrite (B, LOW);
  }  else if (BBstate == 0) {
    digitalWrite (B, HIGH);
  }
}

Downloadable files

Buttons Circuit Test

HC-05 Slave Module Schematics

HC-05 Master Module Schematics

HC-05 Slave Module Schematics

Buttons Circuit Test

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