HC-05 Master & Slave Communication

One of many Bluetooth-related projects coming soon.

Sep 16, 2019

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Components and supplies

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

Arduino UNO

RGB Diffused Common Anode

Apps and platforms

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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