Bluetooth Dialogue with Arduino via HC-05 Module

Arduino is controlled by Bluetooth dialogue - an LED is remotely turned up or down, a photoresistor value is remotely read.

Feb 7, 2019

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hc-05

bluetooth

remote control

Components and supplies

Resistor 1k ohm

resistor 200 ohm

Arduino UNO

Solderless Breadboard Full Size

Resistor 10k ohm

Photo resistor

HC-05 Bluetooth Module

LED (generic)

resistor 2k ohm

Project description

Code

Full Arduino sketch

arduino

Controls a photoresistor and a LED via HC-05 bluetooth dialogue

1//////////////////////////////////////////////////////////////////////////////////
2//  REMIXED BY: CESARE BRIZIO FROM AN ORIGINAL BY TECHBITAR (HAZIM BITAR)
3// LICENSE:  PUBLIC DOMAIN
4// DATE: 21/12/2017
5
6char inByte;
7int ledPin = 9; // LED  on pin 9
8int sensorPin = A0;    // input pin for the photoresistor
9float sensorValue  = 0;  // variable to store the value coming from the sensor
10
11void setup()  {
12  Serial.begin(9600);
13  pinMode(ledPin, OUTPUT);
14  Serial.println("Type  1 to turn the LED on, 0 to turn it off");
15}
16
17void loop() {
18
19  //  send data only when you receive data:
20  if (Serial.available() > 0) {
21    //  read the incoming byte:
22    inByte = Serial.read();
23    // say what you got:
24    Serial.print("RECEIVED: ");
25    Serial.println(inByte);
26    if ( inByte  == '0' ) digitalWrite(ledPin, LOW); // if it's a 0 (zero) turn LED off
27    if  ( inByte == '1' ) digitalWrite(ledPin, HIGH); // if it's a 1 (one) turn LED on
28    // read the value from the sensor:
29    sensorValue = analogRead(sensorPin);
30    Serial.print("Photoresistor reading: ");
31    Serial.print(sensorValue);
32    Serial.print(" equal to ");
33    Serial.print((sensorValue * 5) / 1024);
34    Serial.println(" V");
35  Serial.println("Type 1 to turn the LED on, 0 to  turn it off");
36}
37}

//////////////////////////////////////////////////////////////////////////////////
//  REMIXED BY: CESARE BRIZIO FROM AN ORIGINAL BY TECHBITAR (HAZIM BITAR)
// LICENSE:  PUBLIC DOMAIN
// DATE: 21/12/2017

char inByte;
int ledPin = 9; // LED  on pin 9
int sensorPin = A0;    // input pin for the photoresistor
float sensorValue  = 0;  // variable to store the value coming from the sensor

void setup()  {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  Serial.println("Type  1 to turn the LED on, 0 to turn it off");
}

void loop() {

  //  send data only when you receive data:
  if (Serial.available() > 0) {
    //  read the incoming byte:
    inByte = Serial.read();
    // say what you got:
    Serial.print("RECEIVED: ");
    Serial.println(inByte);
    if ( inByte  == '0' ) digitalWrite(ledPin, LOW); // if it's a 0 (zero) turn LED off
    if  ( inByte == '1' ) digitalWrite(ledPin, HIGH); // if it's a 1 (one) turn LED on
    // read the value from the sensor:
    sensorValue = analogRead(sensorPin);
    Serial.print("Photoresistor reading: ");
    Serial.print(sensorValue);
    Serial.print(" equal to ");
    Serial.print((sensorValue * 5) / 1024);
    Serial.println(" V");
  Serial.println("Type 1 to turn the LED on, 0 to  turn it off");
}
}

Full Arduino sketch

arduino

Controls a photoresistor and a LED via HC-05 bluetooth dialogue

1//////////////////////////////////////////////////////////////////////////////////
2//   REMIXED BY: CESARE BRIZIO FROM AN ORIGINAL BY TECHBITAR (HAZIM BITAR)
3// LICENSE:   PUBLIC DOMAIN
4// DATE: 21/12/2017
5
6char inByte;
7int ledPin = 9; // LED   on pin 9
8int sensorPin = A0;    // input pin for the photoresistor
9float sensorValue   = 0;  // variable to store the value coming from the sensor
10
11void setup()   {
12  Serial.begin(9600);
13  pinMode(ledPin, OUTPUT);
14  Serial.println("Type   1 to turn the LED on, 0 to turn it off");
15}
16
17void loop() {
18
19  //   send data only when you receive data:
20  if (Serial.available() > 0) {
21    //   read the incoming byte:
22    inByte = Serial.read();
23    // say what you got:
24     Serial.print("RECEIVED: ");
25    Serial.println(inByte);
26    if ( inByte   == '0' ) digitalWrite(ledPin, LOW); // if it's a 0 (zero) turn LED off
27    if   ( inByte == '1' ) digitalWrite(ledPin, HIGH); // if it's a 1 (one) turn LED on
28     // read the value from the sensor:
29    sensorValue = analogRead(sensorPin);
30     Serial.print("Photoresistor reading: ");
31    Serial.print(sensorValue);
32     Serial.print(" equal to ");
33    Serial.print((sensorValue * 5) / 1024);
34     Serial.println(" V");
35  Serial.println("Type 1 to turn the LED on, 0 to   turn it off");
36}
37}

//////////////////////////////////////////////////////////////////////////////////
//   REMIXED BY: CESARE BRIZIO FROM AN ORIGINAL BY TECHBITAR (HAZIM BITAR)
// LICENSE:   PUBLIC DOMAIN
// DATE: 21/12/2017

char inByte;
int ledPin = 9; // LED   on pin 9
int sensorPin = A0;    // input pin for the photoresistor
float sensorValue   = 0;  // variable to store the value coming from the sensor

void setup()   {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  Serial.println("Type   1 to turn the LED on, 0 to turn it off");
}

void loop() {

  //   send data only when you receive data:
  if (Serial.available() > 0) {
    //   read the incoming byte:
    inByte = Serial.read();
    // say what you got:
     Serial.print("RECEIVED: ");
    Serial.println(inByte);
    if ( inByte   == '0' ) digitalWrite(ledPin, LOW); // if it's a 0 (zero) turn LED off
    if   ( inByte == '1' ) digitalWrite(ledPin, HIGH); // if it's a 1 (one) turn LED on
     // read the value from the sensor:
    sensorValue = analogRead(sensorPin);
     Serial.print("Photoresistor reading: ");
    Serial.print(sensorValue);
     Serial.print(" equal to ");
    Serial.print((sensorValue * 5) / 1024);
     Serial.println(" V");
  Serial.println("Type 1 to turn the LED on, 0 to   turn it off");
}
}

Downloadable files

Fritzing schematics

Fritzing schematics including one photoresistor and one LED that can be activated remotely

Fritzing schematics

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