14.3 Bluetooth

A ZS-040 (detected as HC-0X) bluetooth module is provided in our Arduino course on-site, which looks like:

The ONLY difference is that the provided bluetooth module has 4 pins but NOT 6 pins, without pin STATE and pin EN.

Hardware Wiring

Sketch

The code can be found at Examples_Arduino - arduinocc - _003_Bluetooth - _003_Bluetooth.ino You can also refer to Adafruit's official website at https://howtomechatronics.com/tutorials/arduino/arduino-and-hc-05-bluetooth-module-tutorial/.

#include <SoftwareSerial.h>
#define ledPin 7

SoftwareSerial mySerial(10, 11); // RX, TX
int state = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);
  Serial.begin(38400); // Default communication rate of the Bluetooth module
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  //mySerial.println("Hello, world?");
}

void loop() {   
  if(mySerial.available() > 0){ // Checks whether data is coming from the serial port
    state = mySerial.read(); // Reads the data from the serial port
    Serial.print("mySerial available!\n");
 }

 if (state == '0') {
  digitalWrite(ledPin, LOW); // Turn LED OFF
  Serial.println("LED: OFF"); // Send back, to the phone, the String "LED: ON"
  state = 0;
 }
 else if (state == '1') {
  digitalWrite(ledPin, HIGH);
  Serial.println("LED: ON");;
  state = 0;
 } 
}

Note: Please remove your bluetooth module before flashing your code onto Arduino board. Otherwise, you'll obtain the following ERROR messages:

Mobile APPs

Arduino Bluetooth Tutorial Example Android App

This APP can be downloaded from https://howtomechatronics.com/download/arduino-bluetooth-tutorial-example-android-app/?wpdmdl=2833

After the installation, by click on Connect on the FIRST page of this APP, you'll see all detected bluetooth devices as:

By selecting one of the devices, you'll see the device is NOW connected.

By clicking Turn ON and Turn OFF, you will see the led can be light on and off accordingly.

And, some serial message will be printed on the Monitor Serial dialog as:

Longer Vision Robot LVControl

Longer Vision Robot provides its own APP LVContrl, which can be downloaded from ...

The first page of LVContrl looks like:

By selecting page BTSet, we can easily SEARCH FOR VISIBLE DEVICES:

After simply pair the device by just clicking on the listed device name, you will be able to see that our bluetooth device is now listed in LIST PAIRED DEVICES.