Arduino hc-06 example

bluetooth-hc06.ino

/**
 * Simple routine that performs the following:
 *  1. Blink the on-board status LED every 500ms
 *  2. Configures the software UART on pins 2 and 4 (RX,TX)
 *  3. Continuously sends the string "hello" to the bluetooth module every 500ms
 *  4. If it receives a character from bluetooth, it echos it back
 *     
 *  @author mcuhq.com
 */

#include <SoftwareSerial.h> // use the software uart
SoftwareSerial bluetooth(2, 4); // RX, TX

unsigned long previousMillis = 0;        // will store last time LED was updated
const long interval = 500;           // interval at which to blink (milliseconds)
int ledState = LOW;             // ledState used to set the LED

void setup() {
  pinMode(13, OUTPUT); // for LED status
  bluetooth.begin(9600); // start the bluetooth uart at 9600 which is its default
  delay(200); // wait for voltage stabilize
  bluetooth.print("AT+NAMEmcuhq.com"); // place your name in here to configure the bluetooth name.
                                       // will require reboot for settings to take affect. 
  delay(3000); // wait for settings to take affect. 

}

void loop() {

  if (bluetooth.available()) { // check if anything in UART buffer
    bluetooth.write(bluetooth.read()); // if so, echo it back!
  }
  

  // Blink LED routine from https://www.arduino.cc/en/tutorial/blink
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      bluetooth.println("Arduino bluetooth"); // continously send this
      ledState = LOW;
    }

    // set the LED with the ledState of the variable:
    digitalWrite(13, ledState);
  }

}