Sample program to demonstrate Bluetooth serial reading on Arduino.

gistfile1.txt

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_DC 4
#define OLED_CS 3
#define OLED_CLK 52
#define OLED_MOSI 51
#define OLED_RESET 5
Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

int led = 30;
int cursor_y = 0;
int cursor_x = 0;
boolean clear_dsp = false;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial to PC communication at 9600 bits per second:
  Serial.begin(9600);
  // initialize serial to Bluetooth at 9600 bits per second:
  Serial1.begin(38400);
  initUART();
  
  pinMode(led, OUTPUT);
  digitalWrite(led, HIGH);
  delay(500);
  digitalWrite(led, LOW);
  
  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC);
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(2);
  display.setCursor(0,0);
  display.println("HELLO");
  display.display();
  delay(10000);
  display.clearDisplay();
}

// the loop routine runs over and over again forever:
void loop() {
  if(Serial1.available()) {
    if(clear_dsp){
      display.clearDisplay();
      clear_dsp = false;
    }
    digitalWrite(led, HIGH);
    char bt_data = (char)Serial1.read();
    Serial.write(bt_data);
    
    display.setTextColor(WHITE);
    display.setTextSize(2);
    display.setCursor(cursor_y,cursor_x);
    if(SSD1306_LCDWIDTH - 11 < cursor_y){
      cursor_x = cursor_x + 16;
      cursor_y = 0;
    }
    else{
      cursor_y = cursor_y + 12;
    }
    display.println(bt_data);
    display.display();
  }
  else {
    display.display();
    digitalWrite(led, LOW);
    cursor_y = 0;
    cursor_x = 0;
    clear_dsp = true;
  }
}

//Initializes UART in the BT module
void initUART() {
  Serial1.write("AT+ORGL");
  Serial1.write(0x0d);
  Serial1.write(0x0a);
}