HC-05 Bluetooth Module with Arduino using OLED Display

1#include <SoftwareSerial.h>
2#include <SPI.h>
3#include <Wire.h>
4#include <Adafruit_GFX.h>
5#include <Adafruit_SSD1306.h>
6
7#define STATEPIN 2
8#define OLED_RESET 4
9
10Adafruit_SSD1306 display(OLED_RESET);
11SoftwareSerial bluetooth(10, 11);
12
13String data = "";
14
15void setup() {
16  Serial.begin(9600);
17  bluetooth.begin(9600);
18  pinMode(STATEPIN, INPUT);
19  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
20  display.clearDisplay();
21  display.setTextSize(1);
22  display.setTextColor(WHITE);
23  display.setCursor(0, 0);
24  display.println("Data Recieved: ");
25  display.display();
26}
27
28void loop() {
29  if (digitalRead(STATEPIN) == 1) 
30  {
31    Serial.println("Client Connected");
32
33    while (bluetooth.available() > 0) 
34    {
35      data = bluetooth.readString();
36      Serial.println(data);    
37      bluetooth.stopListening();
38      bluetooth.println("read");
39      bluetooth.listen();
40    }
41    display.clearDisplay();
42    display.setCursor(0, 0);
43    display.println("Data Recieved: ");
44    display.setCursor(0, 20);
45    display.println(data);
46    display.setCursor(0, 10);
47    display.println("Connected");
48    display.display();
49  } 
50  else 
51  {
52    data = "";
53    Serial.println("Disconnected");
54    display.clearDisplay();
55    display.setCursor(0, 0);
56    display.println("Data Recieved: ");
57    display.setCursor(0, 10);
58    display.println("Not Connected");
59    display.display();
60  }
61}