//code sourced from [Bytes N Bits]
#include <SoftwareSerial.h>

const byte pinRX = 2, pinTX = 3, bt_Vin = 4;
const byte button_Vin = 9, button_Vout = 11;

SoftwareSerial BTSerial(pinRX, pinTX);


void setup() {
  // put your setup code here, to run once:

  Serial.begin(9600);
  BTSerial.begin(9600);
  delay(1000);

  pinMode(pinRX, INPUT);
  pinMode(pinTX, OUTPUT);
  pinMode(bt_Vin, OUTPUT); //powers bluetooth module
  pinMode(button_Vin, OUTPUT);
  pinMode(button_Vout, INPUT_PULLUP);
  delay(100);
  digitalWrite(bt_Vin, HIGH); //powers bluetooth module

  delay(500);
  

  if(BTSerial.available()) BTSerial.read(); //clears mysterious byte from bluetooth serial buffer
  //BTSerial.write("AT+BAUD4"); //sets bluetooth's baud rate to 9600
  //BTSerial.write("AT+NAMEBackseatGuardian"); //changes display name

}

void loop() {
  
  String msg = "";
  String msgbuffer = "";
  char data = "";
  char databyte = "";

  //writes "AT" to bluetooth when button is pressed
  if(digitalRead(button_Vout) == 0) { //press
    Serial.println("AT");
    BTSerial.write("AT");
    delay(100);
  }

  //command line -> bluetooth module
  while(Serial.available()){
    databyte = Serial.read();
    BTSerial.write(databyte);
    //Serial.print((char)databyte);
  }

  //bluetooth module -> serial monitor
  while(BTSerial.available()){
    databyte = BTSerial.read();
    Serial.write(databyte);
  }
 
}