HC05 藍芽模組，Ardunio測試用

hc05_bluetooth_AT_command_test.ino

#define BT_KEY_PIN 8
#define HARDWARE_SERIAL_SPEED 38400
void setup()
{
  pinMode(BT_KEY_PIN, OUTPUT);  //設定KEY_PIN為輸出模式
  digitalWrite(BT_KEY_PIN, HIGH); //這將把藍芽模組的第34腳位拉高，使其進入AT模式
  Serial.begin(HARDWARE_SERIAL_SPEED);
  Serial.println("Bluebooth>"); //看到此提示，即可在串列終端機輸入想輸入的AT指令

void loop()
{
  // Keep reading from HC-05 and send to Arduino Serial Monitor
  if (Serial.available())
    Serial.write(Serial.read());
  // Keep reading from Arduino Serial Monitor and send to HC-05
}

hc05_bluetooth_write_baudrate.ino

#define BT_KEY_PIN 8
#define BEEPER_PIN 9
#define R1_BTN 4

#define HARDWARE_SERIAL_SPEED 38400
void setup()
{
  pinMode(BT_KEY_PIN, OUTPUT);  // this pin will pull the HC-05 pin 34 (key pin) HIGH to switch module to AT mode
  pinMode(R1_BTN, INPUT);
  digitalWrite(BT_KEY_PIN, HIGH);
  Serial.begin(HARDWARE_SERIAL_SPEED);
  Serial.println("[ARKLAB - Write Bluetooth Raud Rate Tool]");

}
void loop()
{
  if ( digitalRead(R1_BTN) == LOW) {
    Serial.println("Start Writting Bluetooth Parameter.");
    Serial.write( "AT+UART?\r\n" ); //檢查藍芽是否有回應
    String BT_readString = Serial.readString();
    Serial.print(BT_readString);
    if (BT_readString != "+UART:115200,0,0\r\n" && BT_readString != "") {
      Serial.println("[Parameter NOT match, start writing.]");
      Serial.write("AT+UART=115200,0,0\r\n");
      Serial.print(Serial.readString());
      Serial.write("AT+ROLE=1\r\n");
      Serial.print(Serial.readString());

      Serial.println("[Start checking.]");
      Serial.write("AT+UART?\r\n");
      Serial.print(Serial.readString());
      Serial.write("AT+ROLE?\r\n");
      Serial.print(Serial.readString());
      Serial.println("[END]");
      Serial.println("");
      tone(BEEPER_PIN, 1000, 250);
      delay(100);
      tone(BEEPER_PIN, 1000, 250);
    } else {
      tone(BEEPER_PIN, 2000, 1000);
    }
  }

}