Connecting Bluetooth Mate Gold with Arduino Duemilanove

Wireless & IoT
1

Hi all,

This is my first bluetooth project. I’m having issues sending and receiving serial data.

I connected the bluetooth mate with an external 5V power supply to Vcc, Gnd to Gnd, CTS to RTS, RX (Bluetooth) to TX (Arduino), TX(Bluetooth) to RX (Arduino). I was able to pair the device with my computer. I set up a virtual COM port for the bluetooth. Then disconnected the RX and TX pins and uploaded the following code to the Arduino:

/***********************
 Bluetooth test program
***********************/

int counter = 0;
int incomingByte;

void setup() {
  Serial.begin(115200);
}

void loop() {
  // see if there's incoming serial data:
  if (Serial.available() > 0) {
    // read the oldest byte in the serial buffer:
    incomingByte = Serial.read();
    // if it's a capital R, reset the counter
    if (incomingByte == 'R') {
      Serial.println("RESET");
      counter=0;
    }
  }
  
  Serial.println(counter);
  counter++;
  
  delay(250);
}

I opened up Putty to test it. I have putty set to COM4 (my bluetooth com port) at a baudrate of 115200. I am able to enter command mode and check/adjust the baudrate. However, once I reconnect the RX and TX pins to check the arduino code I get a long line of gibberish. Mostly y’s with two dots over the top. I feel like this is a baudrate issue. However, both the arduino and putty are set at 115200. Has anyone encountered/solved/know how to solve this issue?

Cheers,

SE

2

Ive been able to connect with putty. However, I don’t understand why what I did worked. After trying all baudrates listed in the user manual I just randomly tried 115000 instead of 115200 (in both the arduino code and the putty terminal). This worked. I now receive an increasing list of numbers in putty. Does anyone know why this would work? I thought that the default Baudrate on the bluetoothmate gold was 115200.