Connect Unity Game with [ Arduino + Bluetooth module (HC‐05) ] Or ESP32

Question

I want to connect my Unity 3D Game with Micro-controller Like Arduino through Bluetooth and for that I'm using a (HC‐05) Bluetooth module.

And for that there is one plugin named Arduino Bluetooth Plugin Link in the asset Store. And Charge is 19$.

Is there any other way to do this by just using free functionality and Coding?

Answer 1

You can definitely do it by coding it yourself.

I can't aid you with the C# part but I've written code to send data over the HC-06 module for arduino and communicated with an Android app via bluetooth and bluetooth low energy.

At the end of the day is very similar to Socket programming.

So for the C# part this user has a basic working C# BT communication example

And for the Arduino side I have used this sketch:

/**************************************************
 * 
 * Using the BUILT-IN Serial.
 * 
 * CONFIGURATION:
 * 
 *          ARDUINO NANO - HC-06
 *    YELLOW     TX         RX
 *    GREEN      RX         TX
 *    RED        3V3        VCC
 *    BLACK      GND        GND
 * 
 **************************************************/
void setup() {
  // Init the Built-In Serial.
  Serial.begin(9600);
}
void loop() {
  // Send the message
  Serial.println("MISSATGE PER UN LINUX!!!");

  delay(2000);
  
}

With this wiring:

This image of the module may also be useful to you, so you can see the pinout:

So after pairing the arduino with my laptop and listening to incomming messages by using the command

$ cat /dev/rfcomm0

I started seeing the output on my console:

So instead of sending a String you can send whatever you read from your Arduino inputs and then re-parse it on your C# side.

I hope I was helpful; Good luck!!!