How can you send multiple variables from Arduino to Unity?

Question

So I currently have this for arduino.ino:

Serial.println(Variable1);

that does this in Unity:

string variable1 = stream.ReadLine();
float x = float.Parse(variable1);
transform.Rotate (0, -x/1000, 0);

My question is; How would I send 3 variables from the Arduino to Unity so I can put each value into the transform.Rotate function at once?

For example in pseudocode:

Arduino.ino
send(Variable1, Variable2, Variable3);

Unity
transform.Rotate(Variable1,Variable2,Variable3);

I hope this makes sense. Thank you.

AlwaysLearning · Accepted Answer · 2019-08-09 23:41:13Z

1

On the Arduino side you use code such as:

void sendVector(float x, float y, float z) {
  Serial.print(x, 4);
  Serial.print(" ");
  Serial.print(y, 4);
  Serial.print(" ");
  Serial.println(z, 4);
}

Be aware of precision here. For floats Serial.print(x); is equivalent to Serial.print(x, 2); which gives you two decimal places. Serial.print(x, 4); gives you four decimal places. i.e.:

Serial.print(1.23456) => "1.23"
Serial.print(1.23456, 2) => "1.23"
Serial.print(1.23456, 4) => "1.2345"

REF: Serial.print()

Now, on the Unity side, you use C# code such as:

string[] elements = stream.ReadLine().Split(' ');
float x = float.Parse(elements[0]);
float y = float.Parse(elements[1]);
float z = float.Parse(elements[2]);
transform.Rotate(x, y, z);

edited Aug 9, 2019 at 23:41

answered Aug 9, 2019 at 23:02

AlwaysLearning

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3 Comments

Jsavs00 Over a year ago

2 errors: --Assets/GyroNewNewNew.cs(31,47): error CS1503: Argument #1' cannot convert string' expression to type char[]'-- & --Assets/GyroNewNewNew.cs(31,41): error CS1502: The best overloaded method match for string.Split(params char[])' has some invalid arguments--

AlwaysLearning Over a year ago

Apologies, I used " when I should have used ', I'll update the answer.

Jsavs00 Over a year ago

Yeah I noticed after I posted it! Thank you.

Bo Peterson · Accepted Answer · 2019-08-10 15:49:20Z

0

Arduino: Print all three variables with a separator between them, for example like this:

Serial.print(Variable1);
Serial.print("|"); //separator
Serial.print(Variable2);
Serial.print("|"); //separator
Serial.println(Variable3); //println instead of print on the last one

Unity: use the split function in C# to split the read string into an array:

string[] values = variable.Split('|');

The variable values should now be an array with three elements that can be parsed into floats.

edited Aug 10, 2019 at 15:49

answered Aug 9, 2019 at 23:01

Bo Peterson

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