Trying to read an integer value from ReadLine()

Questions & Answers
1

Im connecting my arduino to Unity using System.IO.Ports. However, I have been now dealing with trying to convert the string from the ReadLine() method to an integer, as that is all that is being sent from the arduino (its a distance sensor, giving the distance in cm). I tried the int.Parse method but for some reason that never worked either.
Any help would be greatly appreciated.

Here’s my C# code:

using UnityEngine;
using System.Collections;
using System.IO.Ports;

public class ArduinoConnect : MonoBehaviour {
	SerialPort str= new SerialPort("COM3", 9600);
	public GameObject forceObject;
	
	//public static int Dist;

	// Use this for initialization
	void Start () {
		str.Open();
		str.ReadTimeout = 1;
	
	}
	
	// Update is called once per frame
	void Update () {
	
		if (str.IsOpen)	{
			
		try {
//---------START OF TRY---------------------------------------
		Debug.Log("Distance: "+ str.ReadLine());
				
				
		if (int.Parse(str.ReadLine()) () < 20)	{

		forceObject.rigidbody.constantForce.force=Vector3.up*10000;

		}

		else	{

		forceObject.rigidbody.constantForce.force=Vector3.zero;

		}
//---------------------END OF TRY--------------------------------------------------
		} 
		catch (System.Exception) {
				
		}	
			
		}
		
	}
}
2

I assume your Debug.Log call displays the distance? It looks like you’re reading the line twice. Each time you call str.ReadLine it’s going to read more data. Read it once, do the conversion, and operate on the variable…

int distance = int.Parse(str.ReadLine());

Debug.Log("Distance: " + distance.ToString());
if (distance < 20)
{
  ...
}