Hello!
In my project, I am trying to communicate from Unity to Arduino to move servo motors to specific angles and adjust the dimness of LEDs. I've found a code to send single characters that work for this purpose, but I have several servos and LEDs and multiple angles and dimness values, and there are only so many characters I can use, so I want to send strings instead.
I looked up many tutorials and found this one that explains how to send multiple characters, so I tried this but couldn't get it working. When I am using Unity and Arduino at the same time the serial monitor does not open, so I can't really check if it actually prints the characters I am sending, so I tried to use the characters directly to move the servo, which didn't work.
(I also send data from Arduino to Unity, but I deleted some of the unrelated parts to avoid confusion. I used some other tutorials for that and I wasn't sure if the OpenConnection function in the Unity code is actually useful or not so I kept it in anyway :D)
Here is the code I am using in Arduino:
#include <Servo.h>
// Example 2 - Receive with an end-marker
Servo myservo;
int val = 0;
const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data
boolean newData = false;
void setup() {
Serial.begin(9600);
myservo.attach(10);
}
void loop() {
recvWithEndMarker();
myservo.write(val);
delay(15);
}
void recvWithEndMarker() {
static byte ndx = 0;
char endMarker = '>';
char rc;
while (Serial.available() > 0 && newData == false) {
rc = Serial.read();
if (rc != endMarker) {
receivedChars[ndx] = rc;
ndx++;
if (ndx >= numChars) {
ndx = numChars - 1;
}
}
else {
receivedChars[ndx] = '\0'; // terminate the string
ndx = 0;
newData = true;
}
}
if (receivedChars == 's110'){
val = 10;
}
if (receivedChars == 's120'){
val = 20;
}
if (receivedChars == 's130'){
val = 30;
}
if (receivedChars == 's140'){
val = 40;
}
if (receivedChars == 's150'){
val = 50;
}
if (receivedChars == 's160'){
val = 60;
}
}
And here is the code for Unity:
using UnityEngine;
using System.Collections;
using System.IO.Ports;
using System.Threading;
using UnityEngine.UI;
public class Sending : MonoBehaviour {
public static SerialPort sp = new SerialPort("COM6", 9600);
int val = 0;
void Start () {
OpenConnection();
}
void Update () {
if (sp.IsOpen)
{
try
{
ReadArduino(sp.ReadByte());
print(sp.ReadByte());
}
catch (System.Exception)
{
}
}
if (Input.GetKeyDown(KeyCode.Alpha1))
{
sp.Write("s110>");
}
if (Input.GetKeyDown(KeyCode.Alpha2))
{
sp.Write("s120>");
}
if (Input.GetKeyDown(KeyCode.Alpha3))
{
sp.Write("s130>");
}
if (Input.GetKeyDown(KeyCode.Alpha4))
{
sp.Write("s140>");
}
if (Input.GetKeyDown(KeyCode.Alpha5))
{
sp.Write("s150>");
}
if (Input.GetKeyDown(KeyCode.Alpha6))
{
sp.Write("s160>");
}
}
public void OpenConnection()
{
if (sp != null)
{
if (sp.IsOpen)
{
sp.Close();
print("Closing port, because it was already open!");
}
else
{
sp.Open(); // opens the connection
sp.ReadTimeout = 16; // sets the timeout value before reporting error
print("Port Opened!");
}
}
else
{
if (sp.IsOpen)
{
print("Port is already open");
}
else
{
print("Port == null");
}
}
}
}
P.S. I will eventually change how the data is sent instead of using the keycode.
I am pretty sure the main problem is these lines in Arduino:
if (receivedChars == 's110'){
val = 10;
}
Any help or advice would be appreciated 
