How to read multiple values of serial bytes in adruino?

Projects Programming
1

I am using an android phone as a remote control for the robot, I send commands via bluetooth using these codes:
char c = 'f';
int y = 2;
byte[] com = new byte[2];
com[0] = (byte) c;
com[2] = (byte) y;

The arduino clone then receives the command and reads them:
char c;
int y;

if(Serial.available() > 0){
c = Serial.read();
}

switch(c){
case 'f':
y = Serial.read();
// do anything
Serial.println(y);
break;
default:
break;
}

the problem is, it can't read separate values of the bytes being sent, I checked the serial monitor and it displays the value of the variable y and another negative value, can someone here help me? =(

2 
if(Serial.available() > 0){
    c = Serial.read();
    }

switch(c){
    case 'f':
    y = Serial.read();
    // do anything
    Serial.println(y);
    break;
    default:
   break;
}

If there is one byte to read, read both of them. I don't think that works too well. Apparently, you don't either.

Why don't you fix it?

3 
if(Serial.available() > 0){
    c = Serial.read();
    }

char c now contains a byte of data, Serial.read is the method you used to retrieve the data. You can make y = c; or print c directly. You are currently doing a second Serial.read without a test.

4

Call a function to handle the data or write them to a value for an ammount of bytes.

5

Something to try, test each character received for a 1 or 0.

int ledPin = 13;

void setup()
{
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); 
  Serial.println("serial on/off test 0021"); // so I can keep track
}
   
void loop()
{
  char c = 0;
  if (Serial.available() > 0) 
  {
    c = Serial.read();
    if (c == '1')     // assuming you send character '1', not a byte with value 1 
    {
       digitalWrite(ledPin, HIGH);
    }
    if (c == '0')
    {
       digitalWrite(ledPin, LOW);
    }
  }
}