can arduino serial.read() values??

Using Arduino Programming Questions
2

Depends on how you send it.

Imagine you send it in ASCII, meaning you'll receive a string.

#define DESCRIPTOR    'P'
char temp[4];


temp[3] = '\0';


if (Serial.available() > 5) { //<descriptor><value><value><value><end character>
   if (Serial.read() == DESCRIPTOR) { //first is correct.
      for(int i = 0; i<3; i++) {
         temp[i] = Serial.read();
      }
   if (Serial.read() == '\n') { // the string is correct... sort of ... 
      pwm = atoi(temp);
   }

analogWrite(pwm); //there you go...

However, you can avoid that if you control the software that sends the command. What are you using to send the command?