// defines pins numbers
const int stepPin1 = 4; 
const int dirPin1 = 3;
const int stepPin2 = 6; 
const int dirPin2 = 5;
const int stepPin3 = 8; 
const int dirPin3 = 7;
const int stepPin4 = 10; 
const int dirPin4 = 9;
const int enablePin1 = 17;
const int enablePin2 = 15;
const int enablePin3 = 14; 
const int enablePin4 = 16;
String val;
int motor = 0; 
int steps = 0;
char instring[20]; // Room for 19 characters plus terminating null
int spos = 0; // Location in the array
int val1 = 0;
int val2 = 0;
int val3 = 0;

int id = 9;

//int water = 0;
//float h3po4 = 0;
 
void setup() {
  // Sets the two pins as Outputs
  Serial.begin(9600);
  pinMode(stepPin1,OUTPUT); 
  pinMode(dirPin1,OUTPUT);
  pinMode(stepPin2,OUTPUT); 
  pinMode(dirPin2,OUTPUT);
  pinMode(stepPin3,OUTPUT); 
  pinMode(dirPin3,OUTPUT);
  pinMode(stepPin4,OUTPUT); 
  pinMode(dirPin4,OUTPUT);
  digitalWrite(enablePin1, HIGH);
  digitalWrite(enablePin2, HIGH);
  digitalWrite(enablePin3, HIGH);
  digitalWrite(enablePin4, HIGH);
  
}
void loop() {

    if (Serial.available()) {
        char *bita, *bitb, *bitc;
        int c = Serial.read();
        switch (c) {
            case '\r': break; // ignore
            case '\n': 
                 spos = 0;
                 bita = strtok(instring, ",");
                 bitb = strtok(NULL, ",");
                 bitc = strtok(NULL, ",");
                 if (bita && bitb && bitc) {
                     val1 = atoi(bita);
                     val2 = atoi(bitb);
                     val3 = atoi(bitc);
                 }
                 // Three values collected in val1, val2 and val3
                 break;
            default:
                if (spos < 18) {
                    instring[spos++] = c;
                    instring[spos] = 0;
                }
        }
    }
id = val1;
motor = val2;
steps = val3;

if (id == 9 && motor == 1){
  digitalWrite(enablePin1, LOW);
  digitalWrite(dirPin1,HIGH); 
  for(int x = 0; x < steps; x++) {
    digitalWrite(stepPin1,HIGH); 
    delayMicroseconds(2500); 
    digitalWrite(stepPin1,LOW); 
    delayMicroseconds(2500); 
  }
    digitalWrite(enablePin1, HIGH);

    digitalWrite(dirPin1,LOW);
}
else if (id == 9 && motor == 2){
  digitalWrite(enablePin2, LOW);
  digitalWrite(dirPin2,HIGH); 
  for(int x = 0; x < steps; x++) {
    digitalWrite(stepPin2,HIGH); 
    delayMicroseconds(2500); 
    digitalWrite(stepPin2,LOW); 
    delayMicroseconds(2500); 
  }
    digitalWrite(enablePin2, HIGH);

    digitalWrite(dirPin2,LOW);
}
else if (id == 9 && motor == 3){
  digitalWrite(enablePin3, LOW);
  digitalWrite(dirPin3,HIGH); 
  for(int x = 0; x < steps; x++) {
    digitalWrite(stepPin3,HIGH); 
    delayMicroseconds(2500); 
    digitalWrite(stepPin3,LOW); 
    delayMicroseconds(2500); 
  }
  digitalWrite(enablePin3, HIGH);
  digitalWrite(dirPin3,LOW);
} 
else if (id == 9 && motor == 4){
  digitalWrite(enablePin4, LOW);
  digitalWrite(dirPin4,HIGH); 
  for(int x = 0; x < steps; x++) {
    digitalWrite(stepPin4,HIGH); 
    delayMicroseconds(2500); 
    digitalWrite(stepPin4,LOW); 
    delayMicroseconds(2500); 
  }
  digitalWrite(enablePin4, HIGH);
  digitalWrite(dirPin4,LOW); 

}
id = 0;
motor = 0;
steps = 0;
}