Main

// MAIN FILE FOR RC CAR

#define enA 9   // Connects the right wheel to the PWM signal
#define enB 3   // Connects the left wheel to the PWM signal
#define inA 6   // inA & inB are inputs for the right wheel
#define inB 7
#define inC 5   // inC & inD are inputs for left wheel
#define inD 4   


void setup() {
    // Sets up pins as output pins
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  pinMode(inA, OUTPUT);
  pinMode(inB, OUTPUT);
  
    // Set initial rotation direction
  digitalWrite(inA, LOW);
  digitalWrite(inB, HIGH);
  digitalWrite(inC, LOW);
  digitalWrite(inD, HIGH);
  
    // HC Setup
  Serial.begin(9600);
}


int input;
String readString;
int outputPower = 5;      // Sets the initial power


void loop() {
  
  int potValue =  outputPower;    //analogRead(A0);   // Read potentiometer value
  int pwmOutput = map(potValue, 0, 1023, 0 , 255);    // Map the potentiometer value from 0 to 255
  analogWrite(enA, pwmOutput);                        // Send PWM signal to enable pin
  analogWrite(enB, pwmOutput);
  
  
  while (Serial.available()) {    // While there is something to read in...
    delay(2);                          // delay to allow byte to arrive in input buffer
    char c = Serial.read();            // pulls ina character 
    readString += c;                   // and adds it to the string
  }
  
  if(readString.length()) {       // Checks to make sure readString isn't empty
    input = readString.toInt();   
  }
  
  if(input == 1) {               // 1 - Spins the wheels in one direction
    digitalWrite(inA, HIGH);
    digitalWrite(inB, LOW);
    digitalWrite(inC, HIGH);
    digitalWrite(inD, LOW);
  }else if (input == 0) {        // 0 - Spins the wheels in another direction
    digitalWrite(inA, LOW);
    digitalWrite(inB, HIGH);
    digitalWrite(inC, LOW); 
    digitalWrite(inD, HIGH);
  }else if (input == 2) {        // 2 - Stops the wheels
    outputPower = 0;
  }else if (input == 3 && outputPower <= 900) {   // 3 - Increases the power, until it is at max
    outputPower += 100;
  }
  delay(500);
}