Motion sensing spider dropper

// constants won't change. They're used here to set pin numbers:
const int PIRpin = 2;
//const int LEDpin =1;  //digispark
const int LEDpin =13; //UNO
const int limitPin = 7;     // the number of the pushbutton pin
//const int motorFWD = 0; //digispark
// const int motorREV = 4; //digispark

const int motorFWD = 5; //UNO
const int motorREV = 6; //UNO
const int frightDelay = 10000; //delay between actions

const int acceleration = 25; //how fast the motor starts to int acceleration delay in ms 


// variables will change:
int limitState = 1;         // variable for reading the pushbutton status
int PIRstate = 0;
int MOTdirection = 1;
int PWMValue = 200; // starting PWM value

void setup() {
  // initialize the LED pin as an output:
  pinMode(LEDpin, OUTPUT);
  pinMode(PIRpin, INPUT);
  pinMode(motorFWD, OUTPUT);
  pinMode(motorREV, OUTPUT);
  pinMode(limitPin, INPUT_PULLUP);
}

void loop() {

PIRstate = digitalRead(PIRpin);

  if (PIRstate == HIGH ) {
    PWMValue=200;
    digitalWrite(LEDpin, HIGH);
    do
    {
      limitState = digitalRead(limitPin); 
      driveMotor();
    } while (limitState != 0); //state is 1 button is not activated

      if (MOTdirection ==0){MOTdirection = 1;} else { MOTdirection = 0;}

stopMotor();
delay(500);
lockMotor();
delay(1000);
stopMotor();
delay(frightDelay);
 
 }
 digitalWrite(LEDpin, LOW);
}

void driveMotor(){

if (PWMValue < 255){++PWMValue;}  
delay(acceleration);
if (MOTdirection ==1)
{ 
analogWrite(motorFWD, PWMValue);
analogWrite(motorREV, 0);
}
else
{
analogWrite(motorFWD, 0);
analogWrite(motorREV, PWMValue);
}
}

void stopMotor(){
analogWrite(motorFWD, 0);
analogWrite(motorREV, 0);
}

void lockMotor(){
digitalWrite(motorFWD, 1);
digitalWrite(motorREV, 1);
}