Arduino Ping Pong Ball Cannon

1/*
2 * Ping Pong Ball Cannon
3 * 2019 - Gord Payne
4 * 
5 */
6  #include <Servo.h>
7
8Servo servo;
9
10int motorPin = 6; // flywheel motors
11int  servoPin = 8; // autofeeder servo
12int potPin = A0; // potentiometer for speed  adjustment
13int potVal;
14int speedVal; // scaled speed value for motor (potVal/4);
15char  theVal;
16
17void setup() {
18  Serial.begin(9600);
19  pinMode(motorPin, OUTPUT);
20  pinMode(potPin, INPUT);
21
22}
23
24void loop() {
25  potVal = analogRead(potPin);
26  speedVal = map(potVal / 4, 0, 255, 80, 220); // you can adjust as appropriate  for your setup
27  Serial.print(speedVal);
28  if (Serial.available() > 0) {
29    theVal = Serial.read();
30
31
32  }
33  switch (theVal) {
34    case '1':  // If '1' was received
35      analogWrite(motorPin, speedVal); // turn the motor  ON
36      delay(2000);
37      feedBall(); // feed a ball into the flywheels
38      digitalWrite(motorPin,LOW);
39      break;
40    case '0': // If '0' was  received
41      digitalWrite(motorPin, LOW); // turn the motor OFF
42      break;
43    default:
44      break;
45
46  }
47
48}
49
50void feedBall(){
51  servo.attach(servoPin);
52      delay(20);
53      servo.write(10);
54      delay(400);
55     for (int  i = 0; i <= 110; i++) { // push the ball into the flywheels
56      servo.write(i);
57      delay(5);
58      }
59      delay(100);
60     for (int i = 110; i >= 0;  i--) { // retract the feeder for the next ball
61      servo.write(i);
62      delay(5);
63      }
64      servo.detach();
65}
66