const int Button1 = 2; // Input from Button 1, Purge
const int Button2 = 4; // Input from Button 2, Flow Vairable
const int Button3 = 7; // Input from Button 3, Flow 100%
const int Bank1 = 3; // Output to Bank 1
const int Bank2 = 11; // Output to Bank 2

int Purge; // Set vairable for Purge button
int FlowCyc; // Set vairable for Flow Cycle
int Flow100; // Set vairable for Flow 100%

void setup() {
  // put your setup code here, to run once:
  pinMode(Button1, INPUT_PULLUP); // Read ground signal from button
  pinMode(Button2, INPUT_PULLUP); // Read ground signal from button
  pinMode(Button3, INPUT_PULLUP); // Read ground signal from button
  TCCR2B = TCCR2B & B11111000 | B00000111; //Set pin 3 and 11 PWM frequency to 31hz
}

void loop() {
  // put your main code here, to run repeatedly:
  Purge = digitalRead(Button1); // Set Purge to read signal from Button1
  FlowCyc = digitalRead(Button2); // Set FlowCyc to read signal from Button2
  Flow100 = digitalRead(Button3); // Set Flow100 to read signal from Button3

  // If Purge (Button 1) is pushed, pulse both banks at 50% duty cycle for 1 second
  if (Purge == 0) {
    analogWrite(Bank1, 127);
    analogWrite(Bank2, 127);
    delay(1000);
  }

  // If Flow Cycle (Button 2) is pressed, pulse each bank at each duty cycle for 2 seconds
  if (FlowCyc == 0) {

    // 50% dutycycle for 2 seconds
    // Pulse bank 1
    analogWrite(Bank1, 127);
    analogWrite(Bank2, 0);
    delay(2000);
    // Pulse bank 2
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 127);
    delay(2000);

    // 60% dutycycle for 2 seconds
    // Pulse bank 1
    analogWrite(Bank1, 153);
    analogWrite(Bank2, 0);
    delay(2000);
    // Pulse bank 2
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 153);
    delay(2000);

    // 75% dutycycle for 2 seconds
    // Pulse bank 1
    analogWrite(Bank1, 191);
    analogWrite(Bank2, 0);
    delay(2000);
    // Pulse bank 2
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 191); 
    delay(2000);

    // 85% dutycycle for 2 seconds
    // Pulse bank 1
    analogWrite(Bank1, 217);
    analogWrite(Bank2, 0);
    delay(2000);
    // Pulse bank 2
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 217);
    delay(2000);

    // 100% dutycycle for 2 seconds
    // Pulse bank 1
    analogWrite(Bank1, 255);
    analogWrite(Bank2, 0);
    delay(2000);
    // Pulse bank 2
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 255);
    delay(2000);
  }

  // If Flow 100% (Button 3) is pushed, flow each bank at 100% duty cycle for 10 seconds
  if (Flow100 == 0) {
    analogWrite(Bank1, 255);
    analogWrite(Bank2, 0);
    delay(10000);
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 255);
    delay(10000);
  }

  // If no button is pressed, both banks remain inactive
  else {
    analogWrite(Bank1, 0);
    analogWrite(Bank2, 0);
  }
}