Alternate operation of two motors depending on state of pressure switch.

Projects Programming
18

Give this a try:

int FLOAT_SWITCH_PIN = 2;
 int PRESSURE_SWITCH_PIN = 12;
//Motors pins:
 int PUMP_A_PIN = 7;
 int PUMP_B_PIN = 8;
 boolean alt = true;

void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(12, INPUT_PULLUP);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  Serial.begin(9600);
}

void loop() {
//when float switch at low, both motors will OFF:
  if (digitalRead(2)== LOW)
  {
   digitalWrite(7, HIGH);
   digitalWrite(8, HIGH);
   }

   
 if ( digitalRead(8)== HIGH && digitalRead(12) == HIGH && digitalRead(2) == HIGH)
     {
//motor at pin 7 is ON and at 8 is OFF when pressed pressure switch HIGH 1st time:
      if(alt == true)
    digitalWrite(7, LOW);
    digitalWrite(8, HIGH);
    else
//when second time pressure switch HIGH, motor at 8 will ON and at 7 will OFF:
    digitalWrite(7, HIGH);
    digitalWrite(8, LOW);
     }
  else
  {
   digitalWrite(7, HIGH);
   digitalWrite(8, HIGH);
   alt =! alt;
   }   
}