Pins - On/Off

hi - i'm trying write program turns switch on , off (one connected air compressor, vacuum) serial port. able turn vacuum on, not off, if first turn on, allow delay , turn off.


my code below:


const byte air = 9; //z-axis
const byte vac = 10; //vacuum
void setup()
{
  // initialize digital pin 12 output.
  // initialize digital pin 13 output.
  pinmode(air, output);
  pinmode(vac, output);
 
  serial.begin(115200);

}


void loop()
{
 char x= serial.read();
 
 while (x == 'a' || x == 'b')
 {
   if (x == 'a')
   {
    zmotionon();
    suctionon();
   }
   if (x == 'b')
   {
    zmotionoff();
    suctionoff();
   }
 }
}

void zmotionon()
{
  digitalwrite(air, high);   // extend air cylinder
  delay(3000);              // wait second   
}

void suctionon()
{
  digitalwrite(vac, high);   // open vacuum line manifold
  delay(3000);              // wait second
}

void zmotionoff()
{
  digitalwrite(air, low);    // retract air cylinder
  delay(3000);              // wait second
}

void suctionoff()
{
  digitalwrite(vac, high);   // open vacuum line manifold
  delay(1000);              // wait second
  digitalwrite(vac, low);    // shut off vacuum line manifold
  delay(3000);              // wait second
}

tell how out of while loop.

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