// two 12 VDC solenoids
int S1 = 4;                            // digital pin 4 solenoid 1
int S2 = 2;                            // digital pin 2 solenoid 2
int val;
int count;                                    

void setup()
{  
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  Serial.begin(9600);                       // begin serial communication with the computer at 9600 bps                         
}

void loop()
{                                          // start the loop

for (int count=0; count <= 3; count++)         // flip solenoids back and forth three times
{
    digitalWrite(S1, HIGH);
    digitalWrite(S2, LOW); 
    delay(1000);
    digitalWrite(S1, LOW);
    digitalWrite(S2, HIGH); 
    delay(1000);
}
for (int count=0; count <= 3; count++)          // flip solenoids back and forth three times only faster
{
    digitalWrite(S1, HIGH);
    digitalWrite(S2, LOW); 
    delay(500);
    digitalWrite(S1, LOW);
    digitalWrite(S2, HIGH); 
    delay(500);
}
for (int count=0; count <= 2; count++)        // flip solenoids back and forth two times, even faster
{
    digitalWrite(S1, HIGH);
    digitalWrite(S2, LOW); 
    delay(250);
    digitalWrite(S1, LOW);
    digitalWrite(S2, HIGH); 
    delay(250);
    
    digitalWrite(S1, HIGH);              //rat-a-tat-tat. Listen to the beat!
    delay(100);
    digitalWrite(S1, LOW); 
    delay(100);                           
    digitalWrite(S1, HIGH);             
    delay(100);
    digitalWrite(S1, LOW); 
    delay(100);
    digitalWrite(S2, HIGH);
    digitalWrite(S1, HIGH); 
    delay(250);
    digitalWrite(S2, HIGH);
    digitalWrite(S1, HIGH); 
    delay(250);
}
 }