int in1 = 7; 
int in2 = 6; 
int ConA = 5;  
              
void setup() 
{
Serial.begin(9600);
pinMode(in1, OUTPUT); 
pinMode(in2, OUTPUT);
pinMode(ConA, OUTPUT);
}

void On_Pump(){              
digitalWrite(in1, HIGH);
digitalWrite(in2, LOW);
analogWrite(ConA,100);
}

void Off_Pump(){
digitalWrite(in1, LOW);
digitalWrite(in2, LOW);
analogWrite(ConA,0);
}

void loop() 
{
On_Pump(); 
delay(2000);
Off_Pump();
delay(1000);

}