Servo motor activation with pressure sensor
You don't tell what pressure sensor are you using, but suppose that a call to readPressure() will give as pressure as an int

#include &lt;Servo.h&gt;

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position

void setup()
{
    myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop()
{
    int pressure = readPressure();

    if(pressure &gt;= 10 &amp;&amp; pressure &lt;= 70) {
        //  Pressure is in range. Move the servo.
        for(pos = 0; pos &lt;= 30; pos += 1) { // goes from 0 degrees to 180 degrees
            // in steps of 1 degree
            myservo.write(pos);              // tell servo to go to position in variable 'pos'
            delay(5);                       // waits 15ms for the servo to reach the position
        }

        for(pos = 30; pos&gt;=0; pos-=1) {   // goes from 180 degrees to 0 degrees
            myservo.write(pos);              // tell servo to go to position in variable 'pos'
            delay(5);                       // waits 15ms for the servo to reach the position
        }
    }

    //  Wait for another 1.5 sec before next loop().
    delay(1500);
}


Of course, you have to complete the code with the actual sensor calls.