Piezo Vibration sensor as blow sensor to run DC motor

Projects General Guidance
7

I would dump the delays and have something like;

<before setup>
  int inertia1 = 0;  // the inertia countdown motor 1
  int inertia2 = 0;  // the inertia countdown motor 2

.....

  //I say..if <= sensorMin run one motor; if >= threshold run all

  if (sensorReading < 350)   { 
     if (inertia1  > 0)      { 
         inertia1 --;
     }
     else {
         digitalWrite (motor1, LOW);
     }
     if (inertia2  > 0) { 
         inertia2 --;
     }
     else     {
        digitalWrite (motor2, LOW);
     }
  }  // end below 350 if

  if (sensorReading > 350)   {
    inertia1 = 100;                 // reset motor1 spin inertia
    Serial.println ("Blow");
    Serial.println (threshold);
    digitalWrite (motor1,HIGH);
  }  // end if 350

 if (sensorReading > 550)    {
      inertia2 = 80;                  // reset motor2 spin inertia
      Serial.println ("Spin");
      Serial.println(sensorMin);
  //    digitalWrite (motor1,HIGH);  // should be running already from the last if
      digitalWrite (motor2,HIGH);
 }  // end if 550

delay(100);   // this * the inertia values is for the extra spin