unsigned long Timer1 =10;
  unsigned long Time_set1;
  unsigned long sensor = A0;
     unsigned long start_time = 0;
     unsigned long end_time = 0;
     float steps_old=0;
     float temp=0;
     float rps=0;
  void setup() {
  // put your setup code here, to run once:

}

void loop() {
digitalWrite(7,LOW);
for(int x = 0; x < Timer1;x++) {
digitalWrite(8,HIGH);
delayMicroseconds(10);
digitalWrite(8,LOW);
delayMicroseconds(10);}


   start_time=millis();
    end_time=start_time+10;
     while(millis()<end_time)
     {
     if(digitalRead(sensor))
     {
     while(digitalRead(sensor));
     }}
}