int vss;
int last_vss;
float rate1;
float diff;
float rate2;
unsigned long lastTime = 0;

unsigned long dt = 100; // dt in milliseconds

void setup() 
{
  Serial.begin(9600);
 last_vss = 0;
}
void led(){
  digitalWrite(10, HIGH);
if(vss<10){
    digitalWrite(10, LOW);
    loop();
  }
}
void loop() 
{

  vss = map(analogRead(A2), 0, 1023, 0, 120);
  if (millis() - lastTime  >= dt)   // wait for dt milliseconds
  {
    lastTime = millis();
    diff= last_vss-vss;
    rate1 = diff/dt;
    rate2 = (rate1/36)*1000;
    last_vss = vss;
    
    Serial.println(rate2);
    Serial.println(vss); 
  }
if(rate2 >5.00){
 led();
}
}