long l;
long i;
float SPEED = 0;
void setup() {
pinMode(3, INPUT_PULLUP);
pinMode(2, INPUT_PULLUP);
Serial.begin(9600);
attachInterrupt(digitalPinToInterrupt(2), sens, FALLING);
//i = millis();
}
void sens() {
if (digitalRead(3) == LOW) {
i = millis();
}
if (digitalRead(2) == LOW) {
l = millis();
SPEED = (l - i)/ 10000;
Serial.print(SPEED);
Serial.println("m/s");
}
}
void loop() {
}