#define trigPin 9 #define echoPin 8 void setup() { Serial.begin (9600); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); } void loop() { long duration, distance; digitalWrite(trigPin, LOW); // Added this line delayMicroseconds(2); // Added this line digitalWrite(trigPin, HIGH); …

Ultrasonic Sensor

Vincent19 July 6, 2013, 4:29pm 7

Ok to be clear, why should I divide by 20000 ?

Thanks