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/* | |
Ultrasonic sensor Pins: | |
VCC: +5VDC | |
Trig : Trigger (INPUT) - Pin11 | |
Echo: Echo (OUTPUT) - Pin 12 | |
GND: GND | |
*/ | |
int trigPin = 11; // Trigger | |
int echoPin = 12; // Echo | |
long duration, cm, inches; | |
void setup() { | |
//Serial Port begin | |
Serial.begin (9600); | |
//Define inputs and outputs | |
pinMode(trigPin, OUTPUT); | |
pinMode(echoPin, INPUT); | |
} | |
void loop() { | |
// The sensor is triggered by a HIGH pulse of 10 or more microseconds. | |
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse: | |
digitalWrite(trigPin, LOW); | |
delayMicroseconds(5); | |
digitalWrite(trigPin, HIGH); | |
delayMicroseconds(10); | |
digitalWrite(trigPin, LOW); | |
// Read the signal from the sensor: a HIGH pulse whose | |
// duration is the time (in microseconds) from the sending | |
// of the ping to the reception of its echo off of an object. | |
pinMode(echoPin, INPUT); | |
duration = pulseIn(echoPin, HIGH); | |
// Convert the time into a distance | |
cm = (duration/2) / 29.1; // Divide by 29.1 or multiply by 0.0343 | |
inches = (duration/2) / 74; // Divide by 74 or multiply by 0.0135 | |
Serial.print(inches); | |
Serial.print("in, "); | |
Serial.print(cm); | |
Serial.print("cm"); | |
Serial.println(); | |
delay(250); | |
} |
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