48 lines
753 B
Arduino
48 lines
753 B
Arduino
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// Ultrasonic sensor
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#include <SR04.h>
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#define red 3
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#define yellow 4
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#define green 5
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#define echo 9
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#define trig 8
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SR04 sr04 = SR04(echo, trig);
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long length;
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void turnOff() {
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digitalWrite(red, LOW);
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digitalWrite(yellow, LOW);
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digitalWrite(green, LOW);
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}
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void turnOn(int LED) {
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turnOff();
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digitalWrite(LED, LOW);
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}
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void setup(){
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Serial.begin(9600);
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pinMode(red, OUTPUT);
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pinMode(yellow, OUTPUT);
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pinMode(green, OUTPUT);
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pinMode(echo, INPUT);
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pinMode(trig, OUTPUT);
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}
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void loop() {
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length = sr04.Distance();
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Serial.println("Distancia: ");
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Serial.println(length);
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Serial.println("cm");
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if(length < 8){
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turnOn(red);
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} else if (length < 15){
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turnOn(yellow);
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} else {
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turnOn(green);
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}
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delay(100);
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}
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