Arduino Sonar Distance
// ---------------------------------------------------------------------------
// Example NewPing library sketch that does a ping about 20 times per second.
// ---------------------------------------------------------------------------
#include <NewPing.h>
// LED Colors
int ledcolor = 0;
int a = 1000; //this sets how long the stays one color for
int red = 2; //this sets the red led pin
int green = 3; //this sets the green led pin
int blue = 4; //this sets the blue led pin
#define TRIGGER_PIN 12 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 11 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
void setup() {
Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(blue, OUTPUT);
}
void loop() {
delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
Serial.print("Ping: ");
int distanceCMs = (uS / US_ROUNDTRIP_CM);
Serial.print(distanceCMs); // Convert ping time to distance and print result (0 = outside set distance range, no ping echo)
if (distanceCMs < 5) {
showGreen();
}
else if (distanceCMs < 15) {
showYellow();
}
else {
showRed();
}
Serial.println("cm");
}
void clearValues() {
digitalWrite(red, LOW);
digitalWrite(blue, LOW);
digitalWrite(green, LOW);
}
void showGreen(){
clearValues();
digitalWrite(green, HIGH);
}
void showRed() {
clearValues();
Serial.print("Red");
analogWrite(red, 204);
}
void showYellow() {
clearValues();
analogWrite(red, 190);
digitalWrite(green, HIGH);
}