Hello,
I new to the Arduino. I am trying to measure distance using the HC-SR04.
It says it is accurate to within .017 inches. My numbers are all over to the right of the decimal, For example .05 to .86.
If anyone sees anything wrong please let me know.
Thank you for any and all help,
Ken =(
// ---------------------------------------------------------------------------
// Example NewPing library sketch that does a ping about 20 times per second.
// ---------------------------------------------------------------------------
#include <NewPing.h>
#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 500 // 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.
}
void loop() {
delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
float uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
Serial.print("Depth: ");
Serial.print(uS / US_ROUNDTRIP_IN); // Convert ping time to distance in cm and print result (0 = outside set distance range)
Serial.println(" inches");
}
NewPingExampleKM.ino (1.14 KB)