Hi,
I have a problem with NewPing Library, always return Ping : 0cm when i lunch NewPingExample code.
I am on Arduino Pro Mini 5V ATMega 328, the Sonic sensor is correct, because if i use the HY-SRF05 test code, i have got values, with the same pins.
I don't understand what happen.
Working code for testing sonic sensor
const int TRIG_PIN = 7;
const int ECHO_PIN = 8;
void setup() {
// initialize serial communication:
Serial.begin(9600);
pinMode(TRIG_PIN,OUTPUT);
pinMode(ECHO_PIN,INPUT);
}
void loop()
{
long duration, distanceCm, distanceIn;
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
duration = pulseIn(ECHO_PIN,HIGH);
// convert the time into a distance
distanceCm = duration / 29.1 / 2 ;
distanceIn = duration / 74 / 2;
Serial.print(distanceIn);
Serial.print("in, ");
Serial.print(distanceCm);
Serial.print("cm");
Serial.println();
}
No resut with NewPing Library
#include <NewPing.h>
#define TRIGGER_PIN 7 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 8 // 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(TRIGGER_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
}
void loop() {
delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
Serial.print("Ping: ");
Serial.print(sonar.ping_cm()); // Send ping, get distance in cm and print result (0 = outside set distance range)
Serial.println("cm");
}
Anybody help me ?
