Distance sensor messure strange values

[crazy_penguin]

Hi Moshe Livne,

I disconnect the radio device and keep the US-sensor connected and use the following code.

#include <NewPing.h>

#define TRIGGER_PIN  6  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     5  // 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(500);                      // 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: ");
  Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance in cm and print result (0 = outside set distance range)
  Serial.println("cm");
}

I got the following results:

Ping: 306cm
Ping: 0cm
Ping: 308cm
Ping: 0cm
Ping: 308cm
Ping: 0cm
Ping: 308cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm
Ping: 0cm
Ping: 307cm

[crazy_penguin]

Hi all,

I am really wondering whats going wrong here. I made some changes to the code and now I get this result:

Ping: cm
Ping: 0cm
Ping: 0cm
Ping: 0cm
Ping: 2cm
Ping: 0cm
Ping: 0cm
Ping: 0cm
Ping: 1cm
Ping: 0cm
Ping: 0cm
Ping: 0cm
Ping: 0cm
Ping: 0cm
Ping: 0cm
Ping: 16cm
Ping: 0cm
Ping: 0cm
Ping: 0cm

The distance between sensor and wall is about 75cm.

I took back any chagnes I made. Without any effect.
I try now use the NewPing version 1.6 library. No effect.

Current code:

#include <NewPing.h>

#define TRIGGER_PIN  6  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     5  // 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(2000);                    // 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");
}

I there any way to check I the hardware is bad or may have some defects?

[Moshe Livne]

@crazy_penguin can you please try to point the sensor straight at the wall (not down) and clear anything from the sides? you might get echoes. but this is a bit far fetched. mine is this one http://www.aliexpress.com/item/Free-shipping-1pcs-Ultrasonic-Module-HC-SR04-Distance-Measuring-Transducer-Sensor-for-Arduino-Samples-Best-prices/1967936408.html?aff_platform=aaf&aff_trace_key=34543821268212384&sk=bUBEAqbMv%3A&cpt=1435219216767
it works reasonably reliably

[crazy_penguin]

@Moshe Livne I order the HC-SR04 Module as well to make sure where the problem is.
I also order aother Arduino Nano.

[hek]

@crazy_penguin

Your module (on the pictures) looks really strange. What type is it?

[crazy_penguin]

@hek DYP-ME007Y

[hek]

Check out this:
http://forum.arduino.cc/index.php?topic=153700.0

[crazy_penguin]

@hek Thanks. I will check out this and will tell you the result.

[crazy_penguin]

OK. this threat (http://forum.arduino.cc/index.php?topic=153700.0) is very usefull. I will try out some hints and tell you my result.

Thank to all for now.

[crazy_penguin]

Hi there,
it's me again.

I tried some things which read in the arduino froum (http://forum.arduino.cc/index.php?topic=153700.0) without any good result.
I also get a new sensor and there is still no change of it's behaviour.

I read in the forum that it could be a sensor that uses RX/TX to send its information.
Does any one know something about that?