Using HC-SR04 to measure speed.

Projects General Guidance
1

Hey guys I have got my device to measure distance so I know there is a way to save two measurements in a row and convert this to speed by working out how much distance has closed in between range finder and the object. Can anyone point me in the right direction code-wise to make some more progress? Any help is greatly appreciated, thanks guys

2

Yes . I know where to find it Google.

3

I've been trying that :frowning: can't find it anyway... I've tried quite a few different searches too

4

I found ten this morning on that subject so don't tell me they're not there.
If you are using arduino ALL searches MUST begin with the word "arduino" and the second word must be the specific name of your sensor and the third word should be "example" or "code" or both.

5

Post your code!

6

I've been using this to get the distance

// ---------------------------------------------------------------------------
// Example NewPing library sketch that does a ping about 20 times per second.
// ---------------------------------------------------------------------------

#include <NewPing.h>
#define TRIGGER_PIN 4 // 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 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.
}

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: ");
Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance in cm and print result (0 = outside set distance range)
Serial.println("cm");
}

7

using your method of searching I found a lot of useful stuff! Thanks for the advice on how to find this stuff!

8

Did you follow my instructions for the Google search?

9

Your welcome.