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One day my best friend noticed that she was not spending much time with her cats and she felts a bit sorry.

This is why I am starting this project.

Step 1: Parts

Arm ... You just prepare only the part

- WIZwiki-W7500

- HC-SR04(Ultrasonic)

- SG-90(Servomotor)

- Jumper cable

Step 2: Schematic

Step 3: Source Code

mbed :mbed link

#include "mbed.h"<br>#include "stdlib.h"  //For rand function 
#include "Servo.h"
#include "HCSR04.h"
HCSR04 sensor(D11, D12); //(Trig Pin, Echo Pin) 
Servo myservo(D6);
int main()
{
  	int number = 0;
        while(1){ 
		long d = sensor.distance(1);
        	printf("d = %d\r\n",d);   
		myservo = 0.5;   
		if(d<=25)    //25cm
	        {
			number = rand()%11;  //0~10    
			double a = number*0.1;
			printf("%d = %3f\r\n",number,a);                      
			myservo = number*0.1;
		}    
	wait(0.2); 
    }
}

Step 4: Semblance

The size is greater than or equal to Card.

Step 5: Video

The cats were constantly coming and going.

You can make it easier.

If you have a question, please send me email(iriankim1225@gmail.com) or write the comment about this project

<p>Awesome project, I love this, I think i'll make this as my next project, if I do, I'll send you the picture. Thanks for sharing!</p>
<p>I love this idea but the WIZwiki is difficult to get. Can you modify this instructional to use a Arduino?</p>
<p>Yes, Arduino UNO can hook up the the Ultrasonic Range Finder and a servo, the code should be easy enough to write, you can look it up. Also, in case you didn't know this already, servos on the Arduino require a library, that can be found on this page: <a href="http://playground.arduino.cc/ComponentLib/Servo" rel="nofollow">http://playground.arduino.cc/ComponentLib/Servo</a> I hope this helps, even though it's a little late.</p>
<p>I will test the arduino as soon as possible. wait for me^^</p>
<p>Show me the cat!</p>
<p>sorry :), you can't see the cats. Just test video,^^</p>
<p>Wow!</p>
<p>Thanks you</p>
<p>32-bit ARM to shake something and measure distance ?! huge overkill</p>

About This Instructable

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Bio: I am SoC engineer^^
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