user6367: I have three devices for making a motion activated security camera system:

this is the camera : LINK  OV 7670  
this is the SD Card module: LINK
and a basic motion Sensor: PIR with 3 pin 

I have an Arduino UNO and an Arduino Mega 2560.
I can connect the SD card and sensor, they work fine but I cannot connect the camera as there are not enough pins for it on UNO. 
Is there a chance to connect all of them without any additional device? 
I saw some working project with additional device (arducam) but I do not have much money to spend on this project.

user6301: This camera module requires the use of additional hardware, as the camera and Arduino operating frequencies differ, which can result in loss of synchronization and changes to the image, and other connection problems.
Thus, we must use an integrated circuit intermediary, making the connection between the camera and the Arduino. The function of this chip is to receive the camera information, store them and then send them to the Arduino using the digital doors, much faster than if we used the serial communication.
An example of an integrated circuit that could be used is AL422, suitable for treating a video signal, which also is embedded in some OV7670 modules.
Looking like the connection pins behave in 7670, your module should be equal to it. So spare pins to be able to make other necessary connections.

Would better check the connection through the datasheets:
7670 datasheet
AL422 datasheet
An example of project
But to answer your question; You'll need to purchase a piece more if you don't have AL442.
Regards,

6367: <p>I have three devices for making a motion activated security camera system:</p>

<ul>
<li>this is the camera : <a href="http://urun.gittigidiyor.com/ev-elektronigi/arduino-pic-kamera-modulu-ov7660-134509055" rel="nofollow">LINK</a>  OV 7670  </li>
<li>this is the SD Card module: <a href="http://urun.gittigidiyor.com/ev-elektronigi/arduino-sd-kart-modulu-140174113?opi=132220334" rel="nofollow">LINK</a></li>
<li>and a basic motion Sensor: PIR with 3 pin </li>
</ul>

<p>I have an Arduino UNO and an Arduino Mega 2560.</p>

<p>I can connect the SD card and sensor, they work fine but I cannot connect the camera as there are not enough pins for it on UNO. </p>

<p>Is there a chance to connect all of them without any additional device? </p>

<p>I saw some working project with additional device (arducam) but I do not have much money to spend on this project.</p>
 6301: <p>This camera module requires the use of additional hardware, as the camera and Arduino operating frequencies differ, which can result in loss of synchronization and changes to the image, and other connection problems.</p>

<p>Thus, we must use an integrated circuit intermediary, making the connection between the camera and the Arduino. The function of this chip is to receive the camera information, store them and then send them to the Arduino using the digital doors, much faster than if we used the serial communication.</p>

<p>An example of an integrated circuit that could be used is AL422, suitable for treating a video signal, which also is embedded in <strong>some</strong> OV7670 modules.</p>

<p>Looking like the connection pins behave in 7670, your module should be equal to it. So spare pins to be able to make other necessary connections.</p>

<p><img src="https://i.stack.imgur.com/c40y9.jpg" alt="7670 with AL422 pin"></p>

<p>Would better check the connection through the datasheets:</p>

<p><a href="https://www.openimpulse.com/blog/document-viewer/?pdf_file=OV7670-CMOS-VGA-Camera-Datasheet.pdf" rel="noreferrer">7670 datasheet</a></p>

<p><a href="https://www.openimpulse.com/blog/document-viewer/?pdf_file=AL422-FIFO-Datasheet.pdf" rel="noreferrer">AL422 datasheet</a></p>

<p><a href="http://nicolasfley.fast-page.org/?page_id=35" rel="noreferrer">An example of project</a></p>

<p>But to answer your question; You'll need to purchase a piece more if you don't have AL442.</p>

<p>Regards,</p>
