OV7670 Without FIFO Very Simple Framecapture With Arduino, Black/white





Introduction: OV7670 Without FIFO Very Simple Framecapture With Arduino, Black/white

This instructable is for all the people struggling to just take a picture/grab a frame with their OV7670 without FIFO. I made this purely as an introduction. I do not yet posses the necessary coding skills to make a really great description. This was made to hopefully save some people a lot of the hours I used researching the OV7670 wanting to see if it worked.

All the coding provided is copied from these links:

http://forum.arduino.cc/index.php?topic=159557.0 (From a really cool guy but obviously not a fan of the arduino IDE or windows)

http://embeddedprogrammer.blogspot.dk/2012/07/hack... (Provides a lot of usefull information for understanding how the OV7670 works)

http://privateblog.info/arduino-uno-i-kamera-ov767... (is in russian, but with google translate you can actually extract some useful information)

Other useful documents are captured in the rar file.

Step 1: Identify Your Camera

This might be a little redundant but before you get down to the nitty-gritty make sure that the camera you bought is the one without FIFO. I bought mine from http://www.dx.com/p/jtron-ov7670-300kp-vga-camera-.... If your pins mention fifo or you do not have 18 pins for exits this is not the tutorial for you! Btw, if you are thinking about buying the OV7670 and you don't do coding let me save you some time. Spend a more little money and go for one that is better supported by the community for non-coders.

Step 2: Connecting the Pieces

The OV7670 is not rated for voltages above 3.0v. Hence the voltage divider for the XCLK. Futhermore the OV7670 does not provide higher voltages than 3.0 which is a little low to be sure the arduino reads the input as high (it starts at 3.0v). Therefore we connect pull-up resistors.

Step 3: Upload Sketch to Arduino

The sketch is borrowed from this link:


and put together in the ino file I uploaded (From_Computernerd).

Just insert the ino file in the Arduino IDE and upload it. Don't mind that it does not recognize some libraries in the beginning of the file. If it bothers you, comment the whole line out with //

Step 4: Different Option to "grab" Picture

If you only care about making the OV7670 work, proceed to the next step.

This is just to inform people of some of the different options to retrieve the pictures from the Arduino. I tried using the framegrabber from ComputerNerd:


It seems to be written in UNIX/Linux. Hence I tried downloading the MinGW, which should be able to run the code. After adding several packages in MinGW I had to stop because MinGW does not contain the termios.h library which is used in the code.

Another option to run GNU in windows is Cygwin. In Cygwin you also install packages with different libraries. I tried running the code installing new packages whenever Cygwin told me a library was missing. In the end I was able to compile an exe file but it wouldn't run because allegedly cygjpeg-8.dll and cygSDL-1-2-0.dll was missing even though I had installed both packages.

Finally abandoning all hope of running the "original" framegrabber I found a russian website where a guy had made his own framegrabber in java instead.

Step 5: 1. Half.

-Create a new folder on your c drive called out, like c:\out. This is where the pictures will end up.

-Download and install java SDK 32bit (don't install the 64 bit version even if your system is 64 bit) I've tested this with version 8u74.(I've included it as a rar-file because it wouldn't let me upload the exe-file)

-Find out what USB port your Arduino is connected to, something like COM3 or COM4. Check pictures to understand how.

-Depending on what port number your Arduino is connected to, download the corresponding file: COM1 = com_1.rar etc.

Step 6: 2. Half.

-Go to the "bin" folder, where you installed the Java SDK. By default it should be C:\Program Files (x86)\Java\jdk1.8.0_74\bin.

-Unpack your corresponding com_#.rar files in the directory. Check picture for help. (it might ask for adm. permission)

-Download and extract the Extra.rar file. The "win32com.dll" is placed in the "...\jdk1.8.0_74\jre\bin" direktory.

the "comm.jar" in "...\jdk1.8.0_74\jre\lib\ext" and the "javax.comm.properties" in the "...\jdk1.8.0_74\jre\lib" directory.

-Open cmd

-Open the folder wherein the code is (mine is): cd C:\Program Files (x86)\Java\jdk1.8.0_74\bin

Write: java code.SimpleRead

Enjoy! (It isn't much but at least you got it working)

Step 7: Troubleshooting and Pictures

-If your cmd does not "FIND" images try switching the USB of the arduino from a USB2.0 to a USB3.0 (blue socket) or vice versa.

-If your cmd does not "FIND" images or if you recieve SCRAMBLED pictures, you need to edit the ino file. Edit the line: wrReg(0x11, 12);

try changng the 12 to 11 or 10 or 9 or 13. Upload it to the arduino and run the cmd code again.

Good luck!

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Hello everyone! I have a question... How I disable all automatics funcions (night mode, gamma control, white balance... etc) on the program code? I don't need a sharp image, I need the value of each pixel in the most "crude" form possible, a pixel tonality (white scale) in number. I already have this function by the way (the value pixel ranges from 0 to 254), but this automatics adjusts are messing up my results. Can anyone help me? Thanks!


I have bouth a OV7670 camera module.

I have installed the code and ran it again and it is still "looking for image". What can I do?

I have tried the connections to SIOC-A4/A5 or SIOD to A5/A4 and no connection to HREF. I have been trying it for last 3 weeks but in vain. Do help me out to complete the module...

To figure out the correct value for register 0x11 use this on the loop and find the best image

void loop(){

while (1){

uint8_t x=63;

do {

wrReg(0x11, x);


captureImg(320, 240);




You sir are brilliant! My camera also worked pretty well at value 56. Register 11 is CLKRC, bit 6 is use external clock with prescaler of 16 (whatever that does).

After I moved the camera, the clkrc value of 40 worked better. I think this value needs to be understood a bit more, than just picking a random one.

If you are getting an image, then the A4/A5 wiring is correct.

I used the ebay level shifters as buffers between the Uno and the OV7670.

Below are 2 images, one that looks pretty good, the other has some sync issues. But at least the 'camera' works.


May I see your results?

I actually did everything according to given instructables , but I'm unable to get the image . I'm getting Looking for image in the command prompt . What I must do now!!???

how to connect arduino mega2560 with ov7670 non fifo module? bro

Hello people

I'm working as an ov7670 on a project. The camera has an automatic calibration adjustment function. In the same way as our eyes, where the iris fits when we are in dark surroundings and suddenly we are subject to an external clarity. I read that the camera has a similar function. However, in my project, I need to disable this function.

Could someone help me with this?

Thanks in advance.


Thank you for the instructions.

I hava a problem of: (Error: Could not find or load main class code.SimpleRead

Caused by: java.lang.ClassNotFoundException: com.epam.SimpleRead)

How can I fix this issue??