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Data output from OV7670

Former Member

Hi All.

 

I have been trying to get some useful data from the OV7670 camera module but it seems that it is not outputting the correct data. I have been using this code: https://github.com/ComputerNerd/ov7670-no-ram-arduino-uno and everything seems fine from a software point of view but what I am getting out is not as expected. With the lens covered I should get a stream of repetitive data like [0,80,0,80,0,80....] but I dont regardless of whether it is covered or not. I have tried various register settings and still no joy. Even with default register settings I should be able to see a basic image. I have also viewed the data from the device on a logic analyzer and it is clear that the data is random. The pic below is the camera module output data with the lens covered and it can be seen that the data is totally random.

 

image

 

Anyone know why this is happening or has seen it before?

 

Thanks,

 

Mark.

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  • 0

    9 times out of 10, the connections are not right. Please double check these:

    Connections

    Order Arduino ov7670

    A5->SIOC

    A4<->SIOD

    Note what I have just described (above) are I2C connections you will need pullup resistors to 3.3v for both SIOC and SIOD.

    You must not connect the resistors to 5v.

    I have found that certain resistor values do not work such as 1K and 2.2K but found 4.7K and 10K to work.

    11-> (convert 5v to 3.3v) XCLK

    A0<-0

    A1<-1

    A2<-2

    A3<-3

    4<-4

    5<-5

    6<-6

    7<-7

    3<-VSYNC

    2<-PCLK

    GND->PWDN

    3.3->RESET

    GND->GND

    3.3v->3.3v

    Do you have a way to check all the voltage levels?

    Clem

    PS check the address of I2C is correct also.

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  • 0

    9 times out of 10, the connections are not right. Please double check these:

    Connections

    Order Arduino ov7670

    A5->SIOC

    A4<->SIOD

    Note what I have just described (above) are I2C connections you will need pullup resistors to 3.3v for both SIOC and SIOD.

    You must not connect the resistors to 5v.

    I have found that certain resistor values do not work such as 1K and 2.2K but found 4.7K and 10K to work.

    11-> (convert 5v to 3.3v) XCLK

    A0<-0

    A1<-1

    A2<-2

    A3<-3

    4<-4

    5<-5

    6<-6

    7<-7

    3<-VSYNC

    2<-PCLK

    GND->PWDN

    3.3->RESET

    GND->GND

    3.3v->3.3v

    Do you have a way to check all the voltage levels?

    Clem

    PS check the address of I2C is correct also.

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