adafruit_ov7670

CircuitPython driver for OV7670 cameras

  • Author(s): Jeff Epler

Implementation Notes

Hardware:

Software and Dependencies:

class adafruit_ov7670.OV7670(i2c_bus, data_pins, clock, vsync, href, shutdown=None, reset=None, mclk=None, mclk_frequency=16000000, i2c_address=33)

Library for the OV7670 digital camera

Parameters

  • i2c_bus (busio.I2C) – The I2C bus used to configure the OV7670

  • data_pins (List[microcontroller.Pin]) – A list of 8 data pins, in order.

  • clock (microcontroller.Pin) – The pixel clock from the OV7670.

  • vsync (microcontroller.Pin) – The vsync signal from the OV7670.

  • href (microcontroller.Pin) – The href signal from the OV7670, sometimes inaccurately called hsync.

  • shutdown (Optional[microcontroller.Pin]) – If not None, the shutdown signal to the camera, also called the powerdown or enable pin.

  • reset (Optional[microcontroller.Pin]) – If not None, the reset signal to the camera.

  • mclk (Optional[microcontroller.Pin]) – The pin on which to create a master clock signal, or None if the master clock signal is already being generated.

  • mclk_frequency (int) – The frequency of the master clock to generate, ignored if mclk is None, requred if it is specified

  • i2c_address (int) – The I2C address of the camera.

capture(buf)

Capture an image into the buffer.

Parameters

buf (Union[bytearray, memoryview]) – A WritableBuffer to contain the captured image. Note that this can be a ulab array or a displayio Bitmap.

property colorspace

Get or set the colorspace, one of the OV7670_COLOR_ constants.

deinit()

Deinitialize the camera

property flip_x

Get or set the X-flip flag

property flip_y

Get or set the Y-flip flag

property height

Get the image height in pixels. A buffer of 2*width*height bytes stores a whole image.

property mclk_frequency

Get the actual frequency the generated mclk, or None

property night

Get or set the night-vision mode, one of the OV7670_NIGHT_MODE_ constants.

property product_id

Get the product id (PID) register. The expected value is 0x76.

property product_version

Get the version (VER) register. The expected value is 0x73.

property size

Get or set the captured image size, one of the OV7670_SIZE_ constants.

property test_pattern

Get or set the test pattern, one of the OV7670_TES_PATTERN_ constants.

property width

Get the image width in pixels. A buffer of 2*width*height bytes stores a whole image.

adafruit_ov7670.OV7670_ADDR = 33

Default I2C address if unspecified

adafruit_ov7670.OV7670_COLOR_RGB = 0

RGB565 big-endian

adafruit_ov7670.OV7670_COLOR_YUV = 1

YUV/YCbCr 422 big-endian

adafruit_ov7670.OV7670_NIGHT_MODE_2 = 160

Night mode 1/2 frame rate

adafruit_ov7670.OV7670_NIGHT_MODE_4 = 192

Night mode 1/4 frame rate

adafruit_ov7670.OV7670_NIGHT_MODE_8 = 224

Night mode 1/8 frame rate

adafruit_ov7670.OV7670_NIGHT_MODE_OFF = 0

Disable night mode

adafruit_ov7670.OV7670_SIZE_DIV1 = 0

640 x 480

adafruit_ov7670.OV7670_SIZE_DIV16 = 4

40 x 30

adafruit_ov7670.OV7670_SIZE_DIV2 = 1

320 x 240

adafruit_ov7670.OV7670_SIZE_DIV4 = 2

160 x 120

adafruit_ov7670.OV7670_SIZE_DIV8 = 3

80 x 60

adafruit_ov7670.OV7670_TEST_PATTERN_COLOR_BAR = 2

8 color bars

adafruit_ov7670.OV7670_TEST_PATTERN_COLOR_BAR_FADE = 3

Color bars w/fade to white

adafruit_ov7670.OV7670_TEST_PATTERN_NONE = 0

Normal operation mode (no test pattern)

adafruit_ov7670.OV7670_TEST_PATTERN_SHIFTING_1 = 1

“Shifting 1” pattern