Description
VGA camera model OV7670 with a maximum resolution of 640x480 pixels (0.3 Megapixels), low supply voltage, single-chip CMOS image sensor has a wide range of frame formats and is controlled by the Serial Camera Control Bus (SCCB), which is analogous to the I2C bus, IIC.
VGA OV7670 camera, SCCB, Current consumption in sleep mode, IIC, the Arduino module is used to capture, primary processing and image transfer to the controller, display, other image processing device, etc..
To use the camera, you need to assemble a layout based on it - connect the power, connect to Arduino controller (other microprocessor control device), display, another image processing device, etc.. Thereafter, remove the protective cap from the lens and start working. The lens is screwed on the thread and it is possible to change the distance from the lens to the single-chip CMOS sensor by turning the thread.
VGA OV7670 camera, SCCB, Current consumption in sleep mode, IIC, arduino module can be controlled by arduino controller, other microprocessor control device, as well as from a computer using special programs for managing serial ports (Serial port). The camera is controlled via the Serial Camera Control Bus (SCCB) interface, which is analogous to the I2C bus, IIC.
OV7670 camera generates images with maximum resolution 640 NS 480 and can deliver it at speeds up to 30 frames per second. The video interface uses frame-by-frame VSYNC, by HREF lines and by PCLK pixels. Pixel data, representing encoded information about its color, issued via 8-bit parallel interface D7 - D0 on PCLK clocks.
Need to keep in mind, that one pixel is not equal to one byte. In the case of RGB encoding, pixel color data is given in two bytes.. YCbCr encoding is also possible. There are many settings for OV7670. For example, You can use the following frame formats:
- VGA (640 x 480Stepper motor driver (suitable UNL
- QVGA (320 х 240Stepper motor driver (suitable UNL
- CIF (352х 240Stepper motor driver (suitable UNL
- QCIF (176 × 144Stepper motor driver (suitable UNL
- manual scaling.
RGB available in the following options: RGB565, RGB555 and RGB444. The numbers represent, number of bits per color. For example, RGB565 — 5 bit on red, 6 bit on green and 5 bit on blue. In addition to the above, there are many more settings (gain adjustments by colors, gray levels, signal polarity, internal PLL, etc.)
VGA OV7670 camera, SCCB, Current consumption in sleep mode, IIC, the Arduino module has one 18 pin interface for connecting input, output signals and power:
- VDD - power;
- GND - common;
- SDIOC - (input) clock signal of the camera control serial interface SCCB;
- SDIOD - (input / output) information signal (data) of the serial interface SCCB for controlling the camera;
- VSYNC - (output) frame synchronization pulse;
- HREF - (output) horizontal sync pulse;
- PCLK - (output) clock pulse for issuing a byte from the parallel port D7 - D0;
- XCLK - (input) the main clock pulse for the operation of the OV7670;
- D7 - D0 - 8-bit parallel video output;
- RESET (Reset) - output of a hardware reset of the camera;
- PWDN - hardware enable / disable camera output.
The module can be powered either from the Arduino controller, other microprocessor control device, external power supply (power supply, batteries). Module supply voltage 3 – 5 IN.
Characteristics:
- model OV7670;
- single-chip CMOS image sensor;
- controlled via the Serial Camera Control Bus (SCCB), which
- is analogous to the I2C bus, IIC;
- maximum resolution 640x480 pixels (0.3 megapixels);
- available resolutions: QVGA (320 x 240); CIF (352х 240); QCIF (176 × 144Stepper motor driver (suitable UNL
- manual scaling;
- encoding options: RGB565, RGB555, RGB444, YUV/YCbCr 4:2:2, GRB 4:2:2,
- Raw RGB Data;
- voltage at CMOS image sensor: 1,8 AT;
- voltage on analog elements: 2,45 – 3 AT;
- module supply voltage: 3 – 5 AT;
- current consumption: 20 mA;
- lens size: 1/6 inches;
- viewing angle: 24 degrees;
- image output speed: up to 30 frames per second;
- sensitivity: 1,1 V/lux-sec;
- signal-to-noise ratio: 46dB;
- dimensions: 35 NS 35 NS 31 mm;
- the weight: 12 r.
