CMOS OV7670 Camera Module Pin Details:
The OV7670 camera module is a CMOS image sensor that provides full-frame windowed 8-bit images in a wide range of image formats. The OV7670 sensor is controlled using Serial Camera Control Bus (SCCB) which is an I2C interface with a maximum clock frequency of 400Khz.
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Features and specifications of CMOS OV7670 Camera Module:
1. Operating voltage: 3.3V DC
2. Resolution: 640×480 VGA
3. Optical Size: ⅙ inch
4. Power Consumption: 60mW
5. High-quality F1.8 / 6mm lens
6. Output support for Raw RGB (GRB 4:2:2, RGB565/555/444), YUV (4:2:2) and YCbCr (4:2:2) formats
7. S/N Ratio: 46 dB
8. Maximum Image Transfer rate: 30 FPS for VGA
9. Supports image sizes: VGA, CIF, and any size scaling down from CIF to 40×30
10. Standard SCCB interface compatible with I2C interface
11. Lens shading correction Flicker (50/60 Hz) auto-detection
12. Saturation level auto adjust (UV adjust)
13. Edge enhancement level auto adjust
Software Required: to Analyze Output Image from CMOS OV7670 Arduino IDE and Serial Port Reader
Equivalents for CMOS OV7670 Camera Module:
OV7675, OV2640, OV7725, OV5642, OV5647
Pin Configuration of CMOS OV7670 Camera Module:
Pin Number Pin Type Description
1. VCC +3.3V DC power input
2. GND Ground
3. SCL I2C Serial Clock
4. SDA I2C Serial Data I/O
5. VSYNK Vertical Sync output; Active High; Indicates active frames
6. HREF Horizontal Reference; Active High; Indicates active pixels
7. PCLK Pixel clock output from the sensor
8. XCLK Master clock into the sensor
9. Dout9 Pixel Data Outuput 9 (MSB)
10. Dout8 Pixel Data Output 8
11. Dout7 Pixel Data Output 7
12. Dout6 Pixel Data Output 6
13. Dout5 Pixel Data Output 5
14 Dout4 Pixel Data Output 4
15. Dout3 Pixel Data Output 3
16. Dout2 Pixel Data Outuput 2(LSB)
Since the CMOS OV7670 camera module is created by different manufacturers and distributors, the pin configuration might differ. Some OV7670 modules also have 18 pins, 2 of the additional pins may be RESET and PWDN.
Connecting CMOS OV7670 Camera Module with an MCU/MPU:
This section discusses the connections between a microcontroller or a microprocessor to a CMOS OV7670 camera module. It is easy to interface it to an MCU/MPU, but for some, the wiring could get a little complex. Make sure to use good quality and short-length jumper wires as improper wirings could induce noises and impact the picture quality.
IMPORTANT:
Some OV7670 modules also have 18 pins, 2 of the additional pins may be RESET and PWDN. These pins can be connected to the 3.3V and ground pin of the MCU/MPU, respectively.
Functional Block Diagram:
The OV7670 module includes an image sensor array, timing generators, A/D Converters, Test pattern generators, DSP (Digital Signal Processor), Image scaler Digital Video port, Strobe flash control output, and LEDs.
The block diagram above shows how a camera-based system functions. The module is powered by a 3.3V supply. The module is connected to an external oscillator which provides the clock source for the camera module’s XCLK pin. With the proper configuration to the camera’s internal registers via the I2C bus, the camera module provides the pixel clock and the data output back to the host via HREF and VSYNC ports.
Applications for CMOS OV7670 Camera Module
1. Cellular phone.
2. Facial Recognition.
3. Document scanning.
4. Surveillance systems.
5. Obstacle avoidance.
