OV7670 VGA Camera Module

 

Key Features

• Image Sensor: CMOS sensor with VGA resolution (640 x 480 pixels)
• Output Formats:
  • YUV (4:2:2), RGB565/555, and RAW Bayer data formats
• Communication Interface: SCCB (Serial Camera Control Bus, similar to I2C)
• Frame Rate: Up to 30 fps at VGA resolution
• Lens: Fixed-focus lens
• Power Supply: 3.3V
• Low Power Consumption: Optimized for embedded applications
• Adjustable Parameters: Brightness, contrast, saturation, and more via registers.

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Specifications

• Resolution: VGA (640x480), with support for lower resolutions like CIF (352x288) and QCIF (176x144).
• Pixel Size: 3.6 µm x 3.6 µm
• Maximum Frame Rate:
  • VGA: 30 fps
  • QVGA (320x240): 60 fps
• Operating Voltage:
  • Analog: 2.5V–3.0V
  • Digital: 1.7V–3.0V
• Communication Protocol: SCCB (supports register configuration)
• Clock Input: Typically requires a 24 MHz external clock.

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Pinout

1. GND: Ground
2. VCC: 3.3V Power
3. SCL: SCCB Clock Line
4. SDA: SCCB Data Line
5. RESET: Reset (active low)
6. PWDN: Power down (active high)
7. VSYNC: Vertical sync
8. HREF: Horizontal reference
9. PCLK: Pixel clock
10. D0–D7: Data pins (8-bit parallel output)

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Applications

• Image and video capture for IoT devices
• Embedded vision systems
• Educational projects
• Object detection and tracking
• Motion detection
• Surveillance systems

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Interfacing the OV7670

The module outputs an 8-bit parallel data signal synchronized by VSYNC, HREF, and PCLK. Interfacing it with microcontrollers like Arduino or STM32 involves the following:

1. Hardware Setup:
   • Connect the SCCB pins (SCL, SDA) to the microcontroller's I2C lines.
   • Connect PCLK, VSYNC, HREF, and D0–D7 to GPIO pins.
2. Software Libraries:
   • Use libraries or write custom drivers to configure the camera module and capture data.
   • Configure camera registers to set resolution, output format, and other parameters.
3. Data Processing:
   • Use external memory (e.g., SD cards) for storage, or process the data for tasks like object detection or color filtering.