CMOS OV7670 Camera Module : Working & Its Applications

• The OV7670 OV CMOS image sensor provides full-frame windowed 8-bit images in a wide range of image formats.
• The sensor is controlled using a Serial Camera Control Bus (SCCB) which is an I2C interface with a maximum clock frequency of 400Khz.

Features of CMOS OV7670 Camera Module

• The operating voltage of this sensor is 3.3V DC.
• The resolution of camera is 640×480 VGA.
• Optical Size could be considered as ⅙ inch.
• Power Consumption is nearly 60mW.
• High-quality F1.8 / 6mm lens is used.
• Output support for Raw RGB (GRB 4:2:2, RGB565/555/444), YUV (4:2:2) and YCbCr (4:2:2) formats.
• S/N Ratio is the signal to noise ratio of the sensor at 46 dB.
• The maximum Image Transfer rate is 30 FPS for VGAM.
• Supports image sizes: VGA, CIF, and any size scaling down from CIF to 40×30.
• Standard SCCB interface compatible with I2C interface.
• Lens shading correction Flicker (50/60 Hz) auto-detection.
• Saturation level auto adjust (UV adjust).
• Edge enhancement level auto adjust.

Pin Diagram

1. VCC +3.3V DC power input
2. GND Ground
3. SCL I2C Serial Clock
4. SDA I2C Serial Data Access 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 Output 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 Output 2(LSB)
17. Some OV7670 modules also have 18 pins, additional pins RESET & PWDN, connected to:-
18. RESET 3.3V and
19. PWDN ground pin of the MCU/MPU, respectively

Interface:

• The typical connection between sensor and microcontroller unit is

• The host needs an additional buffer for interfacing

Applications of CMOS OV7670 Camera Module

• Cellular Phone
• Facial Recognition
• Document Scanning