OV7725 phone camera module
OV7725 phone camera module introduction
The phone camera module is used to expand the camera function of the development board. The development board has a special camera module interface, which can expand our camera. After programming the corresponding program, the LCD screen will display the data captured by the camera in real time for real-time monitoring.
The OV7725 cell phone camera module uses the OV7725 CMOS type digital image sensor. It is divided into a cell phone camera module version with FIFO and a cell phone camera module version without FIFO. (FIFO means that products stored first are to be retrieved first.)
OV7725 mobile phone camera module feature
Note: Since the STM32 F1 series microcontroller is not fast enough to process information, it cannot process the 300,000-pixel (ie 640*480 resolution) data from the OV7725 mobile phone camera module in time. A FIFO must be added as a buffer. The FIFO chip can only store one frame of 320*240 pixel data.
OV7725 cell phone camera module datasheet of hardware
Phone camera module size
Cell phone camera module interface
The cell phone camera module interface is a 2*10P DIP interface connected to the camera pins of the development board. The cell phone camera module interface led by the smartphone camera module includes mixed pins of the OV7725 sensor and FIFO, and the external controller can use these pins to drive the camera.
OV7725 Phone camera module pinout definition
|Pin no.||Pin Description||Pin name|
|3||OE||FIFO output enable|
|5||RRST||FIFI read reset|
|7||RCLK||FIFO read clock|
|9||NC||No need to connect|
|13||WRST||FIFO write reset|
|15||WEN||FIFO write enable|
|17||HR||No need to connect|
OV7725 Camera Pin List
|Pin Name||Pin Relationship||Pin Description|
|OE||OE pin of FIFO||Data output enable, active low|
|RRST||RRST pin of FIFO||Read pointer reset signal, active low|
|RCLK||RCK pin of FIFO||Data output synchronous clock|
|VSYNC||VSYNC pin of OV7725||field sync signal|
|WRST||WRST pin of FIFO||Write pointer reset signal, active low|
|WEN||Combined with the following HREF to form the input of the NAND gate||Control the WE pin of FIFO together with HREF, when WEN and HREF are at high level at the same time, WE is at low level, and 0V7725 can write data to FIFO|
|HREF||HREF pin of 0V7725||line sync signal|
|DO[0:7]||DO[0:7] pin of FIFO||data output pin|
|SIO_C||SCL pin of OV7725||Clock line of SCCB bus|
|SIO_D||SDA pin of 0V7725||Data line of SCCB bus|
Cell phone camera module pinout
The cell phone camera module pinout is used to transmit the picture taken by the lens to the video processor through a cable, and it is used as a data transmission connection line for storage. The main function of the cell phone camera module pinout is to transmit the data captured by the camera to the main board, and display the picture through the display screen controlled by the main board.
OV7725 mobile phone camera moduleschematic
Application of mobile phone camera module
The lens part on the smartphone camera module includes a lens mount and a convex lens that can be rotated to adjust the distance. The focal length can be adjusted by rotation. In normal use, the lens mount covers the circuit board to block light, and the light can only be transmitted through the lens to the image sensor in the center., it collects light signals, and the collected data is buffered into the FIFO buffer on the back of the camera, and then the external device obtains the captured image data through the signal pin below. This smartphone camera module is generally used in surveillance cameras, security, expeditions, and license plate detection.
The core chip used by the OV7725 camera module is a CMOS type digital image sensor. CMOS image sensor is a chip that converts photons into electrons for digital processing, and converts image signals into digital signals. It has better signal conversion capabilities and can directly convert charges into voltages in pixels, surpassing traditional ones in terms of performance. CCD sensor, currently, mainstream cameras use CMOS sensor for signal conversion, and CMOS sensor is also widely used in smart phones, digital cameras, automatic driving, security, IOT and other fields.
The camera module is mainly used to create images in digital cameras, digital closed-circuit television cameras, and digital video cameras, and is a key component of digital cameras.
Use phone camera module
When using this phone camera module, we generally support the LCD screen of the development board, configure OV7725 as 240*320 resolution (QVGA), RGB565 format, then the image size of one frame output by OV7725 is 240*320*2=153600 bytes , and the FIFO model AL422B used in this phone camera module has a capacity of 393216 bytes, and can cache up to 2 frames of such images. In this way, STM32 development board does not need to directly process the high-speed output data of OV7725. However, if OV7725 is configured with a resolution of 480*640, the size of one frame of image is 480*640*2=614400 bytes, and the capacity of FIFO is not enough to store such an image directly. Therefore, when OV7725 writes data to FIFO At the same time, the STM32 side must read the data at the same time to ensure that the STM32 side has read this part of the data before the OV7725 overwrites the old data.
Upgrade phone camera module
The steps to upgrade phone camera module are as follows:
1. Prepare IPC configurator, computer, program, router, network cable and other tools;
2. Open the IPC configurator, enter the IPC debugging system, and choose to change the display device type;
3. Select all in the type part, click to display the camera information connected to the LAN, select the device and check it;
4. Enter the folder where the program is stored, select the upgrade program file and run the program to upgrade the camera module.
OV7725 mobile phone camera module shipping List
Mobile phone camera module models
Our company has several camera modules, which are mainly distinguished by the pixels of the camera, which is one of the important indicators to measure the camera. In practical applications, the higher the pixel of the camera, the better the quality of the captured image. The stronger it is, but the amount of data it records will be much larger, so the requirements for storage devices are much higher, so when choosing, just choose the camera that suits you.
|Model||OV2640、200W Pixel Camera Module||OV5640、500W Pixel Camera Module|
|Sensor||OV2640、200W pixel, color, 1600*1200 resolution||OV5640、500W Pixel, color, 2592*1944 resolution, AF auto focus|
|Crystal oscillator||Onboard 24M active crystal oscillator||Onboard 24M active crystal oscillator|
|Interface||2*10P DIP interface or FPC long cable||2*1OP DIP DIP interface or FPC long cable|
|Lens||3.6mm M12 Lens, aperture F2.0, viewing angle 95°, with infrared filter||Focal length 2.7mm, aperture F2.8, field of view 66°, depth of field 2OCM-0.6M (ATO.6M)|
|Mirror mount||Outer frame 21*21*10mm, inner frame 17.7*17.7*6mm||No|
|Program||Provide F429 driver, DCMI interface driver||Provide F429 driver, DCMI interface driver|
|Data Format||8bit, RGB565, can output jpeg directly||8bit, RGB565, can output jpeg directly|
|Frame rate||800*480 resolution, RGB565 format, LCD display 14 frames||No|
|Frame rate||800*480 resolution, RGB565 format, LCD display 14 frames||No|
Cell phone camera module suppliers
The mobile phone camera module market is large due to its wide range of uses, and it is gradually rising. There may be many mobile phone camera module makers in the market, but we suggest you choose a professional phone camera module manufacturer.
We are mobile phone camera module manufacturers and have different type of cell phone camera module for sale, if you want to know phone camera module cost, cell phone camera module replacement, upgrade phone camera module, or you want to know more about other mobile phone camera module, for example, video door phone camera module,phone camera module to USB, convert phone camera module to USB etc., also can contact with us for more consulation.