Arducam OV3640 3MP M12 Mount Camera Module w/ JPEG Output

The module uses a standard parallel interface with 2.54mm pin headers, making it compatible with various platforms. It can be directly interfaced with microcontrollers like STM32 or ESP32 using a parallel GPIO interface. For easier use with single-board computers like Raspberry Pi, you typically need a dedicated host adapter board (like Arducam's shield) that converts the parallel signal to a compatible serial or CSI interface. Always check the voltage level compatibility of your host board with the module's 3.3V logic.

To change the lens, first ensure the module is powered off. The lens is threaded onto the M12x0.5 mount. Grip the lens barrel firmly and rotate it counter-clockwise to unscrew it. To attach a new lens, align the threads and rotate it clockwise until it is snug but do not overtighten. Most M12 lenses have a focus adjustment ring. After attaching, you may need to adjust the focus by rotating this ring while viewing a test image at your desired working distance to achieve a sharp picture.

The onboard JPEG compression processes the raw image data from the sensor into a compressed JPEG format before sending it out via the parallel interface. This significantly reduces the amount of data your main microcontroller or processor needs to handle. For example, a raw 3MP RGB image could be several megabytes, while a compressed JPEG might only be a few hundred kilobytes. This saves SRAM, flash storage, and processing power on your host system and enables faster image transmission over networks like Wi-Fi or cellular for IoT applications.

The module requires a single 3.3V DC power supply connected to its input pins. It contains onboard Low-Dropout (LDO) voltage regulators that generate the necessary 2.8V and 1.8V supplies for the sensor core and analog circuits internally. Ensure your power source can provide sufficient current, especially at higher frame rates. It is critical to use a clean, stable 3.3V rail, as noise can introduce artifacts into the image. Bypass capacitors placed close to the module's power pins on your custom PCB are recommended for optimal performance.