CamCAD

Component Connections and Layout

Schematics

STM32 Power Requirements Schematic (power_conns.kicad_sch)

This schematic is based off of the power requirements detailed in the STM32 F405xx/F407xx datasheet and cross-checked with the ST Application Note AN4488 for good measure.

Power Supply and Charging Schematic (buck.kicad_sch)

This schematic contains all of the circuitry necessary to make charging possible and exposes pins to the battery. It includes connections for a USB-C socket that serves as the charging port for the camera, connections for the Dynamic Power Path Management IC (charging + power management), the buck converter circuitry to efficiently step down the battery's 3.7V to 3.3V, and the battery terminals, which will use an XH socket. (Initially I planned to have the buck converter on a separate schematic, hence the filename, but there wasn't enough detail to justify a separate schematic)

Components Schematic (components.kicad_sch)

This schematic contains the component connections that provide all the functionality of a camera. It contains the OV7670 Camera Module, the ILI9341 Display header, activity LEDs, and the MicroSD transflash breakout board.

STM32F407 schematic (f407zgt6.kicad_sch)

Contains the STM32F407ZGT6 LPQF144 chip. In the near future I will put more circuits in this schematic, such as the bootloader switch.

User Interface (user_interface.kicad_sch)

This schematic contains the buttons that will aid the user in communicating with the camera, such as taking pictures, toggling flash, deleting pictures, and navigating saved pictures via a picture menu.

PCB Layout (Two Layer)

I was recommended to use four layers to separate the ground and VCC Planes better, but this is what I got routing with a two-layer PCB, with the back CU layer housing a ground fill zone. The following layout was verified by the DRC. All dimensions are in mm.

PCB Layout (Four Layer)

This PCB will be printed once I reverify the schematics and layout. I was able to make the board a little more compact with four layers. The layout was verified by the DRC. All dimensions are in mm.