stm32f407-4.3 inch "full screen" development board

2 years ago, the author has always wanted to make a 4.3-inch "full screen" development board. Due to various reasons, it has been delayed until today. I am happy to open source and share it! Due to the 'full screen' design, devices can only be arranged on one side. In order to reduce the cost of board printing, a 2-layer board design is adopted. In order to place more development modules in a limited area, a highly dense layout is adopted, so in PCB design Processing such as decoupling capacitors and antenna impedance matching is omitted, and it is enough to meet the development function and program verification. The battery can last for about 50 minutes when fully charged. It supports dual-screen display: 4.3-inch main screen (mcu interface supports i2c capacitive touch screen) + 1.3-inch secondary screen (spi interface can expand i2c touch screen), and supports OV5640 camera, etc.

Functions: STM32F407ZGT6 main control, external expansion 1MB-SRAM, SD card, external Flash, 4G, LoRa, GNSS, audio MP3, DCMI camera, WIFI Bluetooth, 4.3-inch capacitive screen, 1.3-inch SPI screen, six-axis sensing, temperature and humidity Sensing, RS485, CAN, lithium battery charging, dual Type-C interfaces (supports external Flash+SD card to simulate U disk at the same time), flashlight, power monitoring, external power supply monitoring, SW debugging interface, RS485+CAN+ serial port debugging interface, etc.! Note: The actual product is the first test version, and the open source project is the second version after fixing the problems found in the first version.