Introduction:

This is a development board based on STM32F429. It was a development board I made when I was learning STM32 a long time ago. At that time, the chip price was still very cheap (about 30 yuan). At that time, I just learned the STM32F103 series of microcontrollers. I wanted to change my studies to a more advanced one. I didn’t know much about it at the time, so I drew this board by referring to the principles of wildfire. After I built the board and soldered it for testing, there was basically no problem. However, there were some things that delayed me and I didn’t have time to study. I've been putting it aside, so I'll take some time today and open source it.

1. Interface

This development board has many interfaces. I combined the functions of Wildfire to select some commonly used devices, removed some uncommon interfaces, and added some interfaces that I thought might be used, and also introduced most of the pins. Very easy to expand.

PCB preview interface includes:

ST_link interface, serial port, USB interface

Button, LED

DHT11

OLED (IIC interface)

Ultrasonic interface

Bluetooth interface

Servo interface

WS2812

Infrared obstacle avoidance interface

NAND flash

SDRAM

RGB screen

SD card

W25Q flash

AT24EEPROM

Infrared interface head

NRF24L01 wireless module interface

ESP8266 WIFI interface

Overall, there are still many functions.

2. Design

I made this trace in the PCB blindly (leaving tears of unskilled eyes). In order to trace the traces of equal lengths, the frequencies may not need to be of equal length, and the impact will not be big.

Some other details, it took too long to remember.

3. Functional testing

Currently, I have tested W25Q, AT24, NRF24L01, ESP8266, RGB screen, NAND flash, SD card, WS2812, LED, etc. (because I have no time to play, I have been working on linux recently)

Below is the diagram driving the RGB screen

4. Design defects

1.W25Q

At present, I have found one place. In W25Q, I found that the ground below is not connected, which causes W25Q to not work and can be operated by flying wire.

Below is the modified version.

Version 2.0 has been modified in both schematic and PCB.

2.micro usb interface

There are three micro USB interfaces on the board, but these three interfaces are too close and may be crowded when plugged in. You can modify them by yourself.

Other defects have not been discovered yet, and we look forward to everyone correcting them.