Open source microPython development board design

Recently I found that the microPython development board is really good. It has more functions than Arduino and is very flexible to use. There are very few microPython development boards on Taobao, and the price is also very high, all of which are more than 200. Therefore, considering the price and the small number of components on the board, if netizens complete it by DIY, they can save at least 70% of the cost. Therefore, all its information is open source. Python 3 syntax: complete Python lexical analyzer, parser, compiler, virtual machine and runtime. Contains command line interface and can be run offline. Python bytecode is compiled and run by the built-in virtual machine. Effective internal storage algorithm can bring efficient memory utilization. Integer variables are stored in the memory heap instead of the stack. Using the Python decorators feature, functions can be compiled into native machine code. Although this feature will bring about 2 times the memory consumption, it also makes Python have a faster execution speed.