Stm32f40 1. According to the official inquiry of the electronic design competition for college students, there are many models of stm32 (f40 1). Because the price of stm32f40 1 is cheaper than that of stm32f 103, there are more floating-point processors on the hardware, and the main frequency is also improved, so the pid of the inverted pendulum balance car is processed. The National Electronic Design Competition for College Students is one of the subject competitions for college students jointly sponsored by the Ministry of Education and the Ministry of Industry and Information Technology. The contest is aimed at college students' mass scientific and technological activities and aims to promote the reform of the curriculum system and content of information and electronics in colleges and universities.