Welcome to my third development log. In the two previous logs, I discussed the pitfalls I met in the RoboMaster competition and FPGA course final project.This time I will be talking about my graduate design project, an air quality sensor network built by a 3-person group. The whole project is structured as follow:Obtain data from installed sensor modules and upload them to InfluxDB running on a serverSensors we used:MiCS6814, measures NO2, CO, and NH3Analog outputBME680, measures temperature, humidity, atmospheric pressure, and TVOCI2C interfacePMS5003, measures particle mattersUART serial outputExtra modules:ATGM336H, global positioning module with GPS+BeiDou supportUART serial outputESP8266, a widely used Wi-Fi moduleUART serial outputMH-CD42,...

Our school organized a RoboMaster team and planned to attend the competition this year. Since we are all new students at a new campus, we do not have any reference materials available from previous students, and we have to figure out bugs after bugs on our own.This post describes some of the problems we met during software development.Hardware: RoboMaster Official Development BoardMCU Model: STM32F427IIHxSoftware: ChibiOS 18.2.0Board Has 12 MHz HSE Clock Instead of Commonly Seen 8MHzThe pitfall is that neither the manual nor the hardware schematics mentioned the clock frequency.Due to this problem, the actual frequency we programmatically set with STM32CubeMX or other software is much higher than expected. This caused the following problems:...