1. Stm32f030 is used to collect temperature and humidity, and send the data to the host computer through TTL or USB serial port;
2. The current popular USB type-C interface is used for both power supply and serial communication;
3. Ch340g is used as USB to serial chip. After more than ten years of development, Nanjing qinheng's USB to serial chip is quite mature, with good stability and cost performance;
4. The temperature and humidity chip adopts sht20, the typical value of humidity is ± 3% RH, and the typical value of temperature is ± 0.3 ° C. some domestic materials with lower cost and higher cost performance ratio may be considered in the future, provided that the accuracy and consistent performance meet the requirements;