Practice and Thinking of Online Courses Based on "Dingtalk + Chaoxing" in COVID-19 Epidemic Situation

Since the outbreak of Novel coronavirus pneumonia (COVID19) at the beginning of this year, colleges and universities have actively responded to the call of "Suspension of classes and non-stop learning" by the Ministry of education, and have adopted online teaching methods to organize teachers and students to teach and learn. Under this background, the method of "DingTalk live broadcast + online interactive Chaoxing network teaching platform" is used for the online courses of "Single-chip microcomputer principle and interface technology" and “Database principle and Application”. Multiple ways combined the interaction are used to mobilize the classroom atmosphere in class, and homework and test are arranged to consolidate the learning points after class. Therefore, using this teaching mode can achieve good teaching and learning effect. Since January 2020, coupled with the shutdown of many enterprises during the Spring Festival, novel coronavirus pneumonia (COVID-19) broke out nationwide, which greatly affected the industry, agriculture and service industry. Not only that, the teaching of students at all levels was affected. In order to stabilize the epidemic, the Ministry of Education issued a notice of “Suspension of classes and non-stop learning" on January 27, calling on schools to conduct online teaching. In some provinces, online classes have started before the end of winter vacation. This is the first large-scale online teaching in our country, so most teachers and students lack teaching and learning experience in online classes. At the beginning of a period of time, various problems have appeared: the network is unstable and often disconnected. The teacher is not familiar with the live broadcast software in class, and some of them forget to turn on the microphone or forget to turn off the live broadcast after class. Students are also tired of listening to the class, because they are still on vacation and sometimes forget the class time, etc. Different courses are taught on different platforms. So students need to download various Apps and find out the operating routines and various clock-in (including attendance, homework, exercises and tests). Staring at the computer or mobile phone for a long time to learn , their eyes are tired, and learning efficiency is very low [1,2] . Under the call of the Ministry of Education, we are asked by the college to start online classes on February 17. This paper mainly introduces the specific implementation, experience and thinking of the online lectures of the course "Single-chip Microcomputer Principle and Interface Technology" and “Database principle and Application” taught by the author.