Seedling Maintenance Management Program

Since in January, February and December, Dalian was at the lowest temperature and the nursery stocks in open fields were dormant, the maintenance and management of seedlings basically did not take measures.
In March: Temperatures began to rise. After mid-day, seedlings began to

ARM core board - level conversion circuit (on)

In the circuit design process, electronic engineers often encounter the problem that the I/O level of the processor MCU and the I/O level of the module are not the same. In order to ensure the normal communication between the two, level conversion is required. Below, we will make a detailed ana