It can be considered as a digital signal, and it is required to meet the requirements of I/O port of single chip microcomputer (level and frequency). If it meets the requirements, it does not need to be processed. The general level may not meet the requirements, so it needs to be converted and simply divided by resistance. Pressure limitation of stabilizer tube; Or after Schmidt shaping (including direction signal), it is sent to the pin of single chip microcomputer.