When the signal is input to the main control board of the MCU for processing, external interference will also enter through the input port. In addition to the use of anti-jamming device optocouplers on the input interface, anti-interference measures must be taken on the software to ensure reliable operation. Otherwise, it will cause a malfunction and make it not work properly. From the input port, the interference is a random spike with varying amplitude and width. The main task of anti-jamming design is to identify the authenticity information, discard the interference, and leave a useful signal. We have taken the following measures and received good results.
The pulse width discrimination input pulse has a certain width, and the interference is mostly a sharp pulse, and continuous sampling is needed to distinguish the true signal from the interference signal. First, collect the signal and look for the rising edge of the signal. When the rising edge is found, it is sampled K times multiple times (four times in the figure), and if there is still a signal after K times, it is considered to be a true signal. If the signal is not collected after 2 to K times, it is considered that the interference signal is just collected. With this method, the intrusion of the interference signal can be greatly suppressed.
(Finish)
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