The Wiegand sensor which is a kind of zero power sensor is choosed as theimpulse sensor.
脉冲传感器选择韦根传感器,是一种零功耗磁敏传感器。
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Wiegand: the part I like to focus on is not just seeing what's happening today, so seeing the code as it's developed and being able to run it, which is very important.