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TODO:
(lld采用压力传感器检测液面)
移液枪液面探测方法修改成
lld_prepare时，记录一个压力值
lld启动时，先不移动步进电机，先读取压力值，如果压力值大于记录值，说明有液体
否则，移动步进电机，直到压力值大于记录值
1. 将液面探测做到最佳
