我不用正反转,用一个脉冲累加器和一个输入捕获,不用外部计数器可以吗?单相的这样接就可以了吧[img=0,1]file:///C:\Documents and Settings\Administrator\Application Data\Tencent\Users\593182136\QQ\WinTemp\RichOle\656]OOHD[N]NAQMD@Q~$6LN.png[/img][img=0,1]file:///C:\Documents and Settings\Administrator\Application Data\Tencent\Users\593182136\QQ\WinTemp\RichOle\656]OOHD[N]NAQMD@Q~$6LN.png[/img][img=0,1]file:///C:\Documents and Settings\Administrator\Application Data\Tencent\Users\593182136\QQ\WinTemp\RichOle\656]OOHD[N]NAQMD@Q~$6LN.png[/img]。[attach]75171[/attach][attach]75172[/attach]
[img]file:///C:\Documents and Settings\Administrator\Application Data\Tencent\Users\593182136\QQ\WinTemp\RichOle\656]OOHD[N]NAQMD@Q~$6LN.png[/img]