廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
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更新時間:2018-03-26 05:54:55瀏覽次數(shù):305
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AS-BDAP-210*-*AS-BDAP-210
AS-BDAP-210*-*AS-BDAP-210
矩陣按鍵
5.1 矩陣按鍵和獨(dú)立按鍵的關(guān)系
我們在使用按鍵的時候有這樣一種使用經(jīng)驗(yàn),當(dāng)需要多個按鍵的時候,如果做成獨(dú)立按鍵會大量占用IO口,因此我們引入了矩陣按鍵,如圖8所示,使用了8個IO口來實(shí)現(xiàn)16個按鍵。
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圖8 矩陣按鍵
其實(shí)獨(dú)立按鍵理解了,矩陣按鍵也簡單,我們來分析一下。圖8中,一共有4組按鍵,我們只看其中一組,如圖9所示。大家認(rèn)真看一下,當(dāng)KeyOut1輸出一個低電平,KeyOut2、KeyOut3、KeyOut4這三個輸出高電平時,是否相當(dāng)于4個獨(dú)立按鍵呢。
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