171CCS76000 模塊采用數字智能熱釋電紅外傳感器,該傳感器是將數字智能控制電路與人體探測元都集成在電磁屏蔽罩內的熱釋電紅外傳感器。人體探測元將感應到的人體移動信號通過甚高阻抗差分輸入電路耦合到數字智能集成電路芯片上,數字智能集成電路將信號轉化成15位ADC數字信號,當PIR信號超過選定的數字閥值時就會有延時的REL電平輸出。所有的信號處理都在芯片上完成。
二:傳感器輸出觸發模式
當探頭接收到的熱釋電紅外信號超過探頭內部的觸發閾值之后,內部會產生一個計數脈沖。當探頭再次接收到這樣的信號,它會認為是接收到了第二個脈沖,一旦在4秒鐘之內接收到2個脈沖以后,探頭就會產生報警信號,同時REL引腳有高電平觸發。另外,只要接收到的信號幅值超過觸發閾值的5倍以上,那么,只需要一個脈沖就能觸發REL的輸出。下圖為觸發邏輯圖示例。對于多次觸發情況,輸出REL的維持時間從最后一次有效脈沖開始計時。
三:傳感器控制原理
人體感應模塊的紅外傳感器上加裝了個菲尼爾透鏡,它可以把周圍120°內的光線匯聚到傳感器上,使得模塊感應變的更加靈敏,當有人在傳感器前經過時,人體發射出來的紅外線會通過菲尼爾透鏡傳輸到紅外傳感器上面,這是,模塊的REL管腳就會輸出高電平,同時模塊上的LED燈亮,持續2.6秒之后,REL 管腳變成低電平,LED等滅。所以我們可以通過MCU檢測REL管腳的電平變化,從而檢測到是否有人在模塊的感應區域內。
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