1.項目背景

糧食是人類賴以生存的基本物質，是關系國計民生的重要物資，糧食始終是經濟發展，社會穩定，國家自立的基礎。

目前我國地方各大糧庫都存在著，不同程度的糧食變質問題，大部分糧庫還采用人工測溫的方式，不僅增大糧庫工作人員的工作量，且效率低，效果差。尤其是大型糧庫的溫度測量不能及時而徹底的完成，導致大面積的壞糧。據統計，我國每年因糧食存儲不當而發霉變質的糧食就達上億斤，造成了無法估量的損失。

糧食的溫濕度是影響糧食儲藏的最重要參數，如何控制好糧庫的溫濕度就變成了，保證糧食質量的唯一的手段。北京惠企物聯科技，立足于物聯網的研發與應用，積極響應國家“大力發展物聯網”的號召，以“全面感知-可靠傳遞-智能處理”為核心理念，在詳細的了解了糧庫應用工藝后，將ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" title="ZIGBEE">ZIGBEE" 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2.糧庫溫控現狀

早期的糧庫溫濕控制，主要是采用干溫度表、毛發濕度計、雙金屬式測量計、濕度測試紙等測試器材人工檢測。它是將溫度計放入到插桿中，根據經驗插在糧堆的多個測溫點，管理人員定期拔出讀數，來確定糧食溫度的高、低，進而決定是否倒糧。這種方法有一定的作用，但是由于溫度計精度、人工讀數錯誤、人工讀數效率低下等原因。導致溫控檢測速度慢、精度低、抽樣不徹底、局部溫度過高不易被發現。進而導致了局部糧食發霉變質，引起大面積壞糧。

3.系統簡介

本系統是采用最先進的ZigBee無線傳輸技術。在糧庫的不同地方分置溫濕度傳感器，溫濕度傳感器是采用無線傳輸，將現場測量到的數據通過無線電磁波，傳送給糧庫內的讀寫器，讀寫器再通過無線中繼器，將數據無線傳輸給電腦，電腦將接受到的數據存儲，并與系統設定的標準值比較。若現場值超出標準值，系統會報警告知管理人員，并會自動的控制風機等設備作降溫處理。

4.系統模塊

4.1硬件組成

4.1.1溫濕度標簽：

該溫濕度標簽是由3部分組成：微型模擬溫濕度傳感器、單片機、無線收發模塊，標簽內帶有全球唯一的ID號。

微型模擬溫濕度傳感器：是采用微型的模擬傳感器，該傳感器將時時的采集糧庫內的溫濕度參數，并將該數據傳送給單片機處理。該傳感器是采用TI公司的智能模塊，即高精，超微，高穩定性于一身。非常適合于較小空間內的測溫傳感。

單片機：采用增強型的8051單片，是工業控制中比較經典的單片機，具有穩定可靠的性能，和強大的功能。該單片機接收到溫濕度信號后，通過A/D智能轉換及放大，將數字信號傳送給無線收發模塊。

無線收發模塊： 將單片機傳送過來的數字信號調制成電磁波。采用TI公司的CC2420芯片，電源供電，2.4~2.5GHZ通訊頻段，最遠可無線傳輸1000米。

該溫濕度標簽的主要功能即為：采集現場的溫濕度數據，通過無線發送到讀寫器，并經由讀寫器將數據上傳給電腦。

溫濕度標簽的分類：

盒式溫濕度標簽：

4.1.2讀寫器：

將接受到的電磁波信號，通過解調。讀寫器內同樣集成單片和收發模塊，讀寫器的收發模塊只接受傳感器標簽的發送信號。讀寫器將解調過的信號，利用串口，網口上傳給電腦。

4.1.3電腦：

采用工業控制機，內置可靠的工業串口或網口，保證了數據傳輸的穩定性；系統采用組態軟件，可實現快速的數據分析能力，及強大的I/O口擴展控制。

4.2軟件組成：

動態記錄功能：連續如實的采集和記錄監測溫度、濕度等參數的情況，以數字和圖形、表格方式進行實時顯示和記錄監測信息；

超限報警功能：在出現異常數據的時候，如溫濕度、濕度超過上下限時，可以按照使用人員指定的方式輸出多種報警。如：聲音報警、電話振鈴報警、發送電子郵件報警、短消息報警，可設置短消息群發，并且系統可在不同的時刻通知不同的值班人員；

數據統計分析功能：實時顯示或者歷史顯示房間的各參數曲線變化，可以同時顯示多個不同房間的環境參數曲線，更方便比較分析。可顯示參數列表、實時曲線圖（對應具體數值并任意調整坐標）、實時數據、折算數據、累計數據、歷史、報警畫面、報表等多種顯示、統計功能更加貼近用戶需求；

5.流程介紹

當在糧庫中，安放好標簽后，標簽會時時采集糧庫中的溫濕度信息；并自動的將數據發送給讀寫器；讀寫器并將數據通過串口或網口，傳輸給電腦；電腦將接受到的數據存儲并比較，系統會掉出設置的標準值，與采集到的現場數據做比較；當現場的溫濕度高于標準值時，電腦則通過其I/O控制口，控制現場的風機啟動降溫；在此同時電腦會時時通過傳感器的信號，監控糧倉內的溫濕度，知道達到設定值。

舉例：

每只溫濕度傳感器都帶有一個ID號，而此ID號是有24位的字母、數字組成，可以實現無限的序號組合，即可實現全球唯一ID號；

每只標簽的ID號與其所在的位置是相對應的，這個可以在系統建數據庫時，位置綁定在該ID號的信息中。即當系統讀取到序號為“1234567”的ID號時，系統即會知道該標簽是處于：第6號倉的，第3只溫濕度標簽，具體位置是：高6.5米;距離A面墻3.2米；距離B面墻6.2米；如該標簽測量的溫度較高時，系統就會知道具體的位置，方便調整。

當標簽測量到現場的數據后，即會利用自身內置電源，激活單片機中的無線收發模塊，將數據無線發出，傳輸距離可最長達1000米；標簽的發送距離可以根據現場的具體距離調制，可做到10~1000米間調整。  同時標簽利用電磁波傳送，具有較強的穿透力，即便將標簽植入糧食內，同樣可以準確讀取。

標簽將數據傳送到讀寫器，讀寫器通過解調過來的數據，并通過串口485總線傳送給電腦。讀寫器掛式的安裝到糧倉外部，在通過線纜傳送給電腦數據。這樣可以為空間有限的糧倉節省空間，同時避免倉內繁瑣布線的問題。

電腦接收讀寫器過來的數字數據，并與系統內設置的標準值作比較。如下顯示：

當系統檢測到溫度，或濕度超出標準值時，一方面報警告知管理人員，由倉管員處理；另一方面會自動控制倉內的降溫設備開啟：像開啟風機排濕，排熱；或通過調整其他的設備。系統同時會時時檢測標簽傳過來的溫濕度值，當溫濕度降到標準值時，系統即控制降溫設備關閉。