許多極重度肢體障礙者由於身體功能所限，被迫將其生活範圍侷限於家中狹小範圍。因此，本研究以能夠服務四肢癱瘓患者的使用為第一考量，設計出一套應用於ZigBee無線數位家電之摩斯碼嵌入式系統 (Embedded System with Morse Code for ZigBee Home Appliances，EMZ)。EMZ是結合嵌入式系統、電腦、輔助電腦裝置與Zigbee無線感測器網路四項，透過摩斯碼輸入許可控制電路，使用者只需一個摩斯碼輸入訊號源，便可自主操作EMZ。使用者觸發EMZ之嵌入式系統或電腦的人機介面發射控制命令，達到ZigBee 802.15.4無線數位家庭電器控制和環境監控的目的。

經由驗證EMZ實作成果，確實能有效的整合嵌入式系統模式切換和與電腦控制端的通訊交握，致使EMZ在不同模式下的控制命令得以正確運行；然而，在無線網路傳輸過程中若無法有效避免封包碰撞情況產生，將影響接收模組接收訊號與提供相對應控制服務的準確性。故本研究再針對過程中無線資料傳輸遺失與重發的延遲時間問題而取消封包要求機制，進而改善因封包碰撞所衍生EMZ運作效能的問題，經實驗結果得知亦可提升EMZ無線傳輸成功率。最後，EMZ實際導入到脊髓損傷四肢癱瘓個案的家中，個案同意EMZ能簡易上手操作且確實能讓其生活獨立，並減輕照護者的負擔。

It’s recognized that people with severe physical disabilities have suffered from the confinement of their lifes. Therefore, we present an embedded system with Morse code for ZigBee home appliances (EMZ), encompassed embedded system, computer, assistive computer input device, and ZigBee wireless sensor network. The EMZ can be operated using single signal source of Morse code. By touching the human machine interface, the quadriplegics can reach not only ZigBee 802.15.4 home appliances but also indoor/outdoor environment monitoring.

According to the empirical results of the mode exchange of embedded system and communication with computer control sides, the EMZ can conduct correctly and effectively under different modes. However, the received signals and the accuracy of offering the corresponding control service will be affected due to the problems of data missing in wireless transmission and delay time in retries. Hence, we cancelled the packet-required mechanism to improve the occurrence of performance degradation in the EMZ operation as packet collision occurs. By this means, the success rate of the EMZ wireless transmission was enhanced. Consequently, we introduced the EMZ successfully into a family which has a quadriplegic member, and user agreed it achieved use-friendly and could help user be more independent in his/her daily life, as well as eased the burdens of caregivers.

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