Disclosed is a head-down and usage posture detection system using a direction sensor of a handheld device, in which a posture detection system is implemented by programming. The posture detection system is installed in prevalent handheld devices like smart phones and tablets in order to make use of the powerful computing capability and the advantage of being compact and small and easy to carry of the handheld device to realize the posture detection system. When put into operation, the posture detection system accesses information from a direction sensor built in the handheld device in order to perform detection of head-down or usage posture. When head-down or usage posture is beyond an angle and time predetermined by the user, the handheld device displays related warnings on a screen or reminds the user, via vibration, sound and/or voice of the handheld device, to adjust the posture or to take a break for body stretch before the operation is continued.一種運用手持裝置之方向感測器的低頭與使用姿態偵測系統,其係以程式編寫的方式,構成姿態偵測系統,該姿態偵測系統並安裝在已日漸盛行的智慧型手機或平板電腦等手持裝置上,以利用手持裝置強大的處理運算效能與輕薄便於攜帶的優勢,讓該姿態偵測系統能獲得實現,又本姿態偵測系統在使用時係會抓取手持裝置內建之方向感測器資訊,俾進行低頭或使用姿態偵測,當低頭或使用姿態超過使用者所設定角度與時間,手持裝置之螢幕便會顯示相關警示,或利用手持裝置之震動、聲響語音提醒使用者調整其姿勢,或片刻休息伸展其身體後再進行操作。(10)‧‧‧姿態偵測系統(20)‧‧‧手持裝置
