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11/18~11/22 員工旅遊,暫停出貨及回覆訂單,11/23 恢復作業,請自行評估下單及收貨時間。
最後出貨日|郵局 11/16|7-11、黑貓宅配 11/17 中午 12:00 前
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HC-SR04 ultrasonic ranging module triggered by an IO pulse, with distance derived from the Echo pulse width
3-5.5V | 2-450cm at 5V and 2-400cm at 3.3V | under 15 degrees | 40kHz | -20 to 80C | 4.5x2cm
Pins: VCC, Trig, Echo, GND; compatible with the HC-SR04-P
滿千免運優惠(限郵寄和超商純取貨) on order
本賣場無實體店面,無提供自取服務,敬請見諒。 on order
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模組工作原理:

採用IO觸發測距,給至少10us的高電壓信號,實際40-50uS效果好。
模組自動發送8個40khz的方波。
有信號返回,通過IO輸出─高電壓,高電壓持續的時間就是超聲波從發射到返 回的時間。
測試距離=( 高電壓時間x聲速(340M/S) )/ 2。