霍爾感測器-Hall Effect Sensor
硬體組陳柏旭
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利用霍爾效應於AUV之開關
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霍爾感測器之工作原理
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霍爾電壓
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在導體上通過電流,並在垂直電流方向施以外加磁場時,電子會受到勞倫茲力(Lorentz force)擠壓到一端,進而產生微弱電壓,就是霍爾電壓 ( Hall Voltage )。
霍爾效應感測器( Hall Effect Sensor )的基本配置包含一個霍爾元件(將磁場轉換為電壓),以及運算放大器等處理電路。
霍爾感測元件感應磁場之後而得到的電壓是一種類比訊號,在霍爾感測器的內部,會經過施密特觸發器將訊號轉換成高或低的數位訊號來輸出,方便輸入到MCU的GPIO腳位做後續控制。
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Keyes 霍爾開關模組 A3144
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工作電壓:3V-5V(DC)
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尺寸:22 * 38 mm
使用Arduino UNO板測試Keyes 霍爾開關模組
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以下為實作的程式碼
已確認霍爾開關之磁力來源只受到測試磁鐵影響,且磁力可穿透壓克力防水護罩。
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尚待確認實驗
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內部供給電流是否會導致模組燒壞
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其他元件工作時磁力是否會影響開關