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2017 Week 4 GPIO-Seven Segment Display
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2017 Week 4 GPIO-Seven Segment Display
1.
GPIO輸/出入訊號練習: 計時器 日期:2017/3/18
2.
七段顯示器 • 七段顯示器的內部結構,可以分成兩種: • 共陽極,各段LED的陽極(正極)是相連通的 •
共陰極,各段LED的陰極(負極)是相連通的 共陽極 共陰極 接3.3V或5V腳位 接Ground腳位
3.
共陰極七段顯示器 A B C
D E F G DP Ground Ground
4.
顯示數字 A B
C D DP E F G 0 1 1 1 1 1 1 1 0 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 0 1 1 1 1 1 0 1 1 0 1 1 1 0 0 1 1 1 0 1 1 1 0 1 1 1 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0
5.
6.
設定七段顯示器連接的GPIO腳位 設定七段顯示器要顯示的數字 設定GPIO腳位為訊號輸出 七段顯示器發亮
7.
計時10秒
8.
作業二基本題:LED燈結合七段顯示器實作作業-模擬紅綠燈顯示倒數時間 紅綠燈(A) 階段一:A紅燈和B綠燈同時發亮。 階段二:B綠燈恆亮10秒後滅燈,然後B黃燈1秒閃爍 一次,同時七段顯示器從5秒開始倒數並閃 爍,總共閃爍5次,然後B黃燈和七段顯示器 滅燈,B紅燈恆亮15秒,A紅燈滅燈,A綠燈 恆亮10秒。 階段三:A綠燈恆亮10秒後滅燈,然後A黃燈1秒閃爍 一次,同時七段顯示器從5秒開始倒數並閃 爍,總共閃爍5次,然後A黃燈和七段顯示器 滅燈,A紅燈恆亮15秒,B紅燈滅燈,B綠燈 恆亮10秒。 *反覆執行階段一、二、三 *閃爍的定義:燈亮,燈滅算閃爍一次 8 紅綠燈(A)
9.
作業二加分題:使用LED燈結合兩個七段顯示器模擬真實道路紅綠燈 *兩組(A和B)紅綠燈 階段一:A紅燈發亮,七段顯示器開始倒數A紅燈顯示秒數 25秒, A紅燈亮5秒後,B綠燈發亮。 階段二:B綠燈恆亮10秒後滅燈,然後B黃燈恆亮5秒後滅燈, B紅燈恆亮5秒後,A紅燈滅燈,七段顯示器滅燈, B紅燈持續恆亮15秒(紅燈總共亮25秒),A綠燈恆亮 10秒。 階段三:A綠燈恆亮10秒後滅燈,然後A黃燈恆亮5秒後滅燈, 七段顯示器開始倒數A紅燈顯示秒數25秒,A紅燈恆 亮5秒後,B紅燈滅燈,A紅燈持續恆亮15秒,B綠 燈恆亮10秒。 *反覆執行階段二、三 *閃爍的定義:燈亮,燈滅算閃爍一次 使用兩個七段顯示器
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