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39 lines
661 B
Plaintext
39 lines
661 B
Plaintext
15 years ago
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const int pins[] = {2, 3, 4, 5};
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void setup() {
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for(int p=0; p<=2; p++) {
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pinMode(pins[p], INPUT);
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}
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}
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const int charlieplexed[12][4] =
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{
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{ 1,0,-1, -1},
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{ 0,1,-1, -1},
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{-1,1, 0, -1},
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{-1,0, 1, -1},
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{-1,-1,1, 0},
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{-1,-1,0, 1},
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{1,-1, 0, -1},
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{0,-1, 1, -1},
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{-1,1,-1, 0},
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{-1,0,-1, 1},
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{1,-1,-1, 0},
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{0,-1,-1, 1},
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};
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void loop() {
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for(int i=0; i<=11; i++) {
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// set pin tristate
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for(int p=0; p<=3; p++) {
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if (charlieplexed[i][p] == -1) {
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pinMode(pins[p], INPUT);
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} else {
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pinMode(pins[p], OUTPUT);
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digitalWrite(pins[p], charlieplexed[i][p]);
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}
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}
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delay(200);
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}
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}
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