37 lines
675 B
Arduino
37 lines
675 B
Arduino
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//www.elegoo.com
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//2016.12.9
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int lightPin = 0;
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int latchPin = 11;
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int clockPin = 9;
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int dataPin = 12;
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int leds = 0;
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void setup()
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{
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pinMode(latchPin, OUTPUT);
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pinMode(dataPin, OUTPUT);
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pinMode(clockPin, OUTPUT);
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}
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void updateShiftRegister()
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{
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digitalWrite(latchPin, LOW);
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shiftOut(dataPin, clockPin, LSBFIRST, leds);
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digitalWrite(latchPin, HIGH);
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}
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void loop()
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{
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int reading = analogRead(lightPin);
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int numLEDSLit = reading / 57; //1023 / 9 / 2
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if (numLEDSLit > 8) numLEDSLit = 8;
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leds = 0; // no LEDs lit to start
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for (int i = 0; i < numLEDSLit; i++)
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{
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leds = leds + (1 << i); // sets the i'th bit
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}
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updateShiftRegister();
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}
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