mirror of
https://github.com/PaulStoffregen/Tlc5940
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49 lines
1.4 KiB
Plaintext
49 lines
1.4 KiB
Plaintext
/*
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A circular light buffer. If you manage to construct a circle of LEDs,
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definitely send in pictures. What this sketch does is take an analog
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reading off of analog pin 0 and add it to the current value of the last LED.
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If the resultant sum is greater than 4095, it turns the LED off,
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otherwise sets LED 0 to the value of the sum.
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If you ground pin 12, it will set LED 0 to zero.
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Then it shifts all the LED values up one (so LED 0 becomes LED 1) and sets
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LED 0 to the value shifted off the last LED (so if one LED is on, it will
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go in a circle forever).
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See the BasicUse example for hardware setup.
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Alex Leone <acleone ~AT~ gmail.com>, 2009-02-04 */
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#include "Tlc5940.h"
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#include "tlc_shifts.h"
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// which analog pin to use
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#define ANALOG_PIN 0
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// which pin to clear the LEDs with
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#define CLEAR_PIN 12
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// how many millis for one full revolution over all the LEDs
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#define SCOPE_PERIOD (2000 * NUM_TLCS)
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#define LED_PERIOD SCOPE_PERIOD / (NUM_TLCS * 16)
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void setup()
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{
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pinMode(CLEAR_PIN, INPUT);
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digitalWrite(CLEAR_PIN, HIGH); // enable pull-up
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Tlc.init();
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}
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void loop()
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{
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// shiftUp returns the value shifted off the last pin
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uint16_t sum = tlc_shiftUp() + analogRead(ANALOG_PIN) * 4;
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if (digitalRead(CLEAR_PIN) == LOW || sum > 4095)
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sum = 0;
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Tlc.set(0, sum);
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Tlc.update();
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delay(LED_PERIOD);
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}
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