33 lines
942 B
C++
33 lines
942 B
C++
#include <Arduino.h>
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#include <inttypes.h>
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#ifndef _UNITS_H
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#define _UNITS_H
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// MiLight CCT bulbs range from 2700K-6500K, or ~370.3-153.8 mireds.
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#define COLOR_TEMP_MAX_MIREDS 370
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#define COLOR_TEMP_MIN_MIREDS 153
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class Units {
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public:
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template <typename T, typename V>
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static T rescale(T value, V newMax, float oldMax = 255.0) {
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return round(value * (newMax / oldMax));
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}
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static uint8_t miredsToWhiteVal(uint16_t mireds, uint8_t maxValue = 255) {
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return rescale<uint16_t, uint16_t>(
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constrain(mireds, COLOR_TEMP_MIN_MIREDS, COLOR_TEMP_MAX_MIREDS) - COLOR_TEMP_MIN_MIREDS,
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maxValue,
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(COLOR_TEMP_MAX_MIREDS - COLOR_TEMP_MIN_MIREDS)
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);
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}
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static uint16_t whiteValToMireds(uint8_t value, uint8_t maxValue = 255) {
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uint16_t scaled = rescale<uint16_t, uint16_t>(value, (COLOR_TEMP_MAX_MIREDS - COLOR_TEMP_MIN_MIREDS), maxValue);
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return COLOR_TEMP_MIN_MIREDS + scaled;
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}
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};
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#endif
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