Created
November 1, 2021 18:07
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Controls an RGB LED with ESP32 WROOM
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#include <Arduino.h> | |
#define R_LED_PIN 32 | |
#define G_LED_PIN 33 | |
#define B_LED_PIN 25 | |
#define R_CH 0 | |
#define G_CH 1 | |
#define B_CH 2 | |
typedef struct RgbColor | |
{ | |
unsigned char r; | |
unsigned char g; | |
unsigned char b; | |
} RgbColor; | |
typedef struct HsvColor | |
{ | |
unsigned char h; | |
unsigned char s; | |
unsigned char v; | |
} HsvColor; | |
RgbColor HsvToRgb(HsvColor hsv) | |
{ | |
RgbColor rgb; | |
unsigned char region, remainder, p, q, t; | |
if (hsv.s == 0) | |
{ | |
rgb.r = hsv.v; | |
rgb.g = hsv.v; | |
rgb.b = hsv.v; | |
return rgb; | |
} | |
region = hsv.h / 43; | |
remainder = (hsv.h - (region * 43)) * 6; | |
p = (hsv.v * (255 - hsv.s)) >> 8; | |
q = (hsv.v * (255 - ((hsv.s * remainder) >> 8))) >> 8; | |
t = (hsv.v * (255 - ((hsv.s * (255 - remainder)) >> 8))) >> 8; | |
switch (region) | |
{ | |
case 0: | |
rgb.r = hsv.v; rgb.g = t; rgb.b = p; | |
break; | |
case 1: | |
rgb.r = q; rgb.g = hsv.v; rgb.b = p; | |
break; | |
case 2: | |
rgb.r = p; rgb.g = hsv.v; rgb.b = t; | |
break; | |
case 3: | |
rgb.r = p; rgb.g = q; rgb.b = hsv.v; | |
break; | |
case 4: | |
rgb.r = t; rgb.g = p; rgb.b = hsv.v; | |
break; | |
default: | |
rgb.r = hsv.v; rgb.g = p; rgb.b = q; | |
break; | |
} | |
return rgb; | |
} | |
void setup() { | |
Serial.begin(115200); | |
ledcAttachPin(R_LED_PIN, R_CH); | |
ledcAttachPin(G_LED_PIN, G_CH); | |
ledcAttachPin(B_LED_PIN, B_CH); | |
ledcSetup(R_CH, 1000, 8); | |
ledcSetup(G_CH, 1000, 8); | |
ledcSetup(B_CH, 1000, 8); | |
} | |
int i = 0; | |
void loop() { | |
HsvColor hsv; | |
hsv.h = i; | |
hsv.s = 255; | |
hsv.v = 255; | |
RgbColor rgb = HsvToRgb(hsv); | |
ledcWrite(R_CH, rgb.r); | |
ledcWrite(G_CH, rgb.g); | |
ledcWrite(B_CH, rgb.b); | |
i++; | |
if (i > 255) { | |
i = 0; | |
} | |
delay(10); | |
} |
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