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| 1 | +# 📌 RGB LED |
| 2 | + |
| 3 | + |
| 4 | + |
| 5 | +공통핀과 3개의 R,G,B 제어핀으로 구성 |
| 6 | + |
| 7 | +공동 양극방식(common anode)의 경어 제어판에 GND로 출력하면 켜짐 |
| 8 | + |
| 9 | +### ✔ 연결방법 |
| 10 | + |
| 11 | + |
| 12 | + |
| 13 | +### ✔ 밝기 조절 |
| 14 | + |
| 15 | +- 최대 밝기 : analogWrite(0) |
| 16 | + |
| 17 | +- 최소 밝기 : analogWrite(255) |
| 18 | + |
| 19 | + |
| 20 | +### ✔ 예시 |
| 21 | + |
| 22 | +- RGB LED 밝기 조절 |
| 23 | + ```js |
| 24 | + int RGB_LED[] = {6,7,8}; |
| 25 | + |
| 26 | + void setup(){ |
| 27 | + for (int i=0; i<3; i++){ |
| 28 | + pinMode(RGB_LED[i], OUTPUT); |
| 29 | + } |
| 30 | + } |
| 31 | + |
| 32 | + void loop(){ |
| 33 | + // Adjusting Blue color |
| 34 | + digitalWrite(RGB_LED[1], HIGH); |
| 35 | + digitalWrite(RGB_LED[2], HIGH); |
| 36 | + for (int i=255; i>=0; i--){ |
| 37 | + analogWrite(RGB_LED[0], i); |
| 38 | + delay(10); |
| 39 | + } |
| 40 | + } |
| 41 | + |
| 42 | + ``` |
| 43 | + |
| 44 | +- 가변저항사용 -> LED밝기조절 ; 방법1 |
| 45 | + |
| 46 | + ```js |
| 47 | + int pins_LED[] = {2, 3, 4, 5}; // Pins connected to LEDs |
| 48 | +
|
| 49 | + void setup() { |
| 50 | + Serial.begin(9600); |
| 51 | + for (int i = 0; i < 4; i++) { |
| 52 | + pinMode(pins_LED[i], OUTPUT); |
| 53 | + } |
| 54 | + pinMode(A0, INPUT); // Pin A0 connected to a Potentiometer |
| 55 | + } |
| 56 | +
|
| 57 | + void loop() { |
| 58 | + int ADC_value = analogRead(A0); // ADC value |
| 59 | + int PWM_value = ADC_value >> 2; // PWM value |
| 60 | + Serial.print(String("ADC value : ") + ADC_value); |
| 61 | + Serial.println(String(", PWM value : ") + PWM_value); |
| 62 | + for (int i = 0; i < 4; i++) { |
| 63 | + // Adjusting the brightness of LEDs |
| 64 | + analogWrite(pins_LED[i], PWM_value); |
| 65 | + } |
| 66 | + delay(1000); |
| 67 | + } |
| 68 | +
|
| 69 | + ``` |
| 70 | +- 가변저항사용 -> LED밝기조절 ; 방법2 |
| 71 | + |
| 72 | + ```js |
| 73 | + int pins_LED[] = {2, 3, 4, 5}; // Pins connected to LEDs |
| 74 | +
|
| 75 | + void setup() { |
| 76 | + Serial.begin(9600); |
| 77 | + for (int i = 0; i < 4; i++) { |
| 78 | + pinMode(pins_LED[i], OUTPUT); |
| 79 | + } // Pin A0 connected to a Potentiometer |
| 80 | + pinMode(A0, INPUT); |
| 81 | + } |
| 82 | +
|
| 83 | + void loop() { |
| 84 | + int ADC_value = analogRead(A0); // ADC value |
| 85 | + int PWM_value[4] = {0, }; |
| 86 | + Serial.println(String("ADC value : ") + ADC_value); |
| 87 | + for (int i = 3; i >= 0; i--) { |
| 88 | + // Calculating the brightness of each LED |
| 89 | + if (ADC_value >= 256 * i) { |
| 90 | + PWM_value[i] = ADC_value - 256 * i; |
| 91 | + ADC_value -= (PWM_value[i] + 1); |
| 92 | + } // Adjusting the brightness of LEDs |
| 93 | + analogWrite(pins_LED[i], PWM_value[i]); |
| 94 | + Serial.print(" "); |
| 95 | + Serial.print(PWM_value[i]); |
| 96 | + } |
| 97 | + Serial.println(); |
| 98 | + delay(500); |
| 99 | + } |
| 100 | + ``` |
| 101 | + |
| 102 | + |
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