Arduino Lab 2 - 控制LED燈光亮度

Lab目的︰

• 利用 PWM (Pulse Width Modulation, 脈衝寬度調變) 控制LED燈光亮度。

元件︰

• LED x 1
• 220Ω 電阻 x 1

接線圖︰

架構圖︰

程式碼︰

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const int ledPin = 9; int brightness = 0; int fadeAmount = 5; void setup() { pinMode(ledPin, OUTPUT); } void loop() { analogWrite(ledPin, brightness); brightness = brightness + fadeAmount; if ( brightness == 0 || brightness == 255 ) { fadeAmount = -fadeAmount; } delay(20); }