Arduino Lab 5 - 光敏電阻控制LED

Lab目的︰

• 使用光敏電阻來控制LED亮暗。

元件︰

• LED x 1
• 220Ω 電阻 x 1
• 10KΩ 電阻 x 1
• 5516光敏電阻 x 1

接線圖︰

架構圖︰

程式碼︰

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const int photocellPin = 2; const int ledPin = 13; const int minLight = 500; //最低亮度 int photocellVal = 0; int ledState = 0; void setup() { // Serial.begin(9600); pinMode(ledPin, OUTPUT); } void loop() { photocellVal = analogRead(photocellPin); // Serial.println(photocellVal); if (photocellVal < minLight && ledState == 0) { digitalWrite(ledPin, HIGH); ledState = 1; } if (photocellVal > minLight && ledState == 1) { digitalWrite(ledPin, LOW); ledState = 0; } delay(200); }