Arduino UNO學習321．電位器類比控制閃燈

Arduino學習321．類比控制閃燈

硬體,可變電阻*1

↓打開內建範例,,檔案>範例>Analog>AnalogInput

int sensorPin = A0;    // select the input pin for the potentiometer

int ledPin = 13;      // select the pin for the LED

int sensorValue = 0;  // variable to store the value coming from the sensor

void setup() {

  // declare the ledPin as an OUTPUT:

  pinMode(ledPin, OUTPUT);

}

void loop() {

  // read the value from the sensor:

  sensorValue = analogRead(sensorPin);

  // turn the ledPin on

  digitalWrite(ledPin, HIGH);

  // stop the program for <sensorValue> milliseconds:

  delay(sensorValue);

  // turn the ledPin off:

  digitalWrite(ledPin, LOW);

  // stop the program for for <sensorValue> milliseconds:

  delay(sensorValue);

}

上傳後調整電阻試試，內建Pin13的LED燈會變快閃慢閃,

再來試著打開ArduBlock拼圖如下↓

void setup()

{

        pinMode( 13 , OUTPUT);

Serial.begin(9600);

}

void loop()

{

        digitalWrite( 13 , HIGH );

        delay( analogRead(0) );

        digitalWrite( 13 , LOW );

Serial.print( analogRead(0) );

Serial.println();

        delay( 100 );

}

上傳後打開監控視窗,調整可變電阻,可得到數據,並控制LED閃燈秒差,

數位訊號只有開和關,0和1的訊號,並無法像PWM訊號調整亮度,

學習了腳位功能有何不同嗎?

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