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標題: Arduino VS photoresistor [打印本頁]

作者: liuyang 時間: 2013-7-18 04:24
標題: Arduino VS photoresistor

程序如下：

const int sensorMin = 0; // sensor minimum, discovered through experiment 模擬口讀到的值的最小值，由實驗得
const int sensorMax = 600; // sensor maximum, discovered through experiment 模擬口讀到的值的最大值，由實驗得
//*有以上可知，光敏電阻的阻值大概在0到24k左右

void setup() {
// initialize serial communication:
Serial.begin(9600);
}

void loop() {
// read the sensor:
int sensorReading = analogRead(0);
// map the sensor range to a range of four options:
int range = map(sensorReading, sensorMin, sensorMax, 0, 3);//此命令非常巧妙，直接把讀來的模擬值轉化成了對應得0-3的整型值

// do something different depending on the
// range value:
switch (range) { //使用switch命令，對0-3四種情況區別對待，數值越小，代表亮度越低
case 0: // your hand is on the sensor
   Serial.println("dark");delay(100);
   break;
case 1: // your hand is close to the sensor
   Serial.println("dim");delay(100);
   break;
case 2: // your hand is a few inches from the sensor
   Serial.println("medium");delay(100);
   break;
case 3: // your hand is nowhere near the sensor
   Serial.println("bright");delay(100);
   break;
}

}

連接圖：

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