photoresistor的基础操作

#define LDR_PIN A0void setup() {// put your setup code here, to run once:Serial.begin(9600);
}void loop() {// put your main code here, to run repeatedly:int lightLevel;lightLevel = analogRead(LDR_PIN);Serial.println(lightLevel);delay(500);
}

函数说明

• analogRead（）：模拟引脚数据读取，获取模拟信号。
  

根据亮度控制灯光

#define LDR_PIN A0
#define LED D4// 阈值，光照的阈值
int threshold = 400;void setup() {// put your setup code here, to run once:Serial.begin(9600);pinMode(LED,OUTPUT);
}void loop() {// put your main code here, to run repeatedly:int lightLevel;// 获取光照强度lightLevel = analogRead(LDR_PIN);Serial.println(lightLevel);delay(500);// 根据光照强度决定灯是否亮if(lightLevel < threshold) {digitalWrite(LED,HIGH);}else{digitalWrite(LED,LOW);}}