一：digitalRead  初始化数字端口读取0-13；

int Led = 13;

digitalRead (Led,OUTPUT);

二：analogRead  读取传感器的模拟值并赋给val,读取的针脚未A0-A5

int val; 

val = analogRead(0)

红外感应代码

int Sensor = 0;

int temp = 1;

void setup() {

  Serial.begin(9600);

  pinMode(Sensor,INPUT);

}

void loop(){

    page();

}

void page() {

  int SensorInt = digitalRead(Sensor);

  if( SensorInt != temp)

  {

    temp = SensorInt;

    if(temp == 0) Serial.print("手伸进来了");

    else Serial.print("手伸出去了");

    Serial.println(SensorInt);

  }

  delay(50);

}

压力感应代码

int fsrPin = 0;

int fsrReading;

int fsrReadingTemp = 0;

void setup() {

  Serial.begin(9600);

}

void loop() {

  fsrReading = analogRead(fsrPin);

  if (fsrReadingTemp != fsrReading) {

    fsrReadingTemp = fsrReading;

    Serial.print("Analog reading = ");

    Serial.println(fsrReading);

  }

  delay(100);

}