Arduino入门函数笔记

1、setup()

当Arduino开始的时候被调用。用它来初始化变量,设置引脚运行模式,启动库文件等。setup函数只运行一次,每次上电或者被重置时候调用。

int buttonPin = 3;void setup(){  Serial.begin(9600);  pinMode(buttonPin, INPUT);}void loop(){  // ...}

2、loop()

创建setup()时，该函数设置初始值等一些初始化操作。该函数是Arduino运行控制的函数，所有的实时控制逻辑都在该方法内执行。

const int buttonPin = 3;// setup initializes serial and the button pinvoid setup(){  Serial.begin(9600);  pinMode(buttonPin, INPUT);}// loop checks the button pin each time,// and will send serial if it is pressedvoid loop(){  if (digitalRead(buttonPin) == HIGH)    Serial.write('H');  else    Serial.write('L');  delay(1000);}

3、pinMode()

配置指定的引脚的输入或输出模式。

模式类型: INPUT, OUTPUT, or INPUT_PULLUP.

int ledPin= 13;                // LED connected to digital pin 13

void setup()
{
  pinMode(ledPin,OUTPUT);      // sets the digital pin as output
}

void loop()
{
  digitalWrite(ledPin,HIGH);  // sets the LED on
  delay(1000);                  // waits for a second
  digitalWrite(ledPin,LOW);    // sets the LED off
  delay(1000);                  // waits for a second
}

4、digitalWrite()

向指定引脚输出控制信号HIGH或者LOW。

int ledPin = 13;                 // LED connected to digital pin 13void setup(){  pinMode(ledPin, OUTPUT);      // sets the digital pin as output}void loop(){  digitalWrite(ledPin, HIGH);   // sets the LED on  delay(1000);                  // waits for a second  digitalWrite(ledPin, LOW);    // sets the LED off  delay(1000);                  // waits for a second}

5、digitalRead()

读取指定引脚的值HIGH或者LOW。

int ledPin= 13; // LED connected to digital pin 13
int inPin = 7;  // pushbutton connected to digital pin 7
int val = 0;    // variable to store the read value
                                       
void setup()
{
  pinMode(ledPin,OUTPUT);      // sets the digital pin 13 as output
  pinMode(inPin,INPUT);      // sets the digital pin 7 as input
}
        
void loop()
{
  val = digitalRead(inPin);  // read the input pin
  digitalWrite(ledPin, val);    // sets the LED to the button's value
}