# Arduino Note

###### tags: `DIT`

## IO

void setup(){
    pinMode(pin, OUTPUT);
    pinMode(pin, INPUT);
}

void loop(){
    digitalWrite(pin, signal); //signal: 1/HIGH or 0/LOW
    analogWrite(pin, value); //value: 0~255. it is PWM output.
    x = digitalRead(pin); //return 1 or 0
    x = analogRead(pin); //return 0~255
    delay(ms); //delay ms
}

## Serial Port

void setup(){
    Serial.begin(baud_rate); //baud rate: 9600 or 115200, 要記得在serial port的介面選擇
}

void loop(){
    Serial.print(something);
    Serial.println(something); //會換行
    if(Serial.available()){ //如果serial port 有資料輸入，會回傳大於0的數
        c = Serial.read(); //read and return char
        x = Serial.parseInt(); //read and return int
    }
    
}

## servo

#include <Servo.h>
Servo myServo; //宣告一個物件

void setup(){
    myServo.attach(pin); //pin with pwm output
}

void loop(){
    myServo.write(angle); //angle: 0~180
}