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#define LED 2

void setup() {
  // LEDに接続したピンを「出力（OUTPUT）」に設定
  pinMode(LED, OUTPUT);
}

void loop() {
  // LEDを点灯
  digitalWrite(LED, HIGH);

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基本の書き方
[表示名](#ヘッダー名)

例
----------------
# LINK
 - [hoge](#hoge)
 - [fuga](#fuga)

### hoge

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const int motorA[3] = {4, 13, 25};  // AIN1, AIN2, PWMA
const int motorB[3] = {14, 27, 26}; // BIN1, BIN2, PWMB

const int CHANNEL_A = 0;
const int CHANNEL_B = 1;

const int LEDC_TIMER_BIT = 8;
const int LEDC_BASE_FREQ = 490;

void setup() {

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Android StudioでエミュレータをGPU使って起動するコマンド

emulator -avd Nexus_5X_API_28 -gpu host

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E: Unable to parse package file /var/lib/apt/extended_states (1)

というエラーが出たら，

sudo mv /var/lib/apt/extended_states /var/lib/apt/extended_states_tmp

を実行すればよい．

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HardwareSerial gps(2);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("start");
  gps.begin(9600);
}

void loop() {

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++                                                                              
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                

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# Reference:
# https://blog.finxter.com/how-to-use-rot13-in-python/
import argparse

ap = argparse.ArgumentParser()
ap.add_argument('arg1', help='plain text')
ap.add_argument('-n', help='number of rotation')
args = ap.parse_args()

cleartxt = args.arg1

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from PIL import Image
import sys
import csv

import argparse

ap = argparse.ArgumentParser()
ap.add_argument('-e', help='path to encode image file')
ap.add_argument('-d', help='path to decode csv file')
args = ap.parse_args()

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from PIL import Image
import sys
import csv

import argparse

ap = argparse.ArgumentParser()
ap.add_argument('-c', help='path to cover image file')
ap.add_argument('-s', help='path to secret image file')
ap.add_argument('-d', help='path to decode image file')