赤外線
http://www.optdevice.jp/ir/

obniz IR LED
https://obniz.com/sdk/parts/InfraredLED/README.md

赤外線リモコンのフォーマット
https://os.mbed.com/users/shintamainjp/notebook/remote_ir_ja/
http://elm-chan.org/docs/ir_format.html

アレクサスキル
https://medium.com/crowdbotics/how-to-build-a-custom-amazon-alexa-skill-step-by-step-my-favorite-chess-player-dcc0edae53fb

オペアンプ
https://akizukidenshi.com/catalog/g/gI-09406/

ad
https://developer.amazon.com/en-US/docs/alexa/custom-skills/understanding-custom-skills.html
smart home skill (not what i need)
https://developer.amazon.com/en-US/docs/alexa/smarthome/understand-the-smart-home-skill-api.html

JS function
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions
To return a value other than the default, a function must have a return statement that specifies the value to return. A function without a return statement will return a default value. In the case of a constructor called with the new keyword, the default value is the value of its this parameter. For all other functions, the default return value is undefined.

Promise
https://javascript.info/promise-basics

アレクサ、Obniz、
https://speakerdeck.com/miso/alexaxobnizdevui-iotwohazimeyou

package.jsonにこのライブラリー名を追加する
「,
"obniz": "^3.9.0"」

Speech Synthesis Markup Language (SSML)
https://developer.amazon.com/en-US/docs/alexa/custom-skills/speech-synthesis-markup-language-ssml-reference.html

let, var, const js
https://www.freecodecamp.org/news/var-let-and-const-whats-the-difference/#:~:text=var%20declarations%20are%20globally%20scoped%20or%20function%20scoped%20while%20let,be%20updated%20nor%20re%2Ddeclared.

alexa hosted skill
https://developer.amazon.com/en-US/docs/alexa/hosted-skills/build-a-skill-end-to-end-using-an-alexa-hosted-skill.html

async-await
https://www.freecodecamp.org/news/async-await-javascript-tutorial/

event-driven programming
webhook
event loop