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現在の天候状況をKeyestudio_HT16K33に表示してみた

Last updated at Posted at 2022-12-12

はじめに

この記事は、obniz性能を検証するために、Openweather APIを用いて、現在の天候状況をKeyestudio_HT16K33に表示してみた。

備考:Keyestudio_HT16K33の表示範囲の限界があるため、天候状況を表す英単語の先頭文字を抽出して表示した。例えば、曇りの場合は、Cloud⇒C;晴れの場合は、Sun⇒S

必要なもの

(1)obniz board

(2)Keyestudio_HT16K33
(3)Openweather API
(4)Wi-Fi

Openweather APIの発行

Openweatherの公式サイト:ここから

実装

APIから取得したJsonを日本語化しないので、そのままで使う。 以下はコードです。
weather_API.js
const location = "Tokyo";
const APIKEY = 'Your APIKEY';

obniz.onconnect = async function() {
    matrix = obniz.wired("Keyestudio_HT16K33", { 
      gnd:0, 
      vcc:1, 
      sda:2, 
      scl:3
    });
};

obniz.onloop = async function() {
   const data = await (await fetch(`https://api.openweathermap.org/data/2.5/weather?q=${location}&units=metric&appid=${APIKEY}`
    )).json();
    
    const currentWeather = data.weather[0].main;
    
    matrix.brightness(7);    
    const ctx = obniz.util.createCanvasContext(matrix.width, matrix.height);
    ctx.fillStyle = "black";
    ctx.fillRect(0, 0, matrix.width, matrix.height);
    ctx.fillStyle = "white";
    ctx.font = "7px sans-serif";
    const text = currentWeather.slice( 0, 1 ) //現在の天候状況を表す英単語の先頭文字を抽出
    ctx.fillText(text, 1, 7);
    matrix.draw(ctx);
}

プレゼンテーション1.jpg

ちなみに、天候状況を表す英単語は:
"Rain",
"Snow",
"Thunderstorm",
"Drizzle",
"Fog",
"Squall",
"Clouds",
"Mist",
"Smoke",
"Dust",
"Haze",
"Sand",
"Ash",
"Tornado",
"Sun",

さいごに

Obnizで実装するのは意外と簡単でした。次回MatrixLED_MAX7219をやってみる。
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