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[Elementary school mom must-see] Reliable to look like "Oshikatsu goods"! How to make NFC watching key ring🛡️

This is not just a key chain 🤫

Children's name tags are concerned about personal information....

So I thought about DIY of "watching key ring" equipped with NFC tag!

It is a smart crime prevention goods that displays emergency contacts just by holding the smartphone ✨

[Why this key ring is excellent]

1. Protect privacy: Design that does not dare to put NFC mark. Because it looks like just a recommended item, personal information is usually not exposed.

2. Reliable in case of emergency: When lost or injured, the person who picked it up can contact you immediately.

3. OK with familiar tools: You can make it with convenience store printing or acrylic case that you can buy on the net.

If you are not good at DIY, if you want a high-quality professional, please contact "Oshishimo Touch"!

We also accept custom-made production 🍋

NFC KEY HOLDER DIY Lost Child Countermeasure # tag # watch # elementary _ school# Goods _ Activity

2025/10/8 Edited to

... Read more私が「名札に電話番号を書くのはちょっと怖い…」と感じて作ったのが、100均のNFCタグを仕込む“見守りキーホルダー”です。見た目はただの推し活キーホルダーなので普段は個人情報が見えず、必要なときだけスマホをかざして連絡先を出せるのが便利でした。 ■100均で揃えたもの(ダイソー/セリア想定) ・NFCタグ(シール型/カード型) ・アクリルキーホルダーケース(中に紙を入れられるタイプ) ・台紙用の写真(コンビニで写真印刷すると厚みと発色が◎) ・両面テープ/透明テープ(固定用) ※店舗により品揃えが違うので、「nfcタグ 100均」「nfcタグ ダイソー」「nfcタグ セリア」で事前に在庫感をチェックするとスムーズです。 ■作り方(ざっくり) 1) まずNFCタグに“表示したい内容”を登録 迷子時に必要な情報だけに絞るのがコツ。私は「保護者の電話番号」「家族の別番号」「アレルギーの有無」「近所の目印」程度にしました。URLに飛ばす方式(例:連絡先ページ)だと編集が楽ですが、個人情報を載せすぎないよう注意。 2) 見た目は推しグッズに コンビニで写真印刷した推し画像を台紙にして、アクリルケースへ。NFCマークはあえて付けず“普通のキーホルダー感”を優先しました。 3) NFCタグを中に固定 台紙の裏やケースの内側にNFCタグを貼り、動かないよう透明テープで補強。厚みが出すぎるとケースが閉まらないので、シール型NFCタグだとやりやすいです。 4) 動作チェック iPhone/Androidで実際にかざして反応するか確認。反応しにくいときは、タグの位置を表側に寄せたり、金属パーツ(キーリング)から少し離すと改善することがあります。 ■「スマホがNFC非対応」だった場合は?(外付けの考え方) 最近のスマホはNFC対応が増えましたが、古い機種だと読み取れないことも。家族のスマホで動作確認は必須です。「スマホ NFC 外付け」で探すと外付けリーダー系もありますが、拾ってくれた人が持っている前提になりにくいので、私は“できるだけ一般的な読み取り方法(標準のNFC)”に寄せました。 ■小学生の連絡手段:スマホ以外の選択肢も併用がおすすめ NFCは“拾った人がかざしてくれる”前提なので、普段の連絡には別手段もあると安心です。たとえば、GPS見守り端末、固定電話への連絡ルール、集合場所の決め事など。うちは「困ったら校門前の○○へ」「先生/お店の人に声をかける」をセットで練習しました。 ■最後に:入れる情報は最小限に 便利だからこそ、住所やフルネームを全部入れない・パスコード付きのページにする等、プライバシー優先で設計すると安心です。100均材料でも十分作れたので、“まずは試作”から始めるのがいちばんおすすめでした。

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