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由樹 岡宮
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第17回 IoTLTで発表した「A」の資料です。 Aはアンペア、USB電源供給のデバイスに対する電流計の発表です。
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A (アンペア usb電源を測る1500円電流計)
1.
© 2015 Renesas
Electronics Corporation. All rights reserved. A 2016年7月19日 バージョン1.0 岡宮 由樹 主任 グローバルセールスマーケティング本部 ルネサスエレクトロニクス株式会社 @第17回 IoTLT
2.
© 2015 Renesas
Electronics Corporation. All rights reserved. 自己紹介 ページ 2 岡宮 由樹(おかみや ゆうき) ルネサスエレクトロニクス株式会社 がじぇるね運営 ・プラットフォーム企画 ・イベント運営 ・Webメンテ 半導体の会社
3.
© 2015 Renesas
Electronics Corporation. All rights reserved. A -> アンペア ページ 3 電流の単位 (国際単位系SIの7つの内の1つ) アンペールの法則に名を残すアンドレ=マリ・アンペール から命名 1 アンペアは導体の断面を 1 秒間に 1 クーロン※の電荷が 流れる場合の電流 (A = C/s) と定義することができる。 http://cdn.amanaimages.com/ から引用 出典:ウィキペディア ja.wikipedia.org/ ※1 クーロンは約6.24×1018 個の荷電粒子
4.
© 2015 Renesas
Electronics Corporation. All rights reserved. IoTデバイスの電源をどうするか? ページ 4 プロトタイプ時、製品化時、用途に合わせた電源を選ばないといけない。 ケースに入れる大きさや、電池交換の検討が必要 乾電池5本
5.
© 2015 Renesas
Electronics Corporation. All rights reserved. バッテリーの電流容量 目安 ページ 5 品物 電圧 電流容量(目安) ※製品によるので あくまで目安です モバイルバッテリー 5.0V 3000mAH リチウムポリマー 3.7V 400mAH CR2032 3.0V 220mAH 単三アルカリ 1.5V 950mAH リチウムポリマー モバイルバッテリー
6.
© 2015 Renesas
Electronics Corporation. All rights reserved. 電流測定 ページ 6
7.
© 2015 Renesas
Electronics Corporation. All rights reserved. USB接続時の電流を測りたいが → 結構大変 ページ 7 電流計は直列に入れないといけない。 USBの信号線を切るのが大変 デバ イス A 電流計 基板には 電流計を入れる なかなか余地がない
8.
© 2015 Renesas
Electronics Corporation. All rights reserved. 便利なものがあった ページ 8 iPhone充電中 0.98A流れている
9.
© 2015 Renesas
Electronics Corporation. All rights reserved. GR-COTTONの電流を測ってみたが・・。 ページ 9 電流がゼロ!? GR-COTTON
10.
© 2015 Renesas
Electronics Corporation. All rights reserved. 小さな電流を測れるモジュールを買ってみた ページ 10 Adafruit INA219モジュール ・電源電圧:3.3V~5V ・最大計測電圧:MAX+26VDC ・最大計測電流:±3.2A ・レンジ:4レンジ選択 ・ロジックレベル:TTL(3-5V) ・通信形式:I2C(プルアップ抵抗実装済み) ・通信速度:MAX 40KHz 測定分解能は±0.8mA
11.
© 2015 Renesas
Electronics Corporation. All rights reserved. USBラインを分断して電流計を入れる ページ 11 ブレッドボードで USBラインを分断
12.
© 2015 Renesas
Electronics Corporation. All rights reserved. INA219モジュールを接続 ページ 12 INA219モジュール。 測定結果はI2Cで取得
13.
© 2015 Renesas
Electronics Corporation. All rights reserved. Adafruitのライブラリをダウンロード ページ 13 測れた!
14.
© 2015 Renesas
Electronics Corporation. All rights reserved. 買ったばかりの“KONASHI2” ページ 14 BLEでペアリングして 4mA~8mA
15.
© 2015 Renesas
Electronics Corporation. All rights reserved. GR-PEACH + LCDパネル ページ 15 400mAぐらい
16.
© 2015 Renesas
Electronics Corporation. All rights reserved. GR-COTTON ページ 16 10mA流れる
17.
© 2015 Renesas
Electronics Corporation. All rights reserved. FTDI ページ 17 つなぐだけで 9mA流れる
18.
© 2015 Renesas
Electronics Corporation. All rights reserved. USBの根っこから測れる簡易電流計 ページ 18 品物 単価 個数 INA219モジュール 1,080円 1 USB DIP化キット 120円 2 ブレッドボード 130円 1 USB A(オス) (オス)ケーブル 290円 1 ワイヤー 8本 ArduinoやGR-COTTONなど ArduinoやGRボードがあれば、 だいたい 1500円でUSB電流計が作れる!
19.
© 2015 Renesas
Electronics Corporation. All rights reserved. ページ 19 VBUS D+ D- GND VBUS D+ D- GND Vin+ Vin- Sda Scl GND DA CL VCC + - 接続構成 電源供給する PCやモバイル バッテリーへ 測定したい デバイスへ PCへ (測定用)
20.
© 2015 Renesas
Electronics Corporation. All rights reserved. まとめ ページ 20 ・IoTデバイスの開発で電流値を見ておくことは大切 →ケースに入れる大きさや、電池交換の検討が必要 ・USBの根っこから電流計はブレッドボードで作れる ・簡易測定は1500円くらいからできる ※ArduinoやGR-COTTONなど持っている場合
21.
© 2015 Renesas
Electronics Corporation. All rights reserved. がじぇるねから宣伝 ページ 21 ”がじぇるね“で 検索してください
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