---
title: "HDRカメラでメーターからAI自動検針"
url: "https://maker.wiznet.io/matthew/projects/hdrai/"
markdown_url: "https://maker.wiznet.io/matthew/projects/hdrai/md"
type: "UCC: User Created Content"
author: "akino"
author_url: "https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/#h_%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%A0%E9%96%8B%E7%99%BA"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "akino"
original_url: "https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/#h_%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%A0%E9%96%8B%E7%99%BA"
published: "2025-10-28"
language: "en"
likes: 0
views: 809
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# HDRカメラでメーターからAI自動検針

> Spresense + HDR camera + W5500 build for meter reading: capture digits, run OCR on-device or via Drive+GAS, then notify — with wiring/SPI5 and SSL/DHCP tips.

Original author: akino (source: https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/#h_%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%A0%E9%96%8B%E7%99%BA)

## Article

### Overview

This project captures numeric utility meters (water/gas/electricity) with a **Sony Spresense + HDR camera** and performs **AI digit recognition** to auto-read the current value, then **notifies via email/cloud**. Networking is implemented over **wired Ethernet** using a **W5500 add-on**, and the author explores two recognition paths—**Edge-AI on device** and **Cloud-AI via Google Drive + Google Apps Script (GAS)**—to compare their trade-offs. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

---

### Original Language & Author

The original article was published in **Japanese** on **elchika** on **January 26, 2025**. The author, **akino**, combines Spresense, an HDR camera, and a W5500 Ethernet add-on to aim for **battery-powered long-term operation**, while documenting Japanese parts sources and detailed wiring notes. This curation distills the steps and “gotchas” so global readers can reproduce the build without language barriers. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

---

### Key Highlights

**Problem Framing & Motivation**
Manual on-site meter checks are inconvenient; the project **periodically photographs the meter, OCRs the digits, and notifies the user**, making daily usage tracking effortless and enabling earlier detection of issues such as leaks. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Hardware Stack (Spresense + HDR Camera + W5500-Ether)**
The build uses a Spresense main + extension board, the **HDR camera**, a **W5500-Ether add-on (Crane Electronics)** for wired networking, a 2.8-inch ILI9341 TFT-LCD, and a hand-made LCD sub-board. Practical mounting tips include re-focusing for ~10 cm working distance and a ~39° field of view. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Bus/Pins Realities (what actually worked)**
Attempting **SPI4 on the extension board** led to trouble; the author **jumpered the W5500 to the main board’s SPI5** instead. Chip-select was reassigned (e.g., to **JP2-#6 / D19**), and physical constraints (RJ45 clearance) drove these choices—valuable details for anyone routing Ethernet alongside camera/LCD on Spresense. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Software Toolchain & Libraries**
Development is on **Windows 10 with VS Code + PlatformIO**. Libraries include **Adafruit-GFX**, **Adafruit_ILI9341**, and **SSLClient@^1.6.11**; the **W5500 sources are placed under **`**\w5500_src\**` in the project. The post notes a **recent update to the W5500-Ether library** (seen on Jan 23) and mentions future installation via a library manager—useful for maintenance planning. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Two Recognition Paths (Edge vs Cloud)Cloud path**: Upload images to **Google Drive via API**, then run OCR in **GAS** and notify the result. The article documents OAuth steps (client ID/secret, refresh token), finding the folder ID, and configuring **SSL trust anchors** for Google. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Edge path**: Perform the **OCR on Spresense** and notify directly. The build intentionally lets you **feel the pros/cons**—latency, power, privacy, and complexity—of Edge-AI vs Cloud-AI within one project. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Operations & Power**
The camera module targets **battery-powered, long-duration operation** leveraging Spresense’s low-power profile. During evaluation, the LCD is kept on for status/preview. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

---

### Why It Matters (for WIZnet Makers)

**Concrete W5500 integration lessons**
Choosing **wired Ethernet** over Wi-Fi surfaces **real SPI/CS routing constraints** on Spresense. The SPI4→SPI5 rerouting, CS reassignment, and RJ45 clearance notes are hard-won tips that elevate reproducibility for Ethernet-based builds. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Architecture thinking: Edge-AI vs Cloud-AI**
Within a single project you can compare security, latency, development effort, and power across edge and cloud recognition—insightful for PoCs and productization paths. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Operational valuePeriodic monitoring + automatic notification** makes usage tracking trivial and helps catch anomalies (e.g., leaks) earlier—backed by the author’s own experience note. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Maintenance hints**
Practical notes on the **W5500-Ether library update** and **Google CA trust anchors** help teams keep the stack secure and maintainable over time. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

---

### Quick Reproduce (Checklist)

**Hardware**
Spresense main + extension board, HDR camera, **W5500-Ether**, ILI9341 TFT, hand-made LCD sub-board. Plan SPI/CS wiring with the **SPI5 + custom CS** fallback in mind. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Toolchain**
VS Code + PlatformIO (with uploader settings). Install **Adafruit-GFX**, **Adafruit_ILI9341**, **SSLClient**; place **W5500 sources under **`**\w5500_src\**`. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Cloud Path**
Enable Google Drive API & GAS (OAuth client, refresh token, folder ID). Implement upload → OCR → notify, and include **Google trust anchors** for SSL. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Edge Path**
Run OCR on-device, then compare latency, power, and robustness versus the Cloud path. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Ops**
Design for low-power, battery operation; tune capture cadence, notification policy, and storage strategy to your site conditions. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

---

### References

**Original (Japanese)**: elchika — *HDRカメラでメーターからAI自動検針* (by **akino**, Jan 26, 2025). Project scope, parts list, wiring, and both cloud/edge pipelines are documented with photos and step-by-step notes. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**W5500-Ether (Crane Electronics)** — Add-on board referenced in the build. ([elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/))

**Spresense + PlatformIO** — Dev-environment and uploader setup references cited by the author.

## [UCC 큐레이션] HDR 카메라로 미터 값 AI 자동검침(Spresense + W5500)

**(Curated from elchika, Japanese / Author: akino)**

### Overview

본 프로젝트는 **Sony Spresense + HDR 카메라**로 유·가스·전력 등 **숫자 표시 미터**를 촬영하고, **AI 문자 인식**으로 현재 값을 판독해 **메일/클라우드로 통지**하는 제작기입니다. 네트워크는 원래 Wi-Fi 애드온을 고려했으나 최종적으로 **유선 이더넷 애드온(W5500-Ether)**로 구성했으며, **Edge-AI(기기 내 인식)**와 **Cloud-AI(Google Drive + Google Apps Script)**의 **두 경로를 비교**하여 장단점을 체험합니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

---

### Original Language & Author

원문은 **일본어(Japanese)**로, **2025-01-26**에 elchika에 게시되었습니다. 저자 **akino**는 Spresense/HDR 카메라/네트워크 모듈을 조합해 **배터리 구동의 장기 연속 운용**을 목표로 하였고, 일본 로컬 유통사·부품 정보와 세부 결선 노트를 풍부하게 제공합니다. 이 큐레이션은 글로벌 독자가 언어 장벽 없이 **동일한 재현성**을 얻도록 핵심 절차와 시행착오 포인트를 영문으로 전달하기 위한 것입니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

---

### Key Highlights

**문제 정의 & 동기**
야외에 있는 미터를 사람이 직접 보러 가는 번거로움을 줄이고, **정기 촬영 → OCR → 통지**로 **일일 사용량을 자동 확인**합니다. 누수/과금 이슈의 조기 발견 같은 실용성도 강조합니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**하드웨어 구성(Spresense + HDR 카메라 + W5500-Ether)**
Spresense 메인/확장 보드, HDR 카메라, **유선 네트워크 확장 보드(W5500-Ether, Crane Electronics)**, ILI9341 TFT-LCD, 자작 LCD 서브보드를 사용합니다. 카메라 고정, 초점 재조정(거리 약 10cm), 화각 약 39° 등 실제 설치 팁이 포함되어 있습니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**배선/버스 이슈와 우회(현장감 있는 노하우)**
당초 **SPI4(확장보드 측)**로 W5500을 붙이려 했으나 문제가 있어, **메인보드의 SPI5로 점퍼링**해 사용했습니다. CS 신호도 기본 핀이 아닌 다른 핀(JP2-#6 등)으로 재지정하는 등, **기판 간 간섭(RJ45 간섭)**과 **핀 배치** 문제를 현실적으로 다룹니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**소프트웨어/툴체인VS Code + PlatformIO(Windows10)**로 개발. 업로더 설정·Spresense 대응은 참고 문서를 인용했고, **Adafruit-GFX/ILI9341**, **SSLClient@^1.6.11**를 사용합니다. W5500 라이브러리는 프로젝트 폴더 내 `\w5500_src\`에 배치. **W5500-Ether 라이브러리 최신 업데이트(1/23 확인)** 언급과 라이브러리 매니저 배포 소식 등 유지보수 정보도 포함합니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**두 가지 인식 경로(Edge vs Cloud) 비교 설계Cloud 경로**: 촬영 이미지를 **Google Drive API**로 업로드 → **GAS**로 OCR → 결과 통지. OAuth 클라이언트/리프레시 토큰 발급, 폴더 ID 취득, **SSLClient + Google 인증서(trust anchors)** 구성까지 세부 절차가 정리되어 있습니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**Edge 경로**: **Spresense 기기 내 AI**로 OCR 수행 후 통지. 두 방식의 **장단점 체험**을 기획 의도로 명시합니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**전원/운용 컨셉**
Spresense의 **저전력 특성**을 살려 **배터리 구동 장기 연속 운용**을 목표로 설계했습니다. LCD는 검토 단계에서 상태 확인용으로 상시 표시를 사용합니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

---

### Why It Matters (WIZnet Maker 관점)

**W5500 실전 인터페이싱 사례**: Wi-Fi 대신 **W5500 유선 이더넷**을 선택했기에, **SPI 버스 충돌/레이아웃 제약**을 해결하는 실제 노하우(CS 재배치, SPI4→SPI5 전환)가 담겨 있습니다. 이 부분은 **WIZnet 기반 설계의 현장성**을 높여 줍니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**Edge-AI vs Cloud-AI 아키텍처 비교**: **장치 내부 처리 vs 클라우드 처리**의 보안/지연/개발 난이도/전력 관점 비교를 한 프로젝트 안에서 실험해볼 수 있어, 향후 제품화·PoC에서도 참고도가 높습니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**운영 가치**: **정기 모니터링 + 자동 통지**로 사용량 추적과 이상 감지를 단순화—누수/과금 이슈 예방에 직접적입니다. (저자의 실제 경험 근거) [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**유지보수 힌트**: W5500-Ether 라이브러리 **업데이트 및 배포 경로**를 모니터링하고, SSL 통신부의 **신뢰 루트 구성**(Google CA)까지 포함해 현업 개발에 필요한 유지보수 정보를 제공합니다. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

---

### Quick Reproduce (Checklist)

**하드웨어**: Spresense 메인/확장 보드, HDR 카메라, W5500-Ether, ILI9341 TFT, 자작 LCD 서브보드 준비 → **SPI/CS 배선 재지정** 고려. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**툴체인**: VS Code + PlatformIO 구성(업로더 설정 포함). **Adafruit-GFX/ILI9341**, **SSLClient** 설치. `\w5500_src\` 준비. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**Cloud 경로**: Drive API·GAS 설정(OAuth, 리프레시 토큰, 폴더 ID) → 촬영/업로드/OCR → 통지. **Google 신뢰 루트** 포함. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**Edge 경로**: Spresense 내 AI OCR 파이프라인 구성 → 성능/전력/지연 비교. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**운용**: 저전력/배터리 연속 구동 가정 → 촬영 주기, 통지 정책, 저장 전략을 조정. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

---

### References

**Original (Japanese)**: elchika — **HDRカメラでメーターからAI自動検針** (by **akino**, 2025-01-26) — 목차·구성·부품·배선·소프트웨어/클라우드 절차 상세. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**W5500-Ether (Crane Electronics)** — 제품 페이지(부품 리스트 인용). [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

**Spresense Docs & PlatformIO 가이드** — 개발환경/업로더 설정 참고 링크. [elchika](https://elchika.com/article/16635721-4b63-43e5-a090-cbfb16d96b3e/)

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Source: https://maker.wiznet.io/matthew/projects/hdrai/