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From measurement point to traceable evidence

Open HACCP

Open HACCP connects a mobile operations dashboard with a secure sensor protocol and an ESP32-S3/SHT45 reference implementation for temperature and humidity readings.

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Staged editorial visualisation of an ESP32 sensor unit, development board and mobile monitoring dashboard
What this is about

Open HACCP is a publicly inspectable PoW24 prototype for supporting operational HACCP processes digitally. It combines device onboarding, secure measurement ingestion, role-based operation, analysis, deviations and background exports in a mobile web application.

The reference firmware uses an ESP32-S3 and SHT45, buffers readings locally and follows a bounded wake–measure–persist–transmit–sleep cycle. Sensor Protocol V1 defines encrypted transport, unique sequences, partial acknowledgements, idempotent retries and safe adoption of updated measurement and upload intervals.

The source code documents the technical state transparently. Production-ready hardware still requires real current and battery measurements, calibration, offline-capacity sizing and the relevant specialist, legal and instrument evidence.

Technical evidence

Open source instead of a bare claim.

The public PKWS100/Open-HACCP repository documents the backend, web interface, data model, sensor contract, ESP32 reference firmware and automated tests.

01

Mobile web interface

Dashboard, analytics, roles, deviations and exportable operational evidence.

02

Sensor Protocol V1

Authenticated HTTPS transport, unique sequences, partial acknowledgements and safe configuration adoption.

03

ESP32 reference firmware

ESP32-S3 and SHT45 with local buffering and a wake–measure–persist–transmit–sleep cycle.

04

Transparent boundary

Technical prototype and operational evidence support – not legal, HACCP or instrument certification.

Inspect Open HACCP on GitHub

The hero images are labelled editorial visualisations, not documentary photographs of a production-ready or certified measuring instrument. Battery life and hardware suitability are validated for the specific implementation.

At a glance

Problem, solution, technology and current status.

The key technical and operational facts about this solution.

01

Problem

Open HACCP connects a mobile operations dashboard with a secure sensor protocol and an ESP32-S3/SHT45 reference implementation for temperature and humidity readings.

02

Solution

Open HACCP is a publicly inspectable PoW24 prototype for supporting operational HACCP processes digitally. It combines device onboarding, secure measurement ingestion, role-based operation, analysis, deviations and background exports in a mobile web application.

03

Technologies

  • PHP 8.3 / Slim 4
  • MariaDB 10.11 / PDO
  • ESP32-S3 / SHT45 / PlatformIO
  • Sensor Protocol V1 / HTTPS / HMAC-SHA-256
  • Docker Compose / PHPUnit
04

Outcome & status

Public development project; hardware and legal approvals required before production

01

do not reinterpret historic readings

We make assumptions and decisions visible.

02

document deviations through revisions

We choose technology for the actual context.

03

keep legal and production status transparent

We treat handover and operation as part of the solution.

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