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Thomas Callen

Software Developer

Spring Lake, Michigan, USA

tcallen1001@gmail.com

Tel. +1 (616) 558-8366

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© 2026 Thomas Callen. All rights reserved.

2024

Open-Source Smart Water Purifier / Analyzer (GLBL Foundation)

Internet of Things (IoT), Embedded Systems, Cloud Databases, Web Development, Backend Development, API Design

Open-Source Smart Water Purifier / Analyzer (GLBL Foundation)

Description:

Multipart project for GLBL Foundation: assembled Raspberry Pi Pico–based sensor nodes integrating turbidity, total dissolved solids (TDS), and temperature sensors. Devices published telemetry to Azure IoT Hub, where a custom ASP.NET Core backend ingested, validated, and stored data in Microsoft SQL Server using EF Core. The backend also exposed a REST API for querying device telemetry and supporting downstream analytics. In parallel, contributed to a Next.js/React website to communicate the foundation’s mission and provide groundwork for future data visualization of real-time water quality readings.

Languages:

  • MicroPython

  • TypeScript

  • SQL

  • C#

Frameworks:

  • Next.js

  • React

  • ASP.NET Core

Libraries:

  • azure-iot-device

  • pyodbc

  • EF Core

Platforms:

  • Azure IoT Hub

  • Microsoft SQL Server

Multipart project for GLBL Foundation: assembled Raspberry Pi Pico–based sensor nodes integrating turbidity, total dissolved solids (TDS), and temperature sensors. Devices published telemetry to Azure IoT Hub, where a custom ASP.NET Core backend ingested, validated, and stored data in Microsoft SQL Server using EF Core. The backend also exposed a REST API for querying device telemetry and supporting downstream analytics. In parallel, contributed to a Next.js/React website to communicate the foundation’s mission and provide groundwork for future data visualization of real-time water quality readings.

Languages:

  • MicroPython

  • TypeScript

  • SQL

  • C#

Frameworks:

  • Next.js

  • React

  • ASP.NET Core

Libraries:

  • azure-iot-device

  • pyodbc

  • EF Core

Platforms:

  • Azure IoT Hub

  • Microsoft SQL Server

README.md

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