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# Hot Tub PH Monitoring System
- URL: https://undiluted.org/hot-tub-ph-sensor-system/
- Published: 2019-12-22T20:23:43.000Z
- Updated: 2026-09-09T21:32:02.000Z
- Author: nic
- Tags: C, javascript, node.js, React, Raspberry Pi, #Import 2026-09-02 19:24

This blog post, will describe the process of building out a Hot Tub PH monitoring system.

There will be four sections:

- [Raspberry Pi PH Circuit](https://undiluted.org/raspberry-pi-ph-circuit/)
- [Storing PH Data into PostgreSQL](https://undiluted.org/c-software-to-store-ph-data/) (PHreader)
- [Node.js+ExpressJS REST API to obtain PH data from PostgreSQL](https://undiluted.org/node-js-rest-ph-data-api/) (PHrest)
- [React Frontend for display of PH Data to end users](https://undiluted.org/react-ph-data-frontend/) (PHreader-UI)