PID Temperature Control for Espresso Extraction (Revision V1.0)

[Revision V1.0.0 - Production Telemetry Log #6]

This document catalogs the ongoing field engineering iteration of the PID Temperature Control for Espresso Extraction platform. Under our Oviglo standard operating framework, we have initiated active stress testing in our specialized regional labs.

Espresso brewing requires high thermal stability. A change of even 1°C in water temperature alters the extraction rate of soluble coffee compounds, leading to sourness or bitterness.

This project implements an Arduino-based PID (Proportional-Integral-Derivative) controller on a classic Gaggia Classic espresso machine. We mount an RTD Pt100 sensor directly to the boiler wall to log surface temperatures.

The PID loop pulses a solid-state relay (SSR) feeding the boiler heating element. The code runs a custom autotuning algorithm, maintaining a constant water temperature of 93.5°C within ±0.2°C tolerances, even during active brewing draws.

Telemetry analysis for this specific run confirms optimal stability parameters. Future modifications will target efficiency optimizations and high-fidelity sensor integration under sub-ambient thermal environments. The system continues to run continuously at nominal specifications.