IoT MQTT PID Temperature Controller

ESP8266-based PID temperature controller with MQTT connectivity for smart heating and cooling applications.

Overview

This project implements a PID (Proportional-Integral-Derivative) temperature controller on ESP8266 with MQTT integration for IoT automation.

Features

• PID Control — Precise temperature regulation
• MQTT Connectivity — Integration with Home Assistant and other IoT platforms
• Configurable Parameters — Tunable PID constants
• Temperature Sensing — Support for common sensor modules
• Output Control — Relay or PWM output for heating/cooling

Hardware

• ESP8266 microcontroller
• Temperature sensor input (DS18B20, thermistor, etc.)
• Relay or PWM output for heater/cooler control
• Status LEDs

Firmware

The firmware includes:

• PID algorithm implementation
• MQTT client with auto-reconnect
• Configuration via MQTT or serial
• Temperature calibration
• Safety limits and fault detection

Applications

• Home brewing temperature control
• 3D printer heated bed optimization
• Aquarium temperature regulation
• Greenhouse climate control
• Sous vide cooking
• Incubator temperature management

Configuration

PID parameters, setpoints, and safety limits can be configured via:

• MQTT commands
• Serial console
• Stored configuration (EEPROM)

Documentation

Full firmware source, hardware design files, and configuration examples included.

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Firmware, hardware design, and documentation available in the project repository.