# Smart Cooling System

Day 45 of the 100 Days 100 IoT Projects collection. Board: ESP8266.

An ESP8266 spins up a fan automatically when the DHT11 reports heat. Closed-loop temperature control.

## How it works

The ESP8266 reads temperature from the DHT11 on a schedule and compares it to a setpoint. Above the setpoint it energizes the relay and the fan spins; below it, everything rests. A textbook closed control loop: sense, decide, actuate, repeat.

## What you'll learn

- Closed-loop control
- Temperature setpoints
- Relay-driven appliances
- Hysteresis in control loops

Full project (code, wiring diagram, Wokwi simulation): https://github.com/kritishmohapatra/100_Days_100_IoT_Projects/tree/main/Smart_Cooling_System_using_ESP8266_DHT11_&_Relay

Summary by SkillShop. Code and diagrams belong to the original repo.