A wall-mounted ESP32 room controller with a small display and a few buttons can replace several physical thermostats and remotes: This guide shows how to build an ESP32-based room controller with: 1. Hardware Required 2. Suggested Pinout Buttons are wired:…
Most ESP32 projects are powered from USB adapters and run 24 battery-powered sensors, that approach kills the battery in a few hours. To build long-lasting wireless sensors (temperature, humidity, leak, motion, etc.) running on 18650 cells or LiPo batteries, the…
An ESP32 can easily replace five separate smart sensors with a single multi-sensor node that sends everything to Home Assistant: All fully local, no cloud, and powered from a single USB supply. This guide shows how to build an all-in-one…
Water leak sensors can prevent serious damage from leaking pipes, washing machines, dishwashers, boilers, and under-sink plumbing.With an ESP32 and a simple water leak probe, it is easy to build a low-cost, fast, and fully local leak detection system that…
A motion sensor that only turns lights on when it’s dark is one of the most useful smart home automations.By combining a PIR motion sensor with a simple LDR (light-dependent resistor) and an ESP32, it’s easy to build a local,…
Indoor air quality is not just about CO₂. Volatile organic compounds (VOCs) from cleaning products, furniture, paints, cooking, and people can significantly affect comfort and health. The SGP40 is a modern VOC sensor designed specifically for indoor air quality applications,…
Combining a PIR motion sensor with an LDR light sensor is one of the most flexible ways to create intelligent room automation.With this setup, lights can automatically turn on only when the room is dark and motion is detected —…
Indoor air quality (IAQ) is influenced not only by CO₂ and humidity, but also by volatile organic compounds (VOCs) such as cooking fumes, cleaning chemicals, paints, perfumes, and off-gassing from furniture.The SGP40 is a high-quality VOC sensor from Sensirion that…
Controlling a DC fan using PWM (Pulse Width Modulation) is an easy and cost-effective way to cool network cabinets, 3D printer enclosures, AV racks, routers, amplifiers, or any electronics that require temperature-activated airflow. This guide explains how to use an…
A reed switch is one of the simplest and most reliable ways to detect when a door or window opens. When combined with an ESP32, it becomes a fast, local, battery-free, and cloud-free door sensor that integrates perfectly with Home…