A simple ESP32 + relay module can turn almost any boiler or electric water heater into a smart, automated device controlled by Home Assistant.With the right wiring and automations you can: This guide covers both ESPHome and MQTT (Arduino) approaches…
ESP-NOW is a proprietary low-power, low-latency wireless protocol by Espressif that allows ESP32 boards to talk directly to each other without creating full Wi-Fi connections. It’s ideal for building a fast sensor network that reports into Home Assistant through a…
A “smart” bathroom fan should: Below is a complete Home Assistant implementation that uses: The logic is split into three parts: 1. Prerequisites: Entities Used Assumed entities: If the fan is a switch, just replace fan.bathroom_fan with switch.bathroom_fan in the…
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:…
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,…
The Sensirion SGP40 is one of the easiest ways to add VOC monitoring to Home Assistant with an ESP32 and ESPHome. It connects over I²C and ESPHome handles the important part automatically: converting the sensor’s raw signal into Sensirion’s VOC…
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 —…
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…