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 —…
Sensirion’s SHT-series sensors are considered the gold standard in temperature and humidity sensing.They are used in industrial HVAC, medical devices, consumer electronics, environmental monitoring, and high-accuracy IoT projects. This article compares all SHT sensors, highlighting accuracy, stability, power consumption, differences,…
Bosch Sensortec is the leader in environmental sensing for IoT, and their BMP/BME sensors are used everywhere—from drones and weather stations to air-quality monitors and smart-home automation.Although many modules look identical, each generation offers different capabilities, accuracy improvements, and target…
There are now many ESP32 versions, but choosing one is easier than the model numbers make it look. For most projects, buy an ESP32-S3 development board with PSRAM. For more specialised projects: Espressif’s current product range now includes the original…
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…