Quick Summary (TL;DR):You can monitor the real speed of a 3-wire or 4-wire DC fan with an ESP32 and ESPHome by reading the fan’s tachometer / RPM output. On standard PC-style fans, the tach wire is typically an open-collector output:…
Quick Summary (TL;DR):Combining a PIR motion sensor with a mmWave presence sensor such as the LD2410 gives Home Assistant a much better occupancy signal than either sensor alone. The PIR is excellent at detecting a person entering because it reacts…
Quick Summary (TL;DR):The HLK-LD2410 is one of the best low-cost mmWave sensors for Home Assistant because it can detect both moving people and very small/stationary human motion, but its default settings are intentionally broad and can create false presence from…
Quick Summary (TL;DR):You can build a proper Home Assistant voice assistant satellite with ESP32-S3 + ESPHome using an I²S microphone such as the INMP441 and an I²S amplifier such as the MAX98357A. The ESP32-S3 listens for an on-device wake word…
Quick Summary (TL;DR):The DS18B20 is one of the best sensors for measuring several temperatures with one ESP32 because every probe has a unique 64-bit 1-Wire address and multiple devices can share a single DATA GPIO. The hardware looks deceptively simple,…
Quick Summary (TL;DR):The HLK-LD2450 becomes much more useful in Home Assistant when you stop treating it as a simple presence sensor and start using its X/Y coordinates and three configurable rectangular zones. With current ESPHome, the LD2450 can expose up…
Quick Summary (TL;DR):The safest and most universal way to add an ESP32 garage door opener to Home Assistant is to imitate the existing wall pushbutton rather than trying to control the motor directly. Use a dry-contact relay connected across the…
Quick Summary (TL;DR):The SGP40 and SGP41 are Sensirion metal-oxide gas sensors designed for indoor-air-quality monitoring with ESP32, ESPHome and Home Assistant. The biggest difference is simple: SGP40 measures VOC behaviour only, while SGP41 adds a second sensing pixel for oxidizing…
Quick Summary (TL;DR):If the project is specifically about measuring temperature and relative humidity as accurately as possible, the SHT45 is the clear winner: Sensirion specifies approximately ±1.0% RH and ±0.1°C typical accuracy, very low long-term drift, a fast digital I²C…
Quick Summary (TL;DR):An ESP32 can turn an RS-485 Modbus energy meter into a completely local Home Assistant energy monitor. For single-phase circuits, an Eastron SDM120-M/Modbus-class meter is one of the easiest DIN-rail choices; for three-phase, solar, EV charging or more…