This project turns an ESP32 into a simple learning IR remote. An IR receiver captures a button press from a TV, amplifier, fan or other infrared remote, the ESP32 identifies the protocol, address and command, stores the code in memory,…
The Ai-Thinker RD-03D is a 24 GHz FMCW mmWave radar designed for multi-target trajectory tracking. Connected to an ESP32, ESPHome can report up to three targets simultaneously, including each target’s X/Y position, distance, speed and angle, then expose everything directly…
The HLK-LD2420 is a 24 GHz mmWave presence sensor that works very well with an ESP32 and Home Assistant through ESPHome. Unlike a PIR sensor, it can maintain presence from both movement and smaller stationary-body movements. ESPHome provides native LD2420…
For most new ESP32 and Home Assistant projects, the SCD41 is the best overall CO₂ sensor because it combines a tiny package with better accuracy than the SCD40, a specified range up to 5,000 ppm, and low-power single-shot measurement. The…
For most new ESP32 and Home Assistant projects, the SHT40 is the best value: it is newer, smaller, faster, and consumes less power than the SHT31 while offering slightly better humidity accuracy. Choose the SHT45 when measurement accuracy matters most…
For most Home Assistant rooms, the LD2410 is still the best all-round mmWave presence sensor because it is inexpensive, mature, highly configurable and particularly good at detecting a person who is sitting or barely moving. Choose the LD2450 when you…
This guide shows how to build a safe ESP32 smart relay (Shelly-style) for Home Assistant using ESPHome (optional MQTT). Includes correct wiring (low-voltage vs mains), relay module selection, GPIO “safe pins”, EMI/noise tips, and example ESPHome YAML for a reliable…
This guide shows how to connect a PMS5003 (PM2.5/PM10) particulate sensor to an ESP32 using UART, configure it in ESPHome, and display air-quality values in Home Assistant (optional MQTT). Includes wiring, safe GPIO choices, recommended update intervals, warm-up/duty cycling tips,…
Quick SummaryThis guide shows how to connect an INA219 or INA226 current/voltage sensor to an ESP32 over I²C, configure it in ESPHome, and monitor battery/solar voltage, current, power and energy in Home Assistant (optional MQTT). Includes wiring, address scanning, calibration…
This guide shows how to wire a DHT22/AM2302 to an ESP32, set it up in ESPHome, and get temperature + humidity into Home Assistant (with optional MQTT). It includes the correct pull-up resistor, safe GPIO choices, recommended update intervals, and…