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…
If you’re reading esp32.co.uk, you probably already have Home Assistant packed with ESPHome sensors, smart relays, and automations that look like a small engineering project. But let’s be totally candid: a smart home is useless if it takes 15 seconds…
KNX is a standardized, wired building automation protocol. Unlike consumer smart home gadgets (which often rely on a central hub or WiFi), KNX is decentralized. Because it is an open standard used by over 500 manufacturers (like Siemens, ABB, MDT,…
If you followed our Bluetooth Proxy Guide, you probably have an ESP32 sitting behind a sofa or plugged into a wall, doing a great job listening for Bluetooth signals. But it’s wasted potential. That ESP32 is a powerful microcontroller running…
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…