An ESP32 + CT current clamp + ESPHome can monitor AC current without electrically connecting the ESP32 to mains voltage. ESPHome’s native ct_clamp component samples the CT waveform, calculates RMS current and exposes it directly to Home Assistant. For a…
A standard 4-wire PWM PC fan can be controlled from an ESP32 while its real rotational speed is returned to Home Assistant as RPM. The fan keeps its normal 12 V supply continuously connected, while the ESP32 generates the standard…
Turn a basic pulse-output water meter into a fully local Home Assistant sensor using an ESP32 and ESPHome. This guide shows wiring, pulse_meter setup, live flow rate, total consumption, Energy dashboard integration, daily and monthly usage tracking, and simple leak-detection…
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,…
If you’re reading esp32.co.uk, you probably already have Home Assistant stuffed with ESPHome sensors, smart relays, and automations that look like a small PhD thesis. But none of that matters if turning a light on takes 10–15 seconds of app-fumbling.…