ESP32 Multi-Zone Heating Controller with ESPHome and Home Assistant
Build an ESP32 multi-zone heating controller with ESPHome and Home Assistant. Control room thermostats, zone valves and shared boiler demand safely.
PZEM-016 with ESP32 and ESPHome: RS485 AC Energy Monitoring
Quick summary: The PZEM-016 measures single-phase AC voltage, current, active power, frequency, power factor and accumulated energy. Its external current transformer (CT) goes around one conductor; its mains measurement terminals sense the circuit voltage; and its RS485 port sends the…
SEN55 with ESP32 and ESPHome: PM2.5, VOC, NOx and Home Assistant
MH-Z19B with ESP32 and ESPHome: UART CO₂ Monitoring and Calibration
Connect an MH-Z19B CO2 sensor to ESP32 and ESPHome via 9600-baud UART. Covers safe 5 V wiring, warm-up, automatic baseline calibration, manual zero calibration, Home Assistant ventilation and troubleshooting.
SCD40 vs SCD41 with ESP32 and ESPHome: Real CO₂ Monitoring for Home Assistant
Tipping-Bucket Rain Gauge with ESP32, ESPHome and Home Assistant
Build an ESP32 tipping-bucket rain gauge with ESPHome and Home Assistant: reed-switch wiring, debouncing, millimetres-per-tip calibration, daily rainfall, rain rate and reboot-safe totals.
TCA9548A I2C Multiplexer with ESP32: Multiple Sensors at the Same Address
ESPHome OTA Update Failed: Safe Mode, Recovery and USB Reflashing
Fix ESPHome OTA update failures: IP and port troubleshooting, 2026.9 encrypted OTA migration, boot loops, Safe Mode, rollback, partition errors and ESP32 USB reflashing.
M5Stack AtomS3 Lite: Pinout, Arduino Setup and ESPHome Projects
M5Stack AtomS3 Lite pinout and setup guide covering GPIOs, RGB LED, button, IR transmitter, Grove port, Arduino IDE, ESPHome, upload recovery and practical Home Assistant projects.
AHT20 with ESP32 and ESPHome: Wiring, Calibration and Home Assistant
Connect an AHT20 temperature and humidity sensor to ESP32 and ESPHome. Covers 0x38 wiring, AHT20 variant setup, calibration offsets, filtering, self-heating, placement, condensation and Home Assistant.