ESP32 Bluetooth Proxy: Home Assistant Setup
Set up an ESP32 Bluetooth proxy for Home Assistant with ESPHome. Includes recommended boards, YAML, placement, scanning modes and troubleshooting.
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ESP32 ↔ ESP8266 I2C Communication Between Two Boards – Simple Master/Slave Example
I²C is one of the easiest ways to send data between microcontrollers. ESP32 and ESP8266 both support hardware I²C, and you can connect them directly using just two wires: SDA and SCL and common GND. This guide shows a complete…
Full tutorial ESP-NOW Communication Between Two ESP32 Boards with struct_message
ESP-NOW is a fast, connectionless communication protocol developed by Espressif. It allows ESP32 boards to exchange small packets (up to 250 bytes) with extremely low latency and very little overhead — perfect for sensors, dashboards, wireless controllers, and battery-powered devices.…
ESP-NOW Communication Between ESP32 Master and ESP8266 Slave Using a Custom MAC Address
(Universal method — works with any ESP8266 board) ESP-NOW is one of the fastest and most reliable ways to send data wirelessly between ESP32/ESP8266 devices.Unlike Wi-Fi or MQTT, it requires no router, no pairing, and has almost zero latency (1–3…
ESP32 PIR Motion Sensor with Home Assistant (ESPHome & MQTT) – Complete 2026 Guide
Passive Infrared (PIR) motion sensors are one of the simplest and most effective ways to detect motion in a room. Combined with an ESP32, they provide extremely fast, local, cloud-free motion detection that integrates perfectly with Home Assistant. This guide…
ESP32 + DS18B20 with Home Assistant (ESPHome & MQTT) – Complete 2026 Guide
DS18B20 digital temperature probe lets you precisely measure temperatures in wet environments with a simple 1-Wire interface. The DS18B20 provides 9 to 12-bit (configurable) temperature readings over a 1-Wire interface, so that only one wire (and ground) needs to be…
ESP32 + SHT45 with Home Assistant (Wiring, ESPHome & MQTT) – Complete 2026 Guide
The SHT45 is currently one of the most accurate temperature and humidity sensors available.It offers laboratory-grade precision, ultra-low power consumption, and very stable measurements. This guide shows you how to connect an ESP32 + SHT45 to Home Assistant using two…
ESP32 PZEM-004T Energy Monitor (ESPHome & MQTT)
Real-time energy monitoring is one of the most valuable additions to a smart home. The PZEM-004T module provides accurate measurements of: When combined with an ESP32, it offers a powerful, inexpensive way to send energy data directly into Home Assistant.…
ESP32 Timer Interrupts – Complete Guide
ESP32 microcontrollers include multiple hardware timers that can trigger interrupts with microsecond precision. This makes them perfect for generating pulses, reading sensors, simulating RPM or speed signals, or scheduling tasks without blocking the loop(). In this article, we walk through…
How to Connect an ESP32 + BME280 Sensor to Home Assistant (via MQTT)
The BME280 is one of the easiest sensors to integrate into Home Assistant for live temperature, humidity, and pressure monitoring. In this guide, we show you how to install the sensor, flash the ESP32, configure MQTT, and view the readings…