Sensirion SHT Sensors Compared: SHT20 to SHT45 (2026)
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Full Comparison of All Bosch BMP & BME Sensors (BMP085 → BME688,BME280) 2026
Bosch Sensortec is the leader in environmental sensing for IoT, and their BMP/BME sensors are used everywhere—from drones and weather stations to air-quality monitors and smart-home automation.Although many modules look identical, each generation offers different capabilities, accuracy improvements, and target…
ESP32 Versions Compared: Which Should You Buy?
Compare ESP32 versions in one chart, then choose the right chip or board for Wi-Fi, Bluetooth, Matter, Thread, Zigbee, USB, cameras and displays.
ESP32 PWM Fan Controller for Home Assistant (5–24V)
Controlling a DC fan using PWM (Pulse Width Modulation) is an easy and cost-effective way to cool network cabinets, 3D printer enclosures, AV racks, routers, amplifiers, or any electronics that require temperature-activated airflow. This guide explains how to use an…
ESP32 Reed Switch Door/Window Sensor for Home Assistant (ESPHome & MQTT) – Complete 2026 Guide
A reed switch is one of the simplest and most reliable ways to detect when a door or window opens. When combined with an ESP32, it becomes a fast, local, battery-free, and cloud-free door sensor that integrates perfectly with Home…
ESP32 CO₂ Monitoring with SCD30 & SCD41 (ESPHome & MQTT) – Complete 2026 Guide
Monitoring indoor CO₂ levels is one of the most effective ways to track air quality, improve ventilation, and maintain a healthy indoor environment.The SCD30 and SCD41 are two of the best consumer-grade CO₂ sensors, offering accurate measurements and excellent long-term…
ESP32 Bluetooth Proxy for Home Assistant: ESPHome Setup
Build an ESP32 Bluetooth proxy for Home Assistant with ESPHome. Includes YAML, recommended boards, placement, scanning modes, active connections and fixes.
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…