Tasmota ist eine kostenfreie alternative Firmware für Geräte die auf dem ESP8266 Chip basieren, das sind solche von Sonoff und vielen weiteren Herstellern. Das Projekt startete offiziell im Januar 2017 von Theo Arends und wurde entwickelt um die Geräte einfach in sämtliche Smarthome Systeme einbinden zu können. Übrigens bedeutet Tasmota Theo-Arends-Sonoff-MQTT-OTA.

Tasmota befreit deine Geräte von undurchsichtiger Software um ihnen zu ermöglichen in Systemen zu funktionieren für die sie nie vorgesehen waren!

Obendrein erlaubt dir das deine Geräte unter einem Dach laufen zu haben und dein Smarthome und Zuhause zu vereinfachen.

My adjustable height desk [1] can now measure it's current height and announce it via MQTT thanks to a little NodeMCU script I whipped up and an HC-SR04 ultrasonic sensor connected to the ESP8266. Using mqttwarn [2] that data gets pushed into a Google Docs spreadsheet where I can then plot it easily.

ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
ESP8266 has powerful on-board processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area.

The ESP8266 is the answer to “I want something with Wifi.” Surprisingly, there are a number of engineers and hobbyists who have not heard of this chip or have heard of it but don’t really understand what it is. It’s basically the answer to everything IoT to so many engineering problems that have plagued the hobbyist and commercial world alike.