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Following my first build of an external garden sensor, here is a simplified version with temperature, humidity and battery voltage measurement for a baby bedroom [EDIT] feedback about the expected battery duration here The requirements are: cheap long battery life, the atmega328p run at 8mhz with minimal components and functions under 8€ wireless (433Mhz) with good range (2 walls to cross and 10 meters) Here is the final view attached to a lion for decoration: And a report from OpenHab displaying the sensor data: If you want more details about energy power consumption the first article on this subject is more detailled. Now let's see how to build this. Bill of material The sensors is based on atmega328p (3€),  a 433 Mhz transmitter (1,5€) , a DHT22 temperature and humidity sensor (4€), a 433 mhz antenna (0,18€) DIP socket adaptor for the ATmega (1€) an electronic prototype printed circuit board (0,5€) At total we...

Following discussions on the home assistant forum people gave me the idea to add Infrared communication to the 433mhz gateway.  The goal is to act as a gateway between 433Mhz sensors, infrared remote controls and a MQTT broker or between the MQTT broker and 433Mhz actuators, infrared devices, It enables to: receive MQTT data from a topic and send RF 433Mhz signal corresponding to the received MQTT data  publish MQTT data to a different topic related to received 433Mhz signal  receive MQTT data from a topic and send infrared signal corresponding to the received MQTT data  publish MQTT data to a different topic related to received infrared signal  It can be an interesting part in an home automation system so as to interface sensors and actuators (wall sockets), your tv, home cinema, hifi ... with software like  openhab  or home assistant . List of compatible RF sensors here [EDIT] all infos are now centralized into the github repository  ...