1 Technophile

After more than one year of usage of home automation (HA) I have seen that one critical point is the communication between the sensors/devices and the HA system.  There is several possibilities for that: Infrared 5,8ghz 2,4ghz 867mhz 433mhz wire ... And for each of these possibility we can have a huge amount of different protocols. The goal of this article is to draft a list of the 433mhz gateways that can be found. We will focus on 433mhz due to the fact that i n european countries 433mhz devices/sensors are quite easy to find and with a correct price. We will take the following citerias: Price DIY complexity Number of protocols taken into account Complexity of home automation integration And take a look at RFXCom, RFLink, 433toMQTTto433 ESP8266, 433Utils, Broadlink RM... I will put in green the keypoints of each gateway. E&R = 433mhz emitter and receiver, can be a FS1000A and a XD-RF-5V or a superheterodyne one (recommended)

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...