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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  take a look at it you will find up to d

In this article I’m going to detail how to integrate the  OpenMQTTGateway  with OpenHAB using MQTT protocol. We will explore two kind of integration : -a cheap socket wall switch (on/off) -a voltage sensor ( values between 0 to 5000mV) based on this tutorial Before continuing you must have : ·          An MQTT broker running (for example mosquitto) ·          An OpenHAB instance running with the MQTT addon binding configured to talk to your MQTT broker ·          The 433mhz Gateway setup (either arduino or esp8266 one) Cheap wall socket The wall socket that we will be using are these ones Be carefull not all the wall sockets are compatible with RCSwitch (Library used by the 433Mhz Gateway). For example blyss ones are not compatible. Learning the codes of your plug First step will be to learn the code that are used by the plug. So as to that open your command line and subscribe to the following subject : home/433toMQTT Press the ON button of the rem

The goal  is to act as a gateway between 433Mhz sensors and a MQTT broker or between the MQTT broker and 433Mhz actuators, 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  It can be an interesting part in an home automation system so as to interface sensors and actuators (wall sockets) with software like openhab . List of compatible sensors here The interest of putting this gateway to an ESP8266 and not on a raspberry pi is to be able to manage security actions at gateway level (power on a siren, cut power to certain devices) following RF data received by sensors without being dependent to the PI for security related actions. [EDIT] all infos are now centralized into  the github repository  take a look at it you will find up to date info about OpenMQTTGateway You need: Software: Mosquitto Arduino IDE latest version (tested ok with 1.6.10

I needed to have a way to know the state of my garage door.  Several solutions where at my disposal so as to do that; hack the existing control central to be able to know the position of the door and send the status wireless to my 433Mhz to MQTT gateway add an external sensor  and send the status wireless to my  433Mhz to MQTT gateway One of these two options with a cable After some investigations on the control central of my garage door I have deducted that there is no "closed" "open" contact, indeed the stop of the motor seems to be detected by the fact that it is "forcing" maybe by detecting some over current. The sensor that I have at the bottom of this garage door is in case there is an obstacle in the course of the door. Sending a stop to the motor. Unfortunately I can't use this due to the fact it is not actionned at the end of the course. Safety sensor of the garage door (cannot be hacked for state recognition) I had to

I have built an external sensor so as to monitor temperature, air humidity, soil humidity of my garden and the battery voltage. The requirements was: waterproof long battery life, the atmega328p run at 8mhz with minimal components and functions under 10€ wireless (433Mhz) with good range (2 walls to cross and 10 meters) Here is the final view: And some reports from OpenHab displaying the sensor data: Air humidity Soil humidity Air temperature We can of course imagine to use these values to control a water pump. Now let's see hpw to build this. Bill of material The sensors is based on atmega328p (3€),  a 433 Mhz transmitter (1,5€) , a DHT11 (1€) or a DHT22 temperature and humidity sensor, a soil moisture sensor  (1,6€), an electrical box (1€)  a 433 mhz antenna (0,18€) DIP socket adaptor for the ATmega (1€) an electronic prototype printed circuit board (0,5€) a recycled  tube At total we are around 10€ Principle Every ho