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Affichage des articles du 2017

New major version of OpenMQTTGateway V0.3

I'm pleased to announce OpenMQTTGateway V0.3 release with the following content:

Add BLE beacons detection thanks to HM10 keyes moduleThis is a major add, you can now detect BLE beacons that are into the gateway perimeter for presence detection, the gateway publish the beacon adress and the signal strength Add the possibility to pass raw data to and from mqtt from and to IRNow you can pass raw IR signal and receive also them
Add RF and IR repeater functionThis function enable to increase the range of your devices by repeating the received signals with the gateway.
Add the ability to handle RF codes with different bit length than 24Add the possibility to filter unknown protocols for IRAdd the possibility to take into account Sony IR protocol special parametersCorrect DHT wrong pin assignementAdd an option to don't resend dht temperature and humidity when there is no value changeChange to GPL V3 license to prepare future libraries addThe new version is available on the github

Ina226 voltage and current sensor with esp8266 sending by MQTT

I needed to measure the voltage and the current of my lawn mower robot, as i have already an home automation system, the point was also to integrate these measures into Openhab and idealy using mqtt protocol. The first idea that came up was to use a voltage divider to measure the voltage with the esp8266 analog pin.Nevertheless i found some contradictives infos about this, the accepted voltage was low between 1v and 2v depending on the sources. Unfortunately my battery is a 28,4v one.
With some search I found on banggood the ina226 sensor already soldered and ready to plug with an arduino. The question was; is this compatible with an esp8266 to allow an easy integration with my home automation system.
The answer is yes.

Thanks to the help of Shelvin blog here are the details:

Pinout for a NODEMCU: Nodemcu/INA226 D1/SCL D2/SDA GND/GND 5V/VCC
IN+ & IN- correspond to the current meter for the tests, I linked them before the INA226 power so as to have some current measurements. VBS is for volta…

Feedback about room temperature sensor with standalone ATMEGA328P and DHT22

After some months of low cost low power room sensor usage here is the feedback.

The sensor send every hour to OpenHAB with the OpenMQTTGateway temperature, voltage and humidity data, it is powered by 3 AA alkaline batteries.

But the most interesting thing about this sensor is how the battery voltage decrease so as to have an idea on the batteries lifetime.

Here is below voltage (mV) graph on the last day, month and 4 months sent by the sensor (the charts are updated every day):

4 months

We can see that on a 4 months duration the battery decreased around 0,1V. If we consider an end of life at 3V for our 3 AA batteries this give us a lifetime of  4,5V - 3V = 1,5V 15 * 4 months = 60months = 5 years of expected duration (without taking into account the AA auto discharge)
5 years of expected duration with a less than 8€ sensor !

Major version of 433toMQTTto433 gateway --> OpenMQTTGateway

A new version of the gateway is available on github:

This version introduce the following changes:

esp8266 and arduino compatibility with the same codecode SRAM load optimization for arduino unogroup user and other parametersremove duplicate for IRRF protocols definition in subjectRF pulse length definition in subjectacknowledgement inside a subtopiccode refactoringhandle MQTT authentication automaticaly if user setput parameters on an user_config.h file

Major change is the arduino and esp8266 compatibility with the same code, the goal is to be able to maintain the gateway for both platform on a more easy way.

You will notice also that the code has been optimized and the sram footprint also.

It is now possible to define into the topic some rcswitch parameters like protocol and pulselength.

I add some requests about adding direct modules like DHT sensor or fan on the gateway but wouldn't like to drift the code from what it is first ... a gat…

Making your RF 433mhz sensors and devices communicate with your home automation, gateways comparison

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:
Infrared5,8ghz2,4ghz867mhz433mhzwire...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 in european countries 433mhz devices/sensors are quite easy to find and with a correct price.
We will take the following citerias: PriceDIY complexityNumber of protocols taken into accountComplexity of home automation integrationAnd 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)