Back on the October 17, 2018 I backed a Kickstarter project by Libre Computer, named La Frite: Open Source Fries. Delivery was slated for November 2018, but there was a slight delay, and I received the package in the mail yesterday. Here are my first impresssions after I installed Debian Stretch on a headless system [...more]
The good news is that the newest version of the Official Linux Bluetooth protocol
stack BlueZ is included in Raspbian
Buster available since June 20, 2019.
However some tweaking still needs to be done to use Bluetooth on the Raspberry Pi
A major retailer sells Wi-Fi dimmers and other IoT devices that meet Canadian safety standards and that are certified by recognized agencies. Here's how I installed two of these devices and how it was possible to integrate them into the Domoticz home automation system. Voice commands (Google Home and Alexa) also work [...more (in French)]
About some problems with the May 5th stable version of Domoticz. There was no reason to adopt it so quickly and had I been less eager I would have avoided some difficulties. Nevertheless, all's well that ends well [...more]
It is about time that a watchdog be setup on the Raspberry Pi that is hosting my home automation system. This post describes a first effort which aims to implement the basics:
- Reboot if the hardware watchdog times out.
- Reboot if Domoticz hangs.
- Send an email notification when the system reboots.
Perhaps undeservedly, the Orange Pi Zero has the reputation of running
hot. I wanted to use the Domoticz data logging
facilities to record the core temperature of the single board computer
which is on all the time running
HA-Bridge. And while
setting that up, I decided that I should also log any errors occurring
during the execution of the script that updates the temperature data on a
regular basis and look into sending some sort of notification if the
Orange Pi Zero seems to be getting too hot
This note is about how to configure an
rsyslog server to
have it forward some or all of the log messages it receives to a remote
syslog server. A method to send an email in response to an
alert message is also discussed.
As I speculated, HA Bridge is very good as a proxy between Amazon Alexa and IoT devices defined in Domoticz. And installation was a snap [...more]
ir-keytableutility contains over 130 remote control definitions and can be used to craft one if the IR remote is not among that list [...more]
To quote lirc.org "Using lirc on Raspberry Pie [sic] is quite popular these days." Being a self-style contrarian I installed the package on the Orange Pi Zero. I managed to get simple demonstration programs working with it. [...more]
The note shows the basics about handling button presses from an infrared
remote control using the
python-evdev package and the
built in kernel support for IR events on an Orange Pi Zero. Neither
LIRC (Linux Infrared Remote Control) nor
ir-keytable is used
Lately, I'm using an Orange Pi Zero for new projects. This means burning the OS image on a microSD card and then performing a number of initial steps, setting up networks, upgrading all installed packages and so on, that need to be repeated in exactly the same way each time a new image is used. All this takes time. So I decided to create a custom binary image that avoids these steps [...more]
This is a second look at the Amazon Echo Dot 3rd generation with emphasis on using it with HA Bridge on an Orange Pi Zero for local control of IoT devices. This is not a detailed explanation but a reassurance that devices installed in the bridge will be discovered with the 3rd generation Echo Dot [...more]
This is a continuation of the previous note on Bluetooth on the November 2018 version of Raspbian Stretch in which the default version of BlueZ is replaced with version 5.49 and later version 5.50. There is not much difference between these three versions of Bluetooth protocol stack at least for audio streaming [...more]
This is a short note reporting some changes encountered with the newest version of BlueAlsa when used with BlueZ version 5.43 with the latest version of Raspbian Stretch [...more]
Lately, I have experimented a lot with the new version of Raspbian Stretch Lite, trying different configurations and
software. To check that everything works, I prefer to return to the
operating system as obtained from the Raspberry Foundation. Whenever the
image is copied to the SD card, the
/boot partition must be
changed in order to start the Raspberry Pi without a keyboard or monitor.
Then the operating system has to be upgraded. All this takes time. So I
decided to create a binary image that avoids these steps
[...more (in French)]
This post shows how to install version 1.4.35 of the Lighttp web server in Rasbian Stretch. It then becomes possible to route the video stream obtained from MJPG-Streamer as could be done in Jessie. The problem with version 1.4.45 of Lighttpd is also better identified though no solution is offered [...more]
The original post has been corrected. Some changes were minor but it was wrong to state that the latest version of Mosquitto could not be installed. It was a good opportunity to make clearer how to connect the real-time clock and temperature and humidity sensor without having to refer to older out of date posts. [...more]
How can I get on with software experiments and updates when new hardware keeps on arriving? In this second "mailbag" post without a video stream, I will present my first impressions of a cheap wireless IP camera, the 3-pole Itead Sonoff T1 wall switch, the new version of the Itead Sonoff Basic and the 3rd generation Amazon Echo Dot. [...more]
The post entitled All does not always work has been updated and translated into English. I added an item about the automatic update of the home automation IP address at FreeDNS. I also added an explanation for my problems with using the Arduino IDE to compile TASMOTA.
Information about installing and using K3b to burn a CD/DVD/Blu-Ray disk has been added to Installing Ubuntu 18.04.1, Additions and Adjustements. This post is in French only.
The New Year seemed like a good time to tackle once again the task of updating the Raspbian operating system on my Raspberry Pi hosting my home automation server. This is but another of my series of posts on setting up a Raspberry Pi so it would be of interest mostly to new fans of small single-board computers. I did manage to do a truly headless installation, and I did resolve some little problems which may be of general interest [...more]
Here are three projects under development that work on the home Wi-Fi network: a touch-controlled lamp, a Wi-Fi temperature sensor, and a weather data display. The first two are connected to home automation software, Domoticz, the latter could be in the future [...more (in French)]
By way of proof that I am far from being an expert in the field, here are some projects that have not succeeded as expected [...more (in French)]
New version of Domoticz
A new version of the home automation server Domoticz (version 4.9700) has been available for a few weeks. This version in now compatible with Raspbian Stretch (version: June 2018, kernel: 4.14).
However, I ran into problems with the secure connection of the video stream as described in the post entitled Secure Webcam streaming with MJPG-Streamer on a Raspberry Pi. For some reason, I can get snapshots through the secure lighttpd proxy server but not the video stream. If I ever solve this mystery, I will update the post.
This is a second take on connecting a Bluetooth speaker to the Raspberry Pi 3 running under Raspbian Stretch (based on Debian 9). In this version, the somewhat more radical route of updating BlueZ is used. This post also goes on to show how the Raspberry Pi 3 can be a used as a Bluetooth speaker playing sound emanating from another Bluetooth enable device. [...more]
Installing Music On Console (MOC) on a Raspberry Pi 3 running with Raspbian Stretch was just as simple as it had been when I installed it on an Orange Pi Zero with Armbian a few weeks ago. However things got complicated when I tried to send the sound out to a Bluetooth speaker [...more]
Update: April 23, 2018
I have just finished translating the April 11 post to French. As often occurs when there is a fair amount of time before I undertake a translation, I actually modified the content a little bit. This reflects the experience I have gained in streaming the webcam. The English version is now updated.
Using MJPG-Streamer it is possible to stream video from a webcam connected to a single core Raspberry Pi B+ that is also running my home automation server and an mqtt broker. Furthermore, using a web server on the same Raspberry Pi, the video stream can be encoded and served over an HTTPS connection. [...more]
With a seeed studio ReSpeaker 2-Mics Pi HAT, it becomes possible to move my voice recognition project over to a Raspberry Pi 3. Hotword recognition will be done with snowboy from KITT.AI. The good news is that the ReSpeaker HAT seems to work well. The bad news is that there is now some sort of incompatibility between snowboy and Google Assistant Service [...more]
This post is just like a ubiquitous YouTube "mailbag" video only without a video feed and without a sound track. In the space of a few days, I have received, from far, far away, five 8G micro SD cards, two ReSpeaker 2-Mics Pi HATs and a Xiaomi Mi WiFi 3G router [...more]
This post is all about using the Music on Console (MOC) audio player on an Orange Pi Zero running Armbian. In other words it is a continuation of the previous post wherein MOC replaces the Music Player Daemon (MPD) which could not quite handle some streams running at higher bit rates. [...more]
These last few days I have been improving my home automation assistant based on experience gained from using the Google Home Mini. While not at all anticipated, the latter's ability to play radio stations has proved useful. It has also been helpful to get weather information with Google Home. Accordingly I wanted to add similar capabilities to my DIY project running on the Orange Pi Zero [...more]
I installed two Python libraries for voice recognition on an Orange Pi Zero running DietPi. The libraries are the hotword recognition engine snowboy from KITT.AI and the excellent SpeechRecognition library by Anthony Zhang (Uberi). It provides a uniform Python interface to many speech recognition engines. I have tested with two online services: Google Speech Recognition and Microsoft Bing Voice Recognition as well as with the off line engine Pocket Sphynx from Carnegie Mellon University. I wrote this back at the end of November, I don't recall the reason I delayed putting it up. [...more]
I have finished translating the corrected post on the use of the Google Home Mini as a home automation voice assistant. The original text was published a week ago and considerably modified since then to remove a bad suggestion on my part that compromised the security of the home automation system. [...more]
Taking advantage of a half price sale before the holidays, I bought the Google Home Mini. Unfortunately, Google Home no longer supports Sonoff switches programmed with Theo Arends' Tasmota firmware. On the other hand, it is possible to create applets with IFTTT to send HTML requests to the Domoticz server and thus control home automation devices with voice commands [...more]
This is a short follow up on a previous blog about using a Raspberry Pi as a remote log server. Using information posted by knowledgeable persons, I removed the source of what turned out to be spurious error messages that were filling up the log... [...more]
A chance meeting with cheap Bluetooth portable speakers with hands free capabilities led to a grand scheme to use them to talk to vocal assistants with the help of a Raspberry Pi 3. Before going ahead with the project, I had to learn the basics of using Bluetooth in Raspbian (Stretch). Here is a description of my first steps in this arcane world. [...more]
Today I had a good reason to test the debug UART port which is next to the RJ45 connector on the Orange Pi Zero. I really like this method of connecting to the headless OPiZ, so I wrote a short note about it [...more]
The cause of all this was an upgrade of Armbian that for some unknown reason went haywire. The system became unusable. I had to update the post about dietPi on the Orange Pi Zero.
I also updated my first post about the
OPiZ to mention that
ssh is not the only way of
logging on the board initially.
- The following posts have been updated:
- Updating to Sonoff-Tasmota (October 31, 2017)
- Programmation du Sonoff dans l'EDI Arduino (2) (2017-05-19)
- Programmation du Sonoff dans l'EDI Arduino (1) (2017-05-17)
- USB-Serial Converter, Counterfeit or Not? (February 9, 2017)
- Flashing a Sonoff with a Raspberry Pi (January 23, 2017)
- Programmation d'un commutateur Sonoff avec un Raspberry Pi (2017-01-23)
esptool.pyor with the Arduino IDE flashing tool. Thanks to Sébastien Giroux for reminding me to update these older instructions.
- I stumbled on the precompiled binaries of
sonoff.inoby Theo Arends. I thus corrected my November 17 update of Flashing a Sonoff with a Raspberry Pi to indicate that ITEAD Sonoff product can be flashed with Theo Arends' latest offering,
Sonoff-Tasmota, with a Raspberry Pi without installing the Arduino IDE
- Firefox Quantum 57.0 has become available on Ubuntu and I mechanically updated. Not a good idea... I lost all my bookmarks and my last backup was quite old. Shame on me. Hope readers of this do better. Also, an older post A Domoticz application in Linux is now out of date. Maybe I will be able to look into updating it in the coming weeks.
- The updating of the
CSSstyle sheet continues. The boxes showing terminal sessions now use an almost black background which more closely resembles what is seen on screen. Hopefully, that is an improvement although it does make the pages look a bit more busy.
The novelty of talking with Mme Google has worn out, it is time to do something practical with voice recognition. Furthermore, who wants an open microphone streaming all sounds in the house to the outside world? I would prefer so called "hot word" recognition to be done locally. I had problems installing snowboy from KITT.AI. Fortunately, some clever people had already found solutions [...more]
The maker of the Orange Pi Zero makes available a number of images of operating systems. I installed Raspian server found on OrangePi.org. I was not impressed it, but I could be wrong of course. In any case, I returned to DietPi. [...more]
Following excellent instructions found on the web, I managed to install Google Assistant on the Orange Pi Zero running the latest version of DietPi. [...more]
The original October 18 post written in French is now available in English. [...more]
Updating to Sonoff-Tasmota by Theo Arends has come around a lot faster than projected. At the same time, it was possible to update to version 2.4.0-rc2 of the Esp8266 Arduino Core which is one more step in preventing a key reinstallation attack (KRACK) [...more]
Theo Arends' replacement firmware for the Sonoff
WiFi switch logs error and information messages to the serial port and
to its webserver by default. It can also log debug messages, and send
all these messages to a
syslog host where they will be stored
to be reviewed later. However logging errors is not the default behaviour
and so I decided to enable it. As my home automation server is a Raspberry Pi running
Debian, it makes sense to use its default
syslog daemon rsyslog.
Curious, I bought another single board computer, the Orange Pi Zero. As a first test, I installed the home automation software Domoticz on it over Armbian. I also installed mosquitto, the MQTT server. Here are my first impressions of how it all works [...more (in French)]
Since the end of May, the company hosting my website has been providing SSL certificates (OpenSSL from cPanel.inc). The site can be browsed securily with the HTTPS protocol. That should inspire confidence; the little green padlock is now visible in the address bar. There was a catch, the style files and images were no longer found when viewing files in sub-directories. A solution had to be found. [...more (in French)]
I took the opportunity to reorganize the site. Updating the site had become a daunting task. New directories have been added, HTML files have been moved, and file names have been changed. I hope that the permanent redirection I have added will make the transition as smooth as possible.
An Update and Small Change
The post on Flashing a
Sonoff from a Raspberry Pi was modified to insist on the need to
turn the Sonoff on and off after flashing. The
script used to upload the firmware cannot perform a hard reset of the
ESP8266 when used as described.
There is now a little envelope icon after my name at the bottom of each page. It should be clearer that these are links to send e-mail messages with questions or suggestions. These links start your default mail client and fill in the subject line with the name of the HTML file containing the link making it easier to identify what your comment or question is about.
In the original September 19 version of the post, I made an important error. Further tests, showed that the board does not boot when powered up from the VIN pin. Hopefully, the seller or manufacturer of the board can help resolve this problem and I suspect that I will be rewriting the post once I get more information. For some users (including myself), this is a significant factor which may tip the scales when comparing the board to the WeMos D1 mini which is not subject to this problem. [...more]
I have purchased a new ESP8266 NodeMCU development board. I compare the latest Geekcreit/DOIT board to the Wemos D1 mini which I have been using up to now. Both based on the "orignal" NodeMCU development kit, they are quite similar but they do offer an interesting tradeoff. [...more]
This post continues with improvements to the third loop watchdog introduced in the previous post. But most importantly, it provide a useful technique to recover in a hands-off way to watchdog timeouts and exceptions. [...more]
Adding a third watchdog is a good idea for some ESP8266/Arduino based projects. That's because it is very easy to write code that feeds the built-in watchdogs but nevertheless goes off the deep end. The task of this watchdog is to ensure that the Arduino loop is executed regularly. [...more]
Updated: August 27, 2017
While the hardware and software watchdog timers of the ESP8266 are essential, they are not sufficient to ensure the kind of reliability needed in an IoT device. In a future post, I will discuss how to implement yet a third watchdog to further improve the dependability of the firmware programmed into this chip. In the mean time, I thought it would be useful to discuss watchdogs in general and to delve into some of the details of the ESP8266 watchdogs. [...more]
This post contains a corrected Python script for reading the temperature and relative humidity from a DHT11 sensor and sending them on to a Domoticz server. Bogus values will not be passed on when it is not possible to read the sensor. The second topic of the post is human comfort as it relates to relative humidity and temperature. This is groundwork for controlling an air exchanger and a dehumidifier in the future. [...more]
This post explains how to connect a DHT series temperature and humidity sensor on the Raspberry Pi GPIO and how to monitor its values in Domoticz, a home automation server hosted on the same Raspberry Pi. There are plenty of descriptions on the Web on how to do this. But most assume that the default One-Wire GPIO pin will be used. Unfortunately, I could not use that pin. To increase the post's value-added, I also describe how to monitor the temperature of the Raspberry Pi [...more]
First, the sidebar about the use of an
independent power supply for the Sonoff in the post entitled Flashing a Sonoff with a Raspberry
Pi was confusing. Hopefully, the new version is an improvement. Thanks
to Robin de Kruyf for pointing out that deficiency.
Second, I updated my Lua script for handling MQTT messages from
Domoticz in the January 30th post NodeMCU, MQTT and Domoticz
- part 2. Turns out that the
CJSON module has been
replaced with the
The missing second post in the new series about home automation with Domoticz on a Raspberry Pi is finally added. I explain how I use FileZilla to more easily modify files on the Raspberry Pi. The instructions on making backups have been moved to this post [...more]
This post explains how I added the X10 ActiveEye Motion Sensor (outdoor model MS16A) to a Domoticz home automation server running on a Raspberry Pi. The latter is linked to the sensor through a CM11A serial computer interface and a RR501 transceiver. It is a reworked version of Adding an ActiveEye Motion Sensor that showed how the same sensor was used with a wireless CM19A computer interface [...more]
This post shows how to use an X10 PalmPad Remote Control to manually control a lamp connected to a Sonoff WiFi switch from ITEAD. This is a continuation of the previous post about the necessity of providing a way of manually turning on and off lamps connected to Sonoff WiFi switches [...more]
This post continues the new series about home automation with Domiticz and ESP8266 based hardware showing how I installed an MQTT broker on the Raspberry Pi and how it is used with the home automation software [...more]
This post continues with the building of a home automation system
using legacy X10 hardware with
This post continues with the building of a home automation system
using legacy X10 hardware with
This is a detailed description of installing the Raspbian operating system and the Domoticz home automation server on a Model B Rev 2 Raspberry Pi and on a Pi 3 Model B. This is the first in a series of posts about DIY home automation using legacy X10 hardware and using the newer, cheaper, and in my opinion better ESP8266 based hardware [...more]
One of the very useful features of the
Sonoff-MQTT-OTA-Arduino firmware for Sonoff switches by Theo
Arends is its ability to update itself over the air (OTA). Here is how
to use this very usefull capability especially once a switch is
This follows the May 15th post, showing how to flash the
Sonofo-MQTT-OTA-Arduino - TASMOTA firmware from Theo Arends on
a Sonoff switch Wifi. TASMOTA is complete and makes adding the switch
in the home automation program Domoticz very simple.
[...more (in French)]
There is nothing very new here. I show how to upload a sketch in a Sonoff WiFi switch from the Arduino IDE. The steps described are a) Installation of the Arduino IDE in Ubuntu; b) Preparation of IDE; c) Serial port access; D) USB-serial connection with the Sonoff switch and e) Uploading a Blink sketch [...more (in French)]
Since the Raspberry Pi does not have a physical clock, schedules events triggered by the time of day will not work properly in Domoticz if access to the Internet is lost during a power failure. The obvious solution is to install a hardware real-time clock (RTC) [...more]
Occasionally it is convenient to control devices with a smart phone or tablet,or even a desktop computer. But, very quickly, one tires of having to use such a device to simply light a lamp. I will describe how I added manual switches to control two bedside lamps connected to Sonoffs... [...more]
This will be one of the last posts about X10 hardware I should think. It shows how to add the combined motion and light sensor to Domoticz. [...more]
This is another short post with additional information about the camera, its software and firmware. [...more]
The Decemter 17th blog on conditional timers in Domoticz was updated. Phil (user PhillChillBill on the Domoticz forum; sorry, I don't know his last name) has written a Perl script to automate the process by creating the bash script I described before. [...more]
The USB-TTL converter ordered on the 27th of November finally arrived
yesterday. Initially, it would not work with
esptool.py to flash
an ESP8266. Was the converter harbouring a counterfeit chip? In the end,
I did find a way to make it work as I wanted
An ITEAD Sonoff WiFi switch with NodeMCU firmware is added to the list of devices controlled with the home automation software Domoticz [...more]
I still have not received the USB-TTL (3.3V) cable to flash and program Sonoff WiFi Switches. Using the Rapsberry Pi as I did to flash the switches is too cumbersome for software development. Si I decided to emulate a Sonoff with a WeMos D1 mini. [...more]
I decided to rewrite the January 23rd posting and to tranlate it into English. It now shows how to use a Raspberry Pi (instead of USB-TTL cable (3.3V) cable) to flash a Sonoff WiFi Switch from ITEAD with one of three firmware: Sonoff-MQTT-OTA-Arduino (TASMOTA), Sonoff-MQTT-OTA and NodeMCU. Full integration of the switch with Domoticz is achieved with the first one without any programming of any sort [...more]
This post continues the exploration of NodeMCU, MQTT and Domoticz begun on the 15th and 17th of January. The subject is how to subscribe to MQTT messages in NodeMCU so as to perform a task based on messages published by other devices to the MQTT broker. In particular a virtual switch in the home automation software will set the WeMos D1 Mini LED on or off [...more]
The USB-TTL cable (3.3V) ordered from China in December is still in transit. My impatience is such that I decided to use a Raspberry Pi to flash a Sonoff switch. I managed to flash two Sonoffs and I can happily report that no Raspberry Pi nor Sonoff was hurt in the process. And the good news is that it takes about ten minutes to program the second: five minutes to solder a connector and five minutes to flash the Theo Arendst firmware: Sonoff-MQTT-OTA. Here are the details [...more (in French)]
The January 15th post has been reworked slightly to better explain the work flow when using NodeMCU with command line tools. In particular, setting the baud rate correctly makes for a smoother experience [...more]
This post continues with the previous one. In it I show how to establish a WiFi connection and how to update a device (a temperature sensor) in the home automation software Domoticz. This is done in two ways: using an MQTT broker and directly using an HTTP request [...more]
When I purchased my first ITEAD Sonoff WiFi switches, I also got a Wemos D1
mini board. I thought using a ESP8266 development kit would be a good way to
prepare for hacking the switches. In this post, I relate how I learned to
program the ESP8266 using a tool chain made up of NodeMCU firmware and
Python command line utilies:
Domoticz uses video cameras as if they were photo cameras: one image at a time. Many security video cameras can snap a photograph even as they send out a video stream. Unfortunately, in the case of the Blitzwolf BW-SIC1 camera, this requires use of the ONVIF api which, apparently, Domoticz cannot do. There seems to be no choice but to write a bash script to pull a frame from the camera's video stream [...more (in French)]
There is an add-on application for the Kodi multimedia player to see the video feed from the BliztWolf BW-SIC1 camera. It is called IP Cam. It is rather easy to do without it and to use Kodi which can read RTSP streams. [...more (in French)]
Setting up the BlitzWolf BW-SIC1 Wifi surveillance camera with the BlitzCam application on a Windows computer [...more]
The BlitzWolf BW-SIC1 wireless security camera spends its firt night in the cold and hits the lower limit of its operating temperature. There is also a short low resolution video. [...more (in French)]
The BlitzWolf BW-SIC1 wireless surveillance camera has interesting features with respect to its relatively low price. Unfortunately, the instructions accompanying this unit are almost incomprehensible. In addition, they contain no information about its use with the Linux operating system. Luckily, it transmits its video streams with the RTSP protocol, so it can be seen and recorded with standard software in Linux. [...more (in French)]