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After three years in my house, I realized the ventillation is always at the maximun speed. I looked for a switch, previously unseen… nothing. I’m not an handyman, I don’t know how to pull a wires and add a switch. Nevermind, hack that and install a wireless switch. A minute! I already had a weather station pluged on a raspberry pi, why push a button when it can be automatically done according to the weather. Make it!
This projet is splited in several steps:
After the first fail, the first bug. I like bugs in a hardware project, they usually occur in real word. For this bug, is during a night under the stars in my garden. When the CMV is at the hight speed, and without other sound, I clearly listen many speed switches. After a good night, I looked this graph:
Ok, there is a bug. Two bugs in fact.
A first bug, the root of bugs, is my rewrite in rust of open2300. There is many fails (~90% of reads). I don’t (yet) find where is the problem.
But reseted the speed when the read fails is a second bug. Using ws2300 as subcommand in the cronjob caused sending (null). I simply handle this case in the vmc script via this commit.
I created my first pcb, etched it with the toner transfert method and, finaly, soldered it.
First fail, the USB connector is on the wrong side (good news: inverted vcc and ground doesn’t destroying components).
Second, the esp8266 doesn’t power up.
Step 6: the dashboard.
Over the updates, I realized this project may be a little complex due to many software peaces. I writed ansible recipes to recreate the two raspberry pi boxes (weather and vmc) : https://github.com/sanpii/domotic-box/.
For fun, and because soldering prototype board is painful, I created my first PCB with kicad. Not tested yet, but the sources are available in the sensor repository.
Step 5: create temperature/humidity sensors.
Step 4: graph your data.
Third step: plug a raspberry pi near your CMV and uncontrol its.
First step: collect weather data and store in a database.
Before starting, you can have a look at this repository. This is a set of ansible recipes for two vagrant VMs (weather and vmc) that contains all softwares described below.
I had put the weather station on my electric meter because it also retreives consumption informations [fr].
Tips: put the termometer under metal sheets is probably not a good idea…
apt install mosquitto-clients
* * * * * /usr/bin/mosquitto_pub -t domotic/weather -m "$(/home/pi/ws2300 /dev/ttyUSB0)"
Sanpi
Laurence
marcell marosvolgyi
Edoardo
barbercayman