Uncontrolled Mechanical Ventilation

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.

It was the last task of my todo list for this project: rewrite open2300 in a modern langage. This is now done in rust: ws2300.

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.