User Tools

Site Tools


projets:fuz:operame

Operame

Project information

  • Owner: Lomanic
  • Participants: you?
  • Status: functional, to be deployed somewhere
  • Project created on Sun 14-11-21 by Lomanic

Goals

  • Implement Operame, a project from the Dutch hackerspace Revspace using a CO2 sensor coupled to a TTGO T-Display to tell people in a room that they should open the windows to limit Covid-19 aerial spread indoors
  • Document it in English
  • Maybe extend it in some way (automatic ventilation system?)

Hardware

As I won't order PCBs online (and specific SMD sockets as shown in soldering instructions video) and just use what I have at hand, it will be assembled on a perfboard I had in my drawer for years.

TTGO T-Display pinout, mirrored from https://github.com/Xinyuan-LilyGO/TTGO-T-Display

Pinout:

TTGO T-Display      MH-Z19C
   5V                 VCC
   GND                GND
   D26                RX
   D27                TX

D12 on the TTGO has to be grounded but it's not obvious why

Software

https://github.com/revspace/operame unmodified, had to install vscode (vscodium doesn't have platformio in its openvsx store) and the appropriate driver on Windows so platformio could flash the TTGO T-Display onboard ESP32

In action

The Operame device is shown mounted on temporary breadboards with bridges made of Dupont wires as a proof of concept

Perfboard implementation, front

Perfboard implementation, back

Log

2021-11-14

Initial proof of concept with breadboard, everything works perfectly.

Then perfboard implementation. A first for me, quite the hassle, I probably didn't go the easiest way with the solder traces and then the cables on the back. A multimeter with continuity mode is a must have to ensure there's no short between traces.

Next time, solder traces are not worth the time and headache and cables should just be soldered through holes with a single solder joint to the next hole.

Planned

  • deploy it somewhere? (at Fuz or at Lomanic's office)
  • automatic ventilation system (if at Fuz)?
  • statistics?
projets/fuz/operame.txt · Last modified: 2021/11/14 20:56 by lomanic