Login

Recent searches

No recent searches

Search options

Only available when logged in.
fosstodon.org is one of the many independent Mastodon servers you can use to participate in the fediverse.
Fosstodon is an invite only Mastodon instance that is open to those who are interested in technology; particularly free & open source software. If you wish to join, contact us for an invite.

Administered by:

Server stats:

10K
active users

fosstodon.org: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.3.6

FreeCAD

Good lord... it's once again! What are you wonderful lot working on in at the moment?

Feb 14, 2025, 10:41 AM·Public
3boosts·15favorites
Public
Tinx

@FreeCAD thanks for asking!
However, the new enclosure for my simple ATtiny85-powered CO2 indicator looks a bit scared. Be gentle!
#FreeCADFriday #FreeCAD #KiCad #3Dprint #gadget #gadgets

Front (or rather back) view of the CO2 sensor case. A hole for the USB type-C socket looks like a mouth, two chamfered screw holes look like eyes. A socket for a photo resistor is visible on the "forehead". Eyebrows have been added to complete a cute but scared-looking face.
Isometric view of the CO2 sensor case featuring the ventilation holes at the side.
A look inside the case (cap removed) shows the PCB exported from KiCad. Visible are the socketed MH-Z19C CO2 sensor and a socket for the ATtiny85 along with several pin headers and smaller components. The USB breakout is not rendered. The brackets at the top can hold a section of a NeoPixel/WS2812 strip to indicate the air quality via colored light that will light up the transparent case.
Public
ricardo

@tinx @FreeCAD pretty dope. I don’t blame him. CO2 is pretty scary.

Public *
Tinx

@FreeCAD take a look at the fully assembled CO2 indicator :)

It always pays to follow a parametric design.
I tweaked one or two values to correct some spacings, et voilà…
#FreeCADFriday #FreeCAD #KiCad #3Dprint #gadget #gadgets

Front view of the fully assembled CO2 indicator. It glows green to indicate a low CO2 level. The light that filters through the vents creates an interesting pattern around the gadget. An USB type-c cable is plugged into the "mouth". The screws that hold case together resemble eyes. A photo resistor is visible on the "forehead". The eyebrows are not visible due to the low ambient light. The main part is printed from transparent filament while the cap that resembles the face is printed from black filament to reduce interference between LED and photo resistor.
The CO2 indicator is shot diagonally from the top-right. It glows red this time to indicate a high CO2 level.
ExploreLive feeds
About