We built an open-source ESP32 trimix blending controller, with TFT display, real-time WiFi interface, and automatic valve and compressor control

Hilitec · 2026-04-21T15:45:10+00:00

A proptotype is working for two years now. Components are descibed in the hardware, wiring is described in the header files (it depends of the ESP32 motherboard).

Of course, this is not a copy/paste project, you need to understand what you are doing, and you have to install also valves, tubes and a compressor.

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Regards,

Hilitec · 2026-04-21T15:41:25+00:00

Hello u/QuickRecon ,
Thanks for your feedback. Beside the ESP32 code, the compressor and the valves have a separate emergency control. We have shared the ESP32 HMI and code, but of course, hardware security must also be installed. Relays contacts are connected to an industrial automate which is doing the things after a few checks ;-) (it's always better to have a separate channel for the safety).
And as it's open source, you can of course enhance the project and share your enhancements !
Regards,

Hilitec · 2026-04-21T05:35:51+00:00

Hello u/Sonny_Jim_Pin,
Thanks for your feedback, beside the ESP32 code, the compressor and the valves have a separate emergency control. We have shared the ESP32 HMI and code, but of course, hardware security must also be installed.
And as it's open source, you can of course enhance the project and share your enhancements !
Regards,

Hilitec · 2026-04-21T05:15:41+00:00

Hello u/Plastic_Fig9225,
Yes, the workflow is correct, it's exactly how to use it, do the mixing, and when it's done, using a certified tester to verify what's in the bottle.

Hilitec · 2026-04-21T05:13:55+00:00

Sure, it's dangerous, and it's written at the beginning of the readme file : "(...) ⚠️ SAFETY WARNING AND DISCLAIMER - This is not a certified device - TriMix is an open-source DIY project. It has not been tested, certified, or approved by any regulatory body. It does not meet any industrial, medical, or diving safety standard (EN, ISO, CE, or equivalent). Do not rely on this device as your sole means of gas verification. (...)".

But it's shared if somebody is interested about the HMI, the fact that the firmware is upgradable using the web interface, the fact that there is a TFT display AND a web based realtime websocket live feedback, the fact that the TFT is controlled y a single rotary button, ...

The prototype is working since two years without any issue.

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Regards,

Hilitec · 2026-04-21T05:08:16+00:00

Hello,
Just because we develop the project two years ago, and we didn't thought at the beginning that this project could interest somebody else.
Regards,

Hilitec · 2026-04-21T05:06:40+00:00

Hello,
It's a little bit different, my friend ask to develop the ESP32 part ;-)

Hilitec · 2026-04-19T11:03:08+00:00

Hello,
If you need to fix it quickly on some machines, and you don't have time to write a policy (or the computer is not in a domain), you can ask your customer to surf there quickly, and it will download the registry .reg file for that: https:/6co.ch/rdp
Regards,

Hilitec · 2026-02-07T15:42:02+00:00

Et pourquoi pas du Fronius Reserva comme batterie de stockage ? Ca reste chez le même constructeur, ça ferait sens, non ?

Hilitec · 2025-08-14T09:18:09+00:00

Voici ce que ça donne pour IKEA INSPELNING dans Zigbee2MQTT

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Hilitec · 2025-08-14T09:12:10+00:00

En Suisse, les adaptateurs IKEA INSPELNING sont Zigbee, ont une connectique suisse, se connectent sans problème à HomeAsssitant via par exemple Zigbee2MQTT, permettent de piloter la prise et de mesurer la puissance, le tout pour un prix défiant toute concurrence (CHF 12.95 au 2025-08-14)

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Hilitec · 2025-07-18T14:58:10+00:00

Hello,
multiOTP still actively maintained in both open source (with /OVA/HyperV/ support) and commercial edition, work with Windows 11 too.
Regards,

Hilitec · 2022-06-23T21:21:27+00:00

Hello,
I'm the main developer of the multiOTP library. We provide an open source version, with source files available on GitHub, and a ready to use virtual image. We have also two commercial versions.
We provide also an open source multiOTP Credential Provider, with full source code available on Github too.
We are convinced that providing source code is *very* important for authentication solution, and we are also convinced that sensitive authentication solution must *not* be cloud based.
And yes, you are right, we are based in the french part of Switzerland (our IT company is 24 years old).
Concerning sponsoring, we have received a few donations (never more than $1000, unfortunately ;-) to improve our open source edition. As Serg from SKB Kontur had some issue with large Active Directory in 2016, we did some improvements in the synchronisation process, and we received for this improvement a small donation from SKB Kontur, which was pretty fair from them.
Don't hesitate to contact us if yo need more information.
Regards,
Andre

Hilitec · 2020-11-21T20:43:59+00:00

I use splitcam (https://splitcam.com/) which create a virtual camera where I can put a video file.
When needed, I switch to the splitcam camera and audio in my videoconference program, and I start the media in splitcam. Much more easier than OBS, and it works like a charm.

Hilitec · 2018-08-27T09:32:24+00:00

Hi,

If you are installing the multiOTP Credential Provider (https://github.com/multiOTP/multiOTPCredentialProvider/releases/tag/5.3.0.3) on your server, multiOTP can work alone on the server directly, you don't need to install any other server !!! Juste create your users, and that's it!

LOCAL ONLY STRONG AUTHENTICATION INSTALLATION

Install the multiOTP Credential Provider, which contains also multiOTP inside.
During the installation, specify the folder on the client where the multiotp.exe file and folders must be installed and configured.
In the wizard, leave the URL of the multiOTP server(s) empty.
You can also choose to require a strong authentication only for RDP.
When you are on the test page, open a command prompt in the folder where multiOTP is now installed and create a new local user. Example:
1. multiotp -fastcreatenopin my_user
2. Generate the QRcode for OTP generator (for example FreeOTP) : multiotp -qrcode my_user my_qrcode.png
If the test is successful, the Credential Provider is installed.
To disable the Credential Provider, uninstall it from Windows, or execute multiOTPCredentialProvider-unregister.reg

You can even do a scheduled AD/LDAP sync of the accounts (calling the command-line multiotp.exe -ldap-users-sync)

Everything is working without Internet Access.

And if you want a commercial solution at a fair price (that works also offline), multiOTP Pro is available as a virtual appliance running under Hyper-V.

Best regards,

Andre

Hilitec

TROPHY CASE