I working on different open source project (one at the time)

[Irilia]

I working on different open source project, they are all based on the esp32 S3
I have some one for the Code in C, Lots of random problem because the compiler is still in development but the majority of things are working. I'm developing a product that do power supply, hot air, soldering iron and  simple multimeter by default (can be adapted how you want if you modify the code) by default every fonction is optional, but the code will be pre made. The part will be available from different sellers as a kit, it's beginner friendly, and made to take the less space possible, 3 tier will be available, with 3 different quality (obviously you have what you pay for) everything will use the. GAN technology my goal is to get the most efficient possible, (I don't consider a linear power supply because of the inefficient and the bulkiness, but it's totally possible to add one if you need). Obviously a website for the different projects will be open with a forum.

In a second time I want to do an universal PCB, for the different types of appliances, they are all controlled the same way just the numbers of Relay that changes (basically) and because it's open source everyone can adapt the Code how they want, this solution is durable, and the same PCB will be usable in 20 year. I will not implement any connectivity (no Bluetooth or WiFi) because I'm looking for a stable option no useless thing (because it's an ESP the community can add the connectivity if they want obviously.

I hope you find these projects interesting 😉

Ps) for now I'm looking for an open source multimeter Chip so if anyone knows one I'm interested.
Thanks in advance.

[tooki]

Ps) for now I'm looking for an open source multimeter Chip so if anyone knows one I'm interested.

Open-source chips? Are you seeking to fabricate your own silicon at home? 

So what do you actually mean by "open-source" in this case?!?

There are plenty of multimeter chips out there, for example the MAX1499. But fundamentally, you need a suitable A/D converter and then design a front end around it that implements the features you want. If you think there's a chip out there that implements an entire multimeter circuit, including the front end, input protection, and other essentials, you are sorely mistaken. (And from the questions you ask, I don't think you are quite knowledgeable enough at this time to be designing an entire multimeter.)