https://www.youtube.com/watch?v=nh1SIfipQs4
The temp sensor and transceiver PCB are cast into urethane and the coil gets installed into the hotplate. In theory lets you do all kinds of interesting stuff like monitoring when you can't get a wired probe into the vessel, or to drive a control loop that actually monitors the liquid and not the plate temperature.
Yes, but there are limits on the minimum size. The smallest off the shelf tag I have seen is about 10mm diameter disk sticker.
There are 3x3mm NFC chips but their read range is 2mm..
If you ever build that deck, Joe, call me?
So I took it and was going to put me in my wallet and the dude interrupted me and say: "No, no, you can't have it, I've got only one, you need to scan the QR code".
I found that incredibly cheap ; )
P.S: and also I don't scan random QR codes.
The chip is NXP's NTAG I2C Plus. I picked it for the energy-harvest pin (that's what lights the LED) and only realized later that it ships without NDEF formatting—which is why every consumer NFC app refused to touch it. Sending it raw write commands through Core NFC turned out to be much less scary than I expected: the part that matters is about 60 lines of Swift.
I still can't get over JLCPCB assembling ten of these for about $75.
> I designed the whole board as code, which I’d recommend to anyone who, like me, finds dragging traces around with a mouse maddening. KiCad—the free PCB tool—has a Python API, so the entire card is generated by a script.
I remember years and years ago I made some business cards out of 304 stainless with a laser etched design and bottle opener on the side (before that whole idea became mass marketed). It cost me over a hundred bucks for ten, wild that you can get whole pcb assembly done for less now days.
Even still, it's difficult for me to fully get it. There is so much art in ECAD layout. There are many dimensions to weigh and high levels of thought and care can result in a higher quality, lower cost product. Many nuances are not properly captured by simplistic automations or chatbots and won't be for some time. Things that accelerate schematic capture, layout capture, library management, and simulation are all useful tools. They're most effective when used with care and thoughtfulness.
I also don't like it when humans silently pass off LLM work as their own.
Prompting is not the same as doing the work. There are ways to genuinely collaborate with LLMs, but if someone silently takes full credit for work generated by LLMs, my assumption is they probably vibe coded it.