kaipereira
Joined 2 years ago
Karma
389
Submissions
30
Member since
Feb 20
Recent submissions
Comment · 7 days ago
This is awesome!
How does the rigidity of the keyboard hold up with many keys and what's the cost of the materials at higher order quantity?
Comment · 2 months ago
There’s no SAO connector because I wasn’t thinking too straight at 4am designing these badges, but I’ll make sure to add one in future badges, because I agree that they’re really cool!
Comment · 5 months ago
I’m working on 2 hardware projects right now!
Fold-up, scissor lift, cross-cantilever 3D printer for open sauce
M.2 FPGA hardware accelerator devboard
All just for fun and open source https://github.com/kaipereira :D
Comment · 6 months ago
I personally love this macropad tutorial and it's how I got into doing circuit board design in highschool: https://hackpad.hackclub.com/. Before doing this, it's really helpful if they have experience messing around with breadboards, so getting them a kit can help them into a soft transition too!
I like to suggest making a macropad, then a keyboard, then going into a devboard, and then starting to make your own projects. But for kids that aren't quite in highschool yet, it can feel quite intimidating and the learning curve is moderately high, so getting them playing with breadboards first might be the best option ;)
Hack Club will also give you a grant to cover the entire cost if your kids are over 13 through their programs like stasis, fallout, or forge (you can check their site for more info)
Comment · 6 months ago
This is insanely cool, the noise they make is also really satisfying!
What was the cost/time breakdown of the entire project because the flipdisc prices are hidden behind quotes and it seems like it would take quite a lot of time to complete the whole display!
Comment · 6 months ago
Thanks so much!
Comment · 7 months ago
This is so cool! I'd love to see a write-up on how made it, and what you referenced because designing neural networks always feel like a maze ;)
Comment · 7 months ago
We ordered the PCB's and badges separately, but it's extremely easy to assemble, you just attach the eink on using the FPC connector and the badges are already in a complete setup of the hardware if you get PCBA.
You can make it more fun on yourself if you want to assemble them by hand and it's probably a bit cheaper, and JLC will ship to pretty much anywhere in the world.
Comment · 7 months ago
Yeah the RP2040 is a bit overkill, but it's really cheap to get from JLC, easy to prototype FAST and easy if anyone wants to reference the design and create/program their own badges.
I have been looking at some other MCU's like the CH32 for future projects, so if you also have any suggestions for other ones, I'd love to hear them!
Comment · 7 months ago
I used https://eds.st.com/antenna/#/ to get an antenna that fit with a target inductance of 4.7uH and then used https://github.com/nideri/nfc_antenna_generator to create the footprint which I slightly modified for the board! You can read a bit more about it in the journal (JOURNAL.md)!
It was really satisfying to get everything working (especially the NFC because I've found RF to be a bit tricky), but the eink logic was actually a bit of gamble, because I broke my only eink while prototyping so the production batch was the first test of the driver. So always carry spare components when designing prototypes!
Comment · 7 months ago
So the eink holds its state once it’s programmed so you do need an initial program of the badge through USB-C, and then the NFC uses passive RF harvesting.
Comment · 7 months ago
The total ended up being about $10/badge for 60 (5 for badge, 5 for eink), and we made the mistake of not ordering enough, so we ordered a couple more that were about $1 more expensive each. We bought all the badges from JLC and the prod files are in the repo if you want to see how much they come to in higher order quantity!
https://kaipereira.com/