this post was submitted on 18 Mar 2026
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Programming
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Not programming per se, but I've been working on some electronics projects. If you check my profile, there's two PCB designs that I've posted. They're fairly simple, but I'm working on a larger project that I should be posting relatively soon. Currently I'm just waiting on a shipment of parts, because I didn't realize I would need XNOR gates.
I see, I'm not super familiar. My extent of PCB design is a custom slimevr board for myself.
The solderable 16 byte ROM design is interesting, I could maybe see it being in some kind of debugger?
Oh, that's cool. I hadn't heard of slimevr before.
My use case for the diode ROM board is to take 4 binary input bits (16 possible combinations) and translate them into what segments of a 7-segment LED display should be lit or unlit, in order to display the corresponding hexadecimal digit (0-9, A-F). Like so:
It could be used for any other case where you need to convert a 4-bit input into 16 possible 8-bit outputs. In theory you could use them in multiples for more address space, but I forgot to include an enable pin on the board to allow for that. Something to add to the next version.
Maybe I'm not very experienced. Why would someone need a device to translate a 4-bit input to an 8-bit output, is it not just 0110 -> 0000 0110?