9
Whatup programmers (programming.dev)
submitted 4 months ago* (last edited 4 months ago) by to c/programming@programming.dev
37 comments fedilink hide all child comments
 

To anyone reading, im leaving. The moderation on this place sucks.

I cant tell someone to add authentication to their app I cant tell anyone to self reflect

But people are allowed to bully others out of learning? yeah bye

you are viewing a single comment's thread
view the rest of the comments
[–] 5 points 4 months ago (1 child)

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.

  • permalink
  • fedilink
  • source
  • hideshow 2 child comments
    •
  • [–] [S] 2 points 4 months ago (1 child)

    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?

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 2 points 4 months ago (1 child)

    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:

    Diode ROM in use

    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.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] [S] 1 point 4 months ago (1 child)

    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?

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 2 child comments
    •
  • [–] 1 point 4 months ago

    Ah, sorry, I could have been more clear there. It can do arbitrary mappings between input values and output values. So for each possible 4-bit value, you can pick a different 8-bit value to be output.

    For my case, I'm working with a 7-segment LED display, like the display on a microwave. It's got 7 LEDs arranged to display a number, plus an 8th LED for a decimal point. Like this:

    |   |

    |   |

    .

    if the ROM is getting 0000 for its input, it should light up all segments of the 7-segment display except for the horizontal one in the center, to display a zero. Then for the 0001 input, it should light up the two vertical segments on the right, leaving the rest dark, to display a one. And so on. Each output bit goes to a particular segment of the display.

    To relate it more directly to programming, it's like having a 16 byte array. The input gives the array index that you want to access, and the output gives whatever byte is at that index.

  • permalink
  • fedilink
  • source
  • parent