Kevin Santo Cappuccio

OLED headers on the rev7 main board

oled scooted over for an Arduino

I2C nets

btw I did fix this in the next rev7 batch being made right now, but it's not gonna be a separate product or anything. People will just start getting these as the other ones run out.

Showing where the OLED plugs into the FPC board

Kicad screenshot of the FPC board

The double switcharoo

It takes some silliness though, you need to bend one of the pins on the OLED module to reach that 5V hole. I was dreading having to describe an ol' double header switcharoo had I put it on the other side.

front right

Right

Back

The idea is to save 2 routable GPIO by having the OLED connect to some spare pins on the FPC board (RP6 and RP7) rather than routing them through the Jumperless matrix. And also it lets you use the OLED while you have an Arduino in that header.

front of the new OLED stand

This is the sort of nonsense you end up doing when trying to support existing hardware rather than just selling a new revision.

Move aside @adobe.com, there's a new drawing app in town...

There are a tons of horrible "image to ASCII" out there . The only one I've found that does quarter block color using fg/bg color fuckery and these bad bois ▖▗▘▙▝

dom111.github.io/image-to-ansi/

I use these in the Jumperless TUI, but hadn't thought to color the quadrants individually like this

bubbly jumperless text showing on the OLED

On today’s edition of features no one asked for: custom OLED splash screens and an onboard bitmap editor.

And even less asked for: you can edit / draw your own using just the clickwheel if you're patient enough.

(Or the non-stupid way, having it mount as a drive and dropping it on the filesystem)

Bubbly Jumperless ANSI image drawn in the terminal

Seeing all those LLM CLI tools having those fun block character title screens made me want my own.

And no, I didn't have an LLM make this, just 6 hours toggling pixels in Photoshop. Pixel art is such a hyperfocus black hole.

I swear QFNs have some weird memory hole effect. I'll find an issue like that, fix it, then be like "okay on the next one, remember to scrape off that pad before I solder this." And then 10 minutes later I'm soldering down the next one without doing that like the previous hours never happened.

I'm out here doing hacky shit in prod, this is shipped hardware.

Luckily the nature of this thing lets me screw around and fix it in a firmware update if I think of something better.

Home - Jumperless Docs Learn how to use your Jumperless

The docs will be updated shortly with details about this and some other new stuff from the past couple weeks.
jumperless.org

There's also second INA219 hardwired to the output of a DAC for sensing resistance. I need to add some better support for that.

Right now I use it to sense the position of the probe switch by checking if it's drawing current to drive the LEDs. It's very hacky.

Yeah. Internally, current sense + and - (either side of the shunt resistor) are just nodes like any other that can be routed anywhere.
It took *so* much rework to get the display / routing to lie to you and show 2 separate nets connected by a fake wire.

anteater sticking its nose through a hole in a fence saying "yall got any a n t s"

This entire feature was just a flimsy pretext to post this image thats lived rent-free in my head for years

Oh no! Ants got into my lab and are all over my breadboard.

Luckily, it's the species commonly found in circuit simulators to visualize current flow. They finally broke out of the simulation onto real hardware.

Good for them.

Whatever you think this is for, I promise you it's more ridiculous than that.

Render of the logo on rev 7 without solder mask showing cap sense pads

My hobby: putting cap sense pads in everything and then never actually using them

I'll think of some hack to let you do something similar with your existing boards (I also have an idea to allow you to add PSRAM by switching out that wishbone LED board.)
This isn't gonna be a new SKU, people will just randomly start getting this version when the old ones run out

OLED under the arduino header

OLED scooted to the right

OLED just friction fitting in some wiggly holes

OLED friction fitting in a different set of wiggly holes

I need to reorder another batch of Jumperless V5s so of course I had to change something. rev7 will have 2 sets of wiggly friction-fit OLED headers on the main board. And you can scoot it over to the right when it would be covered with an Arduino or the Raspberry Pi adapter or something.

Yeah, it totally can. It's become such a core thing that the next batch of boards I order will have the I2C headers on the main board too so you don't need to use that adapter board.
(I guess you don't really *need* to use it now, you can just assign the I2C lines to connect somewhere else.)

Home - Jumperless Docs Learn how to use your Jumperless

But ugh, there's so much new infrastructure in V5 that made this possible (color names > RGB, yaml state files, RTOS(ish) scheduler, fast pathfinding, etc.)

This is a perfect example of a simple feature that ends up being extremely non-trivial once you actually start writing it.

jumperless.org

Too bad no one really uses Wokwi bridging on the V5 because all the other ways to wire stuff are much smoother.

I guess I should backport this whole onboard json parser stuff to the OG where it would be way more helpful, but holy crap that can contains so many worms.

omg finally, the feature everyone wanted on the OG Jumperless like 2 years ago. Wire colors on the breadboard now match the ones you set in your @wokwi.com project!

Quick demo of the most basic (but still magical) feature of Jumperless V5 by @architeuthisflux.bsky.social: making connections without jumper wires.
It can do so much more: power supply, multimeter, oscilloscope, function generator, logic analyzer, etc.
Pardon the shaky, over-caffeinated hands. 😆

Photo of a Jumperless V5 breadboard with a circuit connected. There's an Adafruit QT Py SAMD21, a 74HCT245 level shifter DIP chip, and a 14mm Fibonacc48 on a breakout board, all plugged in to the black breadboard. Instead of wires connecting the components on the breadboard, there are tiny lights showing the "wires".

Jumperless V5 box with an embossed label reading "JASON". This is my Jumperless. There are many others like it, but this one is mine.

Jumperless V5 box sitting on a black t-shirt with a rainbow-colored logo.

A small package wrapped in brown paper with a black and pink glittery spray painted logo.

I know I'm late to the @architeuthisflux.bsky.social Jumperless V5 party, but this thing really is brilliant in every way! 🤩
Get yours: www.crowdsupply.com/architeuthis...

The assembly

After I put it in

Trying out different lenses with blue tack

Yes I have a lot of scrap lenses

This very ridiculous thing is coming along nicely. It's not even meant to be a projector, there was just a huge hole in the case so I decided to throw a lens in there.

Fitting

Drawing (yes that's just black sharpie)

Etching

Boom

The liquid is ferric chloride. It's really not all that toxic to humans, there's just a ton of warnings because it'll eat copper pipes if you pour it down the drain. But I think people conflate that with it being straight-up alien blood to non-copper things too.

Looking into this thing showing the PCB that holds a selector switch

Kinda crazy how easy it is to bust out one-off PCBs with a sharpie and some liquids

Oh yes, this thing will project a 5x5 LED matrix onto you while you use it

Back corner, no idea what that morse code keying button is gonna do

Using my Jumperless Bus Pirate adapter boards as an FPC breakout

Showing the kind of mess projects like this make

This object continues to get sillier...

men will literally do whatever this is instead of using a slip ring