#charlieplexing — Public Fediverse posts

@dendrobatus_azureus

A binary clock only needs 9 leds. With multiplexing, that's just 6 leads. With #Charlieplexing... five?

So, either an ATTiny with some kind of decoder chip, or a slightly larger ATmega chip?

Oh, maybe this!!! https://www.adafruit.com/product/3677
That could even drive the LEDs individually, no multiplexing!

I wish I was better at #soldering. It low-key terrifies me. 😆

I could maybe bodge a design for a surface-mount LED board and send it to pcbway and have them a$$emble it?!? 🤷‍♂️

@dendrobatus_azureus

A binary clock only needs 9 leds. With multiplexing, that's just 6 leads. With #Charlieplexing... five?

So, either an ATTiny with some kind of decoder chip, or a slightly larger ATmega chip?

Oh, maybe this!!! https://www.adafruit.com/product/3677
That could even drive the LEDs individually, no multiplexing!

I wish I was better at #soldering. It low-key terrifies me. 😆

I could maybe bodge a design for a surface-mount LED board and send it to pcbway and have them a$$emble it?!? 🤷‍♂️

Как я сделал брелок на ATtiny13, научил его трем гипнотическим режимам и превратил в набор для пайки

Представьте: маленький брелок лежит в кармане. На нём — мордочка кота из популярного мема. Нажимаешь кнопку на затылке — и в центре головы загорается круг из двенадцати ярких SMD-светодиодов. Два огонька начинают бегать по кругу с коротким хвостом. Ещё одно нажатие — и запускается спиннер: три луча вращаются по часовой, потом три круга против. Третий режим — маятник, три светодиода плавно качаются взад-вперёд, как загипнотизированный взгляд. Четвёртое нажатие — и всё гаснет. Батарейка CR2032 отдыхает. Всё это работает на самом дешёвом микроконтроллере ATtiny13. Четыре пина управляют двенадцатью светодиодами через Charlieplexing. Никаких Arduino, никаких сдвиговых регистров.

https://habr.com/ru/articles/1044438/

#ATtiny13 #Charlieplexing #DIY #набор_для_пайки #SMD #светодиоды #брелок #встраиваемые_системы

And now a followup on how to actually update a row of LEDs efficiently, using bitplanes:
https://aykevl.nl/2026/01/bitplanes/

#EmbeddedSoftware #firmware #hardware #leds #Charlieplexing

And now a followup on how to actually update a row of LEDs efficiently, using bitplanes:
https://aykevl.nl/2026/01/bitplanes/

#EmbeddedSoftware #firmware #hardware #leds #Charlieplexing

Charlieplexing LEDs is actually really neat, if you understand how it works. It's basically just a LED matrix where you use the same pins on both sides of the matrix. I've written about it in my latest blog post:
https://aykevl.nl/2026/01/charlieplexing/

Charlieplexing is what allows my 36-LED earrings to have so many LEDs - I would have needed a bigger microcontroller without Charlieplexing.

#Charlieplexing #led #LEDMatrix

Charlieplexing LEDs is actually really neat, if you understand how it works. It's basically just a LED matrix where you use the same pins on both sides of the matrix. I've written about it in my latest blog post:
https://aykevl.nl/2026/01/charlieplexing/

Charlieplexing is what allows my 36-LED earrings to have so many LEDs - I would have needed a bigger microcontroller without Charlieplexing.

#Charlieplexing #led #LEDMatrix

Track Your Circuits: A Locomotive PCB Badge https://hackaday.com/2025/04/18/track-your-circuits-a-locomotive-pcb-badge/ #charlieplexing #PCBHacks #ATmega32 #badge #train #pcb

Track Your Circuits: A Locomotive PCB Badge https://hackaday.com/2025/04/18/track-your-circuits-a-locomotive-pcb-badge/ #charlieplexing #PCBHacks #ATmega32 #badge #train #pcb

Track Your Circuits: A Locomotive PCB Badge - This fun PCB from [Nick Brown] features a miniature railroad implemented with 0805... - https://hackaday.com/2025/04/18/track-your-circuits-a-locomotive-pcb-badge/ #charlieplexing #pcbhacks #atmega32 #badge #train #pcb

Track Your Circuits: A Locomotive PCB Badge - This fun PCB from [Nick Brown] features a miniature railroad implemented with 0805... - https://hackaday.com/2025/04/18/track-your-circuits-a-locomotive-pcb-badge/ #charlieplexing #pcbhacks #atmega32 #badge #train #pcb

Fluid Simulation Pendant Teaches Lessons in Miniaturization https://hackaday.com/2025/01/13/fluid-simulation-pendant-teaches-lessons-in-miniaturization/ #charlieplexing #fluiddynamics #metalworking #simulation #MiscHacks #LEDHacks #mcp73832 #ADXL362 #jewelry #stm32 #led

Fluid Simulation Pendant Teaches Lessons in Miniaturization https://hackaday.com/2025/01/13/fluid-simulation-pendant-teaches-lessons-in-miniaturization/ #charlieplexing #fluiddynamics #metalworking #simulation #MiscHacks #LEDHacks #mcp73832 #ADXL362 #jewelry #stm32 #led

Fluid Simulation Pendant Teaches Lessons in Miniaturization - Some projects seem to take on a life of their own. You get an idea, design and pro... - https://hackaday.com/2025/01/13/fluid-simulation-pendant-teaches-lessons-in-miniaturization/ #charlieplexing #fluiddynamics #metalworking #simulation #mischacks #ledhacks #mcp73832 #adxl362 #jewelry #stm32 #led

Fluid Simulation Pendant Teaches Lessons in Miniaturization - Some projects seem to take on a life of their own. You get an idea, design and pro... - https://hackaday.com/2025/01/13/fluid-simulation-pendant-teaches-lessons-in-miniaturization/ #charlieplexing #fluiddynamics #metalworking #simulation #mischacks #ledhacks #mcp73832 #adxl362 #jewelry #stm32 #led

Baffle the Normies with This Binary Thermometer https://hackaday.com/2024/06/08/baffle-the-normies-with-this-binary-thermometer/ #charlieplexing #classichacks #thermometer #Digispark #LEDHacks #attiny85 #binary #dht11

Baffle the Normies with This Binary Thermometer https://hackaday.com/2024/06/08/baffle-the-normies-with-this-binary-thermometer/ #charlieplexing #classichacks #thermometer #Digispark #LEDHacks #attiny85 #binary #dht11

Baffle the Normies with This Binary Thermometer - We think it’s OK to admit that when someone puts a binary display on a project, it... - https://hackaday.com/2024/06/08/baffle-the-normies-with-this-binary-thermometer/ #charlieplexing #classichacks #thermometer #digispark #ledhacks #attiny85 #binary #dht11

Baffle the Normies with This Binary Thermometer - We think it’s OK to admit that when someone puts a binary display on a project, it... - https://hackaday.com/2024/06/08/baffle-the-normies-with-this-binary-thermometer/ #charlieplexing #classichacks #thermometer #digispark #ledhacks #attiny85 #binary #dht11

Trying to charlieplex a 10 segment bargraph with 4 different colours (and hence 4 different resistances) off 4 pins. Without using 10 resistors because I don't have that much space on this little board. Which I can almost do trivially except one of the colours is 4 bars so can't get them all through one resistor but have to share with one of the other colours...

Time to get the random number generating computer program out.

#Charlieplexing #LEDs

Trying to charlieplex a 10 segment bargraph with 4 different colours (and hence 4 different resistances) off 4 pins. Without using 10 resistors because I don't have that much space on this little board. Which I can almost do trivially except one of the colours is 4 bars so can't get them all through one resistor but have to share with one of the other colours...

Time to get the random number generating computer program out.

#Charlieplexing #LEDs

2 days of learning charlieplexing and PIO on the rp2040 only for it to just not work and have no real indication as to why. Best guess is that maybe the LEDs aren’t all the same. I guess tomorrow I’m playing around with that PIO emulator - and therefore once again installing the JDK 😫

Also I suspect that my PIO program isn’t very good. No idea what would improve it though! #rp2040 #pico #charlieplexing #LEDs #pio

2 days of learning charlieplexing and PIO on the rp2040 only for it to just not work and have no real indication as to why. Best guess is that maybe the LEDs aren’t all the same. I guess tomorrow I’m playing around with that PIO emulator - and therefore once again installing the JDK 😫

Also I suspect that my PIO program isn’t very good. No idea what would improve it though! #rp2040 #pico #charlieplexing #LEDs #pio

Supercon Badge Reads A “Punch” Card

https://hackaday.com/2022/11/17/supercon-badge-reads-a-punch-card/

#2022HackadaySupercon #Retrocomputing #charlieplexing #pixelblaze #punchcard #optical #badge #cons

Heart-Shaped Heartwarming Valentine’s Day Pendant - This is no ordinary heart-shaped PCB pendant project! To us, it’s also symbol repr... - https://hackaday.com/2022/01/24/heart-shaped-heartwarming-valentines-day-pendant/ #charlieplexing #steameducation #wearablehacks #pendant #pcbart

Returning Digital Watches To the Analog Age: Enter The Charliewatch - The Charliewatch by [Trammell Hudson] is one of those projects which is beautiful in both design and... more: https://hackaday.com/2019/08/22/returning-digital-watches-to-the-analog-age-enter-the-charliewatch/ #microcontrollers #charlieplexing #wearablehacks #charliewatch #goodwatch #watches #msp430

Tucoplexing: A New Charliplex for Buttons and Switches - Figuring out the maximum number of peripherals which can be sensed or controlled with a minimum numb... more: https://hackaday.com/2019/03/23/tucoplexing-a-new-charliplex-for-buttons-and-switches/ #reverseengineering #microcontrollers #handheldshacks #charlieplexing #stream #kicad