Charlieplexing Pi Pico business card

Building a charlieplexed 6x6 LED display (with Raspberry Pi Pico) business card

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A credit card sized (89x51mm) 6x6 LED display with charlieplexing (using only 7 pins of a Raspberry Pi Pico). The pico will be showing the hour, minute and temperature in binary up until you press a touch button, when it will show your contact information on the LED display and OLED 0.96".

My original idea was to supply the desing with a single CR2032 coin cell. But considering the LEDs power consumption and the Pi Pico itself (which I have not found supplied with a coin cell on the internet so far), I have decided to got with USB power.

Also my plan is to use a Pi Pico W so that I can fetch hour and minute from the internet to display on the charliplexed LEDs.

Height of things (because it is a business card):

- PCB 0.6mm

- Pi Pico W 4mm

- 0.96" OLED display 2.8mm

So the maximum height of the project/card will be 0.6+4mm, going to 4.6mm (0.023 inches)


Portable Network Graphics (PNG) - 81.48 kB - 05/10/2024 at 16:34



image/jpeg - 85.76 kB - 05/10/2024 at 16:31


  • 1 × Raspberry Pi Pico W microcontroller
  • 36 × LED SMD 0805 Fiber Optics / Emitters
  • 1 × Push button button
  • 7 × 1k 0805 SMD resistor
  • 1 × 0.96" OLED yellow/blue i2c display

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