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LED matrix

dstreby·LED_matrix·assets/kicad/LED_array_clock.net

LED matrix

About the LED matrix PCB

LED matrix is an open source AVR/Arduino PCB design by dstreby, published on GitHub. It is a board, with 97 components from 11 distinct parts.

Its main chip is the ATTINY261A-P, from the AVR/Arduino family. Other key parts include the ULN2003A, MCP7940M and 74HC595. By type, the board carries 80 diodes, 5 ICs, 3 switches, 3 capacitors, 3 resistors and 1 crystal.

It belongs with the displays & leds designs in this gallery.

From the project

LED Matrix based clock

A simple clock with 16x5 LED Matrix display using SIPO shift registers to allow individual addressing of 80 LED's via 8 digital GPIO's. Timing provided via RTC with XTAL.

This is noting revolutionary, and it's certainly been done a million times before, but never by me. This is essentially a learning experience for me. I've decided on a 16x5 matrix size as it will be convenient to adopt into a digital clock using a 3x5 digits, plus ":" and spaces.

Main components on the LED matrix

ATTINY261A-PULN2003AMCP7940M74HC595

LED matrix bill of materials (BOM)

97 components, 11 distinct parts.

QtyPartRefs
1
ATTINY261A-P
IC1
1
ULN2003A
U1
1
MCP7940M
U2
2
74HC595
U3, U4
1
CRYSTAL
X1
2
R_PACK8
RP1, RP2
3
SW_PUSH
SW1, SW2, SW3
80
LED
D1, D2, D3, D4, D5, D6, D7, D8 +72
1
CP1
C1
2
C
C2, C3
3
R
R1, R2, R3

LED matrix design files

The KiCad project lives in the dstreby/LED_matrix repository on GitHub; these links point at the commit this page was built from.

LED matrix: common questions

What microcontroller does the LED matrix use?

The LED matrix is built around the ATTINY261A-P, from the AVR/Arduino family.

How many components are on the LED matrix?

97 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the LED matrix design files?

From the dstreby/LED_matrix repository on GitHub, which has a netlist; the links under Design files point to each one.

Can I use the LED matrix design in my own project?

The repository has no license, so all rights stay with dstreby. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the LED matrix without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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