HardLabs

Max7219

baleshwarece-jpg·PCB_PROJECTS·DAY26-MAX7219-8-Digit LED-Display-Driver/max7219.kicad_pcb

Max7219 PCB layout, top view — open source board by baleshwarece-jpg

About the Max7219 PCB

Max7219 is an open source PCB design by baleshwarece-jpg, published on GitHub. It is a 2-layer board measuring 48 × 36.5 mm, with 7 components from 6 distinct parts.

Other key parts include the MAX7219. By type, the board carries 2 diodes, 2 capacitors, 1 IC, 1 connector and 1 resistor.

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

From the project

30-Days-PCB-Design-Challenge

Day 26 / 30 — 30-Day PCB Design Challenge

A driver board built around the MAX7219, which multiplexes and current-limits up to 8 digits of 7-segment LED displays (or a 64-LED dot matrix) from a single SPI-like 3-wire interface, eliminating the need to drive 64+ individual GPIO pins or external current-limiting resistors per segment.

Driving multiple 7-segment displays directly from a microcontroller requires either one GPIO per segment per digit (impractical past 1–2 digits) or a multiplexed scan routine where the MCU rapidly cycles through digits, sinking and sourcing current itself while…

Max7219, from the project README
From the project README

Main components on the Max7219

MAX7219

Max7219 bill of materials (BOM)

7 components, 6 distinct parts.

QtyPartRefs
1
MAX7219
U1
1
Conn_01x05_Pin
J1
1
AD-121F2
D1
1
LED
D2
2
C
C1, C2
1
R
R1

Max7219 design files

The KiCad project lives in the baleshwarece-jpg/PCB_PROJECTS repository on GitHub; these links point at the commit this page was built from.

Max7219: common questions

How big is the Max7219 PCB?

The Max7219 measures 48 × 36.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Max7219?

7 components, from 6 distinct parts. The full bill of materials is listed on this page.

Where can I download the Max7219 design files?

From the baleshwarece-jpg/PCB_PROJECTS repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Max7219 design in my own project?

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

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