HardLabs

Button board r2

picafe·bicolor-matrix-v2·button-board-r2/button-board-r2.kicad_pcb

Button board r2 layout, top view — open source board by picafe

About the Button board r2

Button board r2 is an open source PCB design by picafe, published on GitHub. It is a 4-layer board measuring 91.9 × 12.4 mm, with 10 components from 6 distinct parts.

Other key parts include the VEML6030 and TTP223-BA6-TD. By type, the board carries 5 capacitors, 3 ICs and 2 connectors.

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

From the project

A 32x8 bicolor LED matrix module composed of 4 8x8 matrices based on the Holtek HT16K33A I2C LED driver. V1 paired it with a stacked adapter (RP2040 Zero + DS3231 module); V2 redesigns the matrix routing and puts an ESP32-C3, RTC, and environment sensors on a half-length adapter

A 32x8 bicolor LED matrix module composed of 4 8x8 matrices based on the Holtek HT16K33A I2C LED driver. V1 paired it with a stacked adapter (RP2040 Zero + DS3231 module); V2 redesigns the matrix routing and puts an ESP32-C3, RTC, and environment sensors on a half-length adapter board behind the display.

Inspired by the common 32x8 red LED matrix modules that use the MAX7219 IC, I wanted to make my own module but with more colours and functionality, while keeping the same asthetic.

Button board r2, from the project README
From the project README

Main components on the Button board r2

VEML6030TTP223-BA6-TD

Button board r2 bill of materials (BOM)

10 components, 6 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
VEML6030
VISHAY(威世)
U1
2
TTP223-BA6-TD
U2, U3
1
CONN_01X04_SOCKET
Conn_01x04_Socket
J1
1
CONN_01X07_PIN
Conn_01x07_Pin
J2
3
100NF
100nF
YAGEO
C1, C3, C5
2
22PF
22pF
Samsung Electro-Mechanics
C2, C4

Button board r2 design files

The KiCad project lives in the picafe/bicolor-matrix-v2 repository on GitHub; these links point at the commit this page was built from.

Button board r2: common questions

How big is the Button board r2?

The Button board r2 measures 91.9 × 12.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Button board r2?

10 components, from 6 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Button board r2 design files?

From the picafe/bicolor-matrix-v2 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Button board r2 design in my own project?

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

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