HardLabs

Led test bar

jkominek·piano-conversion·hardware/led-test-bar/led-test-bar.kicad_pcb

Led test bar PCB layout, top view — open source board by jkominek

About the Led test bar PCB

Led test bar is an open source PCB design by jkominek, published on GitHub under the Custom license license. It is a 2-layer board measuring 174 × 16.5 mm, with 31 components from 2 distinct parts.

By type, the board carries 30 diodes and 1 connector.

It belongs with the audio and sensors designs in this gallery.

From the project

Hardware, and some firmware, for acoustic piano to MIDI controller conversion.

adc-board An STM32H743 reading 22 ADC channels and sending the results over RS485. led-power Provides power to 8 strings of 22 CNY70 IR LEDs. Needs +48V. Optional I2C control. led-test-bar For development only: little bar that holds a bunch of LEDs for testing the LED power board. link-adapter For development only: allows a PC to connect to an ADC or main board. main-board 8 ADC boards can plug in, their processed signals are managed by another STM32H743 and converted to MIDI in its various forms. Intended mainly for USB use, also has ethernet designed in. For all of the optional accessories…

Led test bar bill of materials (BOM)

31 components, 2 distinct parts.

QtyPartRefs
1
Conn_01x31_Male
J1
30
LED_Small
D1, D2, D3, D4, D5, D6, D7, D8 +22

Led test bar design files

The KiCad project lives in the jkominek/piano-conversion repository on GitHub; these links point at the commit this page was built from.

Led test bar: common questions

How big is the Led test bar PCB?

The Led test bar measures 174 × 16.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Led test bar?

31 components, from 2 distinct parts. The full bill of materials is listed on this page.

Where can I download the Led test bar design files?

From the jkominek/piano-conversion repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Led test bar design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

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