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Pico-Scanned-Keyboard-Matrix-Emulator

stephen-usher·Pico-Scanned-Keyboard-Matrix-Emulator

Pico-Scanned-Keyboard-Matrix-Emulator PCB layout, top view — open source RP2040/RP2350 board by stephen-usher
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About the Pico-Scanned-Keyboard-Matrix-Emulator PCB

Pico-Scanned-Keyboard-Matrix-Emulator is an open source RP2040/RP2350 PCB design by stephen-usher, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 81 × 60 mm, with 17 components from 11 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the 74VLC244, 74LS244 and MAX232. By type, the board carries 4 ICs, 4 connectors, 2 capacitors, 1 module and 1 resistor.

It belongs with the keyboards designs in this gallery.

From the project

Raspberry Pi Pico based scanned matrix keyboard emulator

This is a generic scanned keyboard matrix emulation board based upon a Raspberry Pi Pico.

It supports any scanned keyboard matrix which has up to 8 scan lines (outputs from the computer) and 12 sense lines (inputs to the computer).

The board itself is really just a Pico interface board with 8 TTL compatible inputs to the GPIO and 12 TTL compatible outputs with an RS232 compatible interface to the default UART. The 8 and 12 pin ports are contiguous ranges on the Pico allowing PIO operations as a bus. All the keyboard matrix magic happens in software. It's using 74LVC244 chips to act as…

Main components on the Pico-Scanned-Keyboard-Matrix-Emulator

74VLC24474LS244MAX232RaspberryPi_Pico

Pico-Scanned-Keyboard-Matrix-Emulator bill of materials (BOM)

17 components, 11 distinct parts.

QtyPartRefs
2
74VLC244
U1, U2
1
74LS244
U3
1
MAX232
U4
1
RaspberryPi_Pico
A1
1
Matrix Scan Lines
J1
1
Matrix Sense Lines
J2
1
Power Connector
J3
1
RS232
J4
5
0.1uF
DC1, DC2, DC3, DC4, DC5
2
1uF
C1, C2
1
10K
RN1

Pico-Scanned-Keyboard-Matrix-Emulator design files

The KiCad project lives in the stephen-usher/Pico-Scanned-Keyboard-Matrix-Emulator repository on GitHub; these links point at the commit this page was built from.

Pico-Scanned-Keyboard-Matrix-Emulator: common questions

What microcontroller does the Pico-Scanned-Keyboard-Matrix-Emulator use?

The Pico-Scanned-Keyboard-Matrix-Emulator is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the Pico-Scanned-Keyboard-Matrix-Emulator PCB?

The Pico-Scanned-Keyboard-Matrix-Emulator measures 81 × 60 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pico-Scanned-Keyboard-Matrix-Emulator?

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

Where can I download the Pico-Scanned-Keyboard-Matrix-Emulator design files?

From the stephen-usher/Pico-Scanned-Keyboard-Matrix-Emulator repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Pico-Scanned-Keyboard-Matrix-Emulator design in my own project?

Yes, under the terms of its CC0-1.0 license, which stephen-usher chose for the repository.

Can I test firmware for the Pico-Scanned-Keyboard-Matrix-Emulator without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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