HardLabs

Sample Numeric Keyboard

famichu·MagLev_Switch_MX·Sample_Numeric_Keypad/PCB/Sample_Numeric_Keyboard.kicad_pcb

Sample Numeric Keyboard PCB layout, top view — open source AVR/Arduino board by famichu

About the Sample Numeric Keyboard PCB

Sample Numeric Keyboard is an open source AVR/Arduino PCB design by famichu, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 82 × 120 mm, with 62 components from 12 distinct parts.

Its main chip is the ATmega328-AU, from the AVR/Arduino family. Other key parts include the SeeeduinoXIAO and MagLevSwitch. By type, the board carries 20 ICs, 18 diodes, 15 resistors, 5 transistors, 1 connector and 1 capacitor.

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

From the project

The 3D printable magnetic levitation contactless switch with the linear output hall effect sensor.

When the axis is pushed, the magnetism will cancel each other out, which causes the magnetism detected by hall effect sensor to become zero. This is how this switch works. This method made the switch smaller, allowing it to have the same shape as existing switches.

Sample Numeric Keyboard, from the project README
From the project README

Main components on the Sample Numeric Keyboard

SeeeduinoXIAOMagLevSwitchATmega328-AU

Sample Numeric Keyboard bill of materials (BOM)

62 components, 12 distinct parts.

QtyPartRefs
1
SeeeduinoXIAO
U1
16
MagLevSwitch
U2, U3, U4, U5, U6, U7, U8, U10 +8
2
MagLevSwitch
U9, U16
1
ATmega328-AU
U20
5
Q_PMOS_GSD
Q1, Q2, Q3, Q4, Q5
1
Conn_02x03_Odd_Even
J1
1
HDSP-4850_2
BAR1
1
R_POT
RV1
18
D
D1, D2, D3, D4, D5, D6, D7, D8 +10
1
C
C1
5
1k
R1, R2, R3, R4, R5
10
10
R6, R7, R8, R9, R10, R11, R12, R13 +2

Sample Numeric Keyboard design files

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

Sample Numeric Keyboard: common questions

What microcontroller does the Sample Numeric Keyboard use?

The Sample Numeric Keyboard is built around the ATmega328-AU, from the AVR/Arduino family.

How big is the Sample Numeric Keyboard PCB?

The Sample Numeric Keyboard measures 82 × 120 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sample Numeric Keyboard?

62 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sample Numeric Keyboard design files?

From the famichu/MagLev_Switch_MX repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Sample Numeric Keyboard design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Sample Numeric Keyboard 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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