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2x4Keypad

ConnorBelman·2x4Keypad

2x4Keypad PCB layout, top view — open source AVR/Arduino board by ConnorBelman

About the 2x4Keypad PCB

2x4Keypad is an open source AVR/Arduino PCB design by ConnorBelman, published on GitHub. It is a 2-layer board measuring 122.5 × 62.5 mm, with 32 components from 12 distinct parts.

Its main chip is the ATMEGA32U4, from the AVR/Arduino family. By type, the board carries 8 relays, 8 diodes, 8 capacitors, 4 resistors, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

Main components on the 2x4Keypad

ATMEGA32U4

2x4Keypad bill of materials (BOM)

32 components, 12 distinct parts.

QtyPartRefs
1
ATMEGA32U4
U1
1
XTAL_GND
X1
1
USB_mini_micro_B
J1
8
KEYSW
K1, K2, K3, K4, K5, K6, K7, K8
1
SW_PUSH
SW1
8
D
D1, D2, D3, D4, D5, D6, D7, D8
2
22p
C1, C2
4
0.1u
C3, C4, C5, C6
1
4.7u
C7
1
1u
C8
2
10k
R1, R2
2
22
R3, R4

2x4Keypad design files

The KiCad project lives in the ConnorBelman/2x4Keypad repository on GitHub; these links point at the commit this page was built from.

2x4Keypad: common questions

What microcontroller does the 2x4Keypad use?

The 2x4Keypad is built around the ATMEGA32U4, from the AVR/Arduino family.

How big is the 2x4Keypad PCB?

The 2x4Keypad measures 122.5 × 62.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 2x4Keypad?

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

Where can I download the 2x4Keypad design files?

From the ConnorBelman/2x4Keypad repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the 2x4Keypad design in my own project?

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

Can I test firmware for the 2x4Keypad 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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