HardLabs

Keypad

Fabian0520·FabiVan

Keypad PCB layout, top view — open source AVR/Arduino board by Fabian0520

About the Keypad PCB

Keypad is an open source AVR/Arduino PCB design by Fabian0520, published on GitHub under the Custom license license. It is a 2-layer board measuring 76.3 × 115.3 mm, with 89 components from 26 distinct parts.

Its main chip is the ATMEGA32U4, from the AVR/Arduino family. Other key parts include the IS31FL3733-TQLS4. By type, the board carries 19 relays, 19 LEDs, 18 capacitors, 17 diodes, 10 resistors and 3 connectors.

Main components on the Keypad

IS31FL3733-TQLS4ATMEGA32U4

Keypad bill of materials (BOM)

89 components, 26 distinct parts.

QtyPartRefs
1
IS31FL3733-TQLS4
IC1
1
ATMEGA32U4
U1
1
Crystal_GND24
Y1
1
Conn_01x04_Female
J1
1
B3FS-1002P
J3
1
USB_C_Receptacle_USB2.0
J4
18
KEYSW
K1_1, K1_2, K1_3, K1_4, K2_1, K2_2, K2_3, K2_4 +10
1
KEYSW
K4_4
19
LED_RABG
D_LED_1, D_LED_2, D_LED_3, D_LED_4, D_LED_5, D_LED_6, D_LED_7, D_LED_8 +11
8
D_x2_KCom_AAK
D1, D2, D3, D4, D5, D6, D7, D8
3
D
D9, D10, D11
6
SK6805
D13, D14, D16, D18, D21, D23
4
0.1u
C1, C2, C3, C4
1
4.7u
C5
1
1u
C6
2
22p
C7, C8
4
0.1uF
C9, C13, C15, C17
1
0.47u
C10
4
0.47uF
C11, C14, C16, C18
1
22uF
C12
Show 6 more
QtyPartRefs
2
10k
R1, R4
2
22
R2, R3
2
1k
R5, R6
1
20k
R7
1
100k
R8
2
56k
R9, R10

Keypad design files

The KiCad project lives in the Fabian0520/FabiVan repository on GitHub; these links point at the commit this page was built from.

Keypad: common questions

What microcontroller does the Keypad use?

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

How big is the Keypad PCB?

The Keypad measures 76.3 × 115.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keypad?

89 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Keypad design files?

From the Fabian0520/FabiVan repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Keypad 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.

Can I test firmware for the Keypad 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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