HardLabs

Arduino UNO R4 Minima

sabogalc·KiCad-Arduino-Boards·KiCad Projects/Uno/Arduino UNO R4 Minima/Arduino UNO R4 Minima.kicad_pcb

Arduino UNO R4 Minima PCB layout, top view — open source AVR/Arduino board by sabogalc

About the Arduino UNO R4 Minima PCB

Arduino UNO R4 Minima is an open source AVR/Arduino PCB design by sabogalc, published on GitHub under the WTFPL license. It is a 2-layer board measuring 68.6 × 53.3 mm, with 72 components from 36 distinct parts.

Its main chip is the R7FA4M1AB3CFM#AA0, from the AVR/Arduino family. Other key parts include the ISL854102FRZ-T. By type, the board carries 26 resistors, 23 capacitors, 8 connectors, 4 LEDs, 3 diodes and 3 inductors.

From the project

A collection of Arduino boards recreated from scratch in KiCad. Legacy USB connectors have been replaced with USB-C where applicable.

- Silkscreen Squares: The silkscreen square etches on the left side were a bit cumbersome to design. - Microcontroller Routing: Routing beneath the R7FA4M1AB3CFM#AA0 microcontroller was also relatively intricate, as seen below.

Naturally, shorting any one of these pins to the other can cause a detrimental short, and the 0.5mm pitch makes it easy to do so. Please be careful when soldering the buck regulator!

Arduino UNO R4 Minima, from the project README
From the project README

Main components on the Arduino UNO R4 Minima

R7FA4M1AB3CFM#AA0ISL854102FRZ-T

Arduino UNO R4 Minima bill of materials (BOM)

72 components, 36 distinct parts.

QtyPartRefs
1
R7FA4M1AB3CFM#AA0
U1
1
ISL854102FRZ-T
U2
1
ECS-160-18-33-JGN-TR
Y1
1
M20-9980345
J1
2
PPTC081LFBN-RC
J2, J6
1
USB_C_Receptacle_USB2.0_16P
J3
1
PJ-102AH
J4
1
PPTC061LFBN-RC
J5
1
PPTC101LFBN-RC
J7
1
M52-040023W0545
J8
1
TS06-667-30-BK-100-G-SMT-TR
S1
1
TestPoint
TP12
3
NTE30007
DL1, DL2, DL4
1
HSMG-C190
DL3
2
PMEG6020AELRX
D2, D3
1
PRTR5V0U2X,215
D4
2
BLM18PG471SN1D
L1, L2
1
10uH 2.3A
L3
2
15p
C1, C3
1
DNP
C2
Show 16 more
QtyPartRefs
3
4.7u
C4, C7, C11
5
100n
C5, C6, C8, C10, C12
2
1u
C9, C20
6
22u
C13, C15, C16, C17, C18, C19
1
33p
C14
1
4.7n
C21
1
1n
C22
1
100p
C23
2
5.1k
R1, R2
9
5.1k
R3, R4, R5, R6, R7, R8, R9, R24 +1
4
100k
R10, R13, R21, R22
3
0
R11, R12, R20
4
330R
R14, R15, R16, R17
2
13.7k
R18, R26
1
249k
R19
1
1M
R23

Arduino UNO R4 Minima design files

The KiCad project lives in the sabogalc/KiCad-Arduino-Boards repository on GitHub; these links point at the commit this page was built from.

Arduino UNO R4 Minima: common questions

What microcontroller does the Arduino UNO R4 Minima use?

The Arduino UNO R4 Minima is built around the R7FA4M1AB3CFM#AA0, from the AVR/Arduino family.

How big is the Arduino UNO R4 Minima PCB?

The Arduino UNO R4 Minima measures 68.6 × 53.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Arduino UNO R4 Minima?

72 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Arduino UNO R4 Minima design files?

From the sabogalc/KiCad-Arduino-Boards repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Arduino UNO R4 Minima design in my own project?

Yes, under the terms of its WTFPL license, which sabogalc chose for the repository.

Can I test firmware for the Arduino UNO R4 Minima 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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