2 layers80 × 50 mm Customised Arduino Uno Layout, the printed circuit board in 3D

Customised Arduino Uno Layout

This project is a custom-designed Arduino Uno compatible PCB developed using KiCad. The design is based on the ATmega328P microcontroller and integrates multiple hardware modules such as motor driver, seven segment…

Full screen GitHub .kicad_pcb

Size: 80 × 50 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 58
Nets: 52
Pads: 194
Tracks, vias: 298, 80
Pours: 318
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 18 Apr 2026
Updated: 18 Apr 2026

Overview

Customised Arduino Uno Layout is an open-source printed circuit board by sidhesh1010, from the sidhesh1010/Custom-Arduino-Uno-Board repository on GitHub. It is a 2-layer board of 80 × 50 mm with 58 parts on 52 nets, routed with 298 tracks and 80 vias.

It is built around the ATMEGA328-AU, CD4511BE and L293D, with the LTW-C191TLA among its other parts. Its parts include 21 resistors, 17 capacitors, 5 ICs, 2 diodes and 2 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

Custom Arduino Uno Compatible PCB

Overview

The goal of this project is to create a multifunctional embedded system board that extends the capabilities of a standard Arduino Uno by integrating additional peripherals directly on the PCB.

Objectives

Design a complete Arduino-compatible PCB from scratch
Integrate multiple modules into a single hardware platform
Learn PCB routing, power distribution, and component placement
Gain practical experience in embedded hardware design

Key Features

ATmega328P microcontroller (main controller)
On-board 5V regulated power supply using 7805
Motor driver interface (L293D) for DC motor control
Seven segment display driver (CD4511)
RGB LED module for visual output
Push button switches for user input
Potentiometer for analog input
ISP debug/programming header
Compact PCB with organized routing and labeling

Functional Blocks

Power Supply Section

DC input via power connector
Reverse polarity protection diode
7805 voltage regulator for stable 5V output
Filtering capacitors for noise reduction

Microcontroller Unit (ATmega328P)

Central processing unit of the board
External crystal oscillator for clock stability
Decoupling capacitors for noise suppression
Connected to all peripheral modules

Motor Driver Section

L293D motor driver IC
Supports control of DC motors
Controlled via microcontroller digital pins

Seven Segment Display Section

CD4511 BCD to 7-segment decoder
Connected to MCU for numeric display output
Current limiting resistors used for segment protection

RGB LED Module

RGB LED with individual control lines
Resistors for current limiting
Can be controlled using PWM signals

Input Controls

Push button switches for digital input
Potentiometer connected to analog input (ADC)
Useful for testing user interaction

Debug / Programming Header

ISP header for programming ATmega328P
Supports bootloader burning and firmware upload

Project Preview

Schematic Design

Schematic

PCB Routing Layout

Layout

3D View

PCB Specifications

Board Size: ~80mm × 50mm
Mounting Holes: 4 (for enclosure support)
Through-hole + SMD mixed design
Clearly labeled silkscreen for easy debugging

Components Used

Component	Description
ATmega328P	Main microcontroller
7805	5V voltage regulator
L293D	Motor driver IC
CD4511	7-segment decoder
Crystal Oscillator	Clock source
Capacitors	Filtering & decoupling
Resistors	Current limiting
RGB LED	Visual output
Push Buttons	User input
Potentiometer	Analog input
Connectors	Power & I/O

Tools Used

KiCad (Schematic + PCB Design)

Important Notes

This is a custom Arduino-compatible board, not an official Arduino product
Ensure correct power input (avoid over-voltage)
Verify component orientation before powering the board
Suitable for educational and prototyping purposes

Future Improvements

Add USB-to-Serial interface (CH340 / FT232)
Add onboard voltage regulator alternatives (switching regulator)
Improve grounding with full ground plane
Optimize routing for high-current paths
Add protection circuits (fuse, reverse polarity protection)

Files Included

.kicad_pro → Project configuration
.kicad_sch → Schematic design
.kicad_pcb → PCB layout

Learning Outcomes

This project demonstrates:

Embedded system hardware design
Multi-module PCB integration
Power supply design
Signal routing and layout optimization
Practical use of KiCad for real-world projects

Category and platform

AVR (ATmega, ATtiny)

Project files

Show this board on your page

https://pcbkit.io/boards/sidhesh1010/Custom-Arduino-Uno-Board

The board's own page, for a message or a post.

Source

Repository: sidhesh1010/Custom-Arduino-Uno-Board
Board file: Customised Arduino Uno Layout.kicad_pcb
Commit: d867a6c
Licence: Not stated

Parts

Qty	Value	Footprint	References
10	0.1uF	C0603	C1, C4, C6, C9, C10, C12, C14, C15, C16, C17
7	330R	R0603	R5, R6, R7, R8, R9, R10, R11
6	1k	R0603	R12, R13, R14, R16, R18, R19
4	MOUNT-HOLE2.8	2,8_237	H1, H2, H3, H4
3	2k	R0603	R2, R3, R4
2	0R	R0603	R15, R17
2	100uF	CPOL-RADIAL-2.5MM-6.5MM_510	C2, C3
2	10K	R0603	R20, R21
2	10uF	C0603	C5, C13
2	22pF	C0603	C7, C8
2	Switch	SW_1437566-3	SW1, SW2
1		LED-TRICOLOR-5050_529	RGBLED0
1		MA04-2_162	DEBUG/PROG0
1	16MHz	HC49US_511	Y1
1	1A/40V	SMA-DIODE_514	D1
1	22uF	C0603	C11
1	2K	R0603	R1
1	7806DT	TO252_262	IC1
1	ATMEGA328-AU	QFP80P900X900X120-32N	U3
1	CD4511BE	DIP794W45P254L1969H508Q16	U2
1	DC Power Jack	GCT_DCJ200-05-A-XX-X_REVA	PWR0
1	L293D	DIL16_368	IC2
1	LTW-C191TLA	LEDC1608X65N	D2
1	MOTOR1	CONN_282836-2	CON1
1	MOTOR2	CONN_282836-2	CON2
1	POT	S64W_331	POT0
1	SSD	LED_SC52-11HWA	U1

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Questions

How big is the Customised Arduino Uno Layout PCB?

It measures 80 × 50 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Customised Arduino Uno Layout use?

58 parts, built around the ATMEGA328-AU, CD4511BE, L293D and LTW-C191TLA. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Customised Arduino Uno Layout KiCad files?

From the sidhesh1010/Custom-Arduino-Uno-Board repository on GitHub, at the commit this page was made from: the board is Customised Arduino Uno Layout.kicad_pcb and its schematic Arduino uno Hardware Schematic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Customised Arduino Uno Layout design in my own project?

Its repository states no licence, so its author keeps all rights: ask sidhesh1010 before reusing the design.