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2 layers52 × 57.5 mmArduCore, the printed circuit board in 3D

ArduCore

urjadoshi2024etc-creator/ArduCore-Custom-Arduino-Board

My own Arduino-style development board built from scratch using a DIP ATmega328P and custom KiCad PCB.

Full screenGitHub.kicad_pcb
Size
52 × 57.5 mm
Copper layers
2
Thickness
1.6 mm
Parts
19
Nets
29
Pads
88
Tracks, vias
202, 36
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
19 Sep 2026
Updated
30 Oct 2026

Overview

ArduCore is an open-source printed circuit board by urjadoshi2024etc-creator, from the urjadoshi2024etc-creator/ArduCore-Custom-Arduino-Board repository on GitHub. It is a 2-layer board of 52 × 57.5 mm with 19 parts on 29 nets, routed with 202 tracks and 36 vias.

It is built around the ATMEGA328P-PU, AS7805AT-G1 and 470UF 25V. Its parts include 4 capacitors, 4 connectors, 1 resistor, 1 IC and 1 diode. It belongs with the microcontroller boards boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

3

README

README.md

⚡ ArduCore

My Own Arduino Development Board

ArduCore Banner

So Why did I make a PCB named ArduCore?

I wanted to go one step deeper.

Instead of using a ready-made Arduino board, I designed the microcontroller circuit, power section, reset circuit, clock circuit, headers, and PCB layout myself.

I wanted my own Arduino Devboard so made this project

Schematic

ArduCore Schematic

PCB Layout

ArduCore PCB Layout

3D PCB View

ArduCore 3D PCB --- ## Programming

Arduino ISP

ArduCore does not contain a dedicated USB-to-Serial programmer.

Instead, another Arduino can be used as an ISP programmer.

bash
┌───────────────────────┐
│   Arduino Programmer  │
│                       │
│     ArduinoISP        │
└───────────┬───────────┘
            │
            │ ISP
            │
            ▼
┌───────────────────────┐
│       ArduCore        │
│                       │
│     ATmega328P        │
└───────────────────────┘

Detailed instructions:

Programming ArduCore with Arduino ISP

🎥 Project Demo

Yet to be implemented

Manufacturing

Manufacturing files are available in:

bash
production/gerbers/

Gerber Package

ArduCore-Gerbers.zip

Bill of Materials

The complete component list is maintained in:

bash
production/bom/

BOM

ArduCore-BOM.csv

Grant Budget ($25 B-Tier)

This project is submitted under the B-Tier ($25 max) hardware grant for custom development boards.

Cost Breakdown

ItemDescriptionEstimated Cost
PCB FabricationCustom 2-layer PCB (5 pcs) via JLCPCB~$2.00
Shipping & HandlingStandard global shipping for manufactured PCBs~$10.50
Component BOMATmega328P-PU, 16 MHz Crystal, 7805 regulator, THT passives, switches, & pin headers~$6.50
Total Requested$19.00

Tools I Used

  1. Kicad
  2. Arduino IDE
  3. Github

--- This project started with a simple question ---

"What's actually inside an Arduino?"

Build it. Break it. Understand it. Improve it.

Parts

19
QtyValueFootprintReferences
2100nF_CeramicCapacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm100nF, 100nF
222nFPCM_SparkFun-Capacitor:C_0603_1608MetricC3, C4
2470uF_25VCapacitor_THT:CP_Radial_D8.0mm_P3.50mmC470uF_25V, C470uF_25V
110kPCM_SparkFun-Resistor:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR1
110uH_5x5mm_1.0APCM_Inductor_THT_AKL:L_Axial_L6.6mm_D2.7mm_P10.16mm_Horizontal_Vishay_IM-21OuH
1330 RResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal330 R
1AS7805AT-G1Package_TO_SOT_THT:TO-220-3_VerticalU2
1ATmega328P-PPackage_DIP:DIP-28_W7.62mmAtmega328p
1Conn_01x07_PinPCM_SL_Connectors:PinHeader_1x07_P2.54mm_VerticalJ1
1Conn_01x08_PinConnector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_VerticalJ3
1Conn_01x14_PinConnector_PinSocket_2.54mm:PinSocket_1x14_P2.54mm_VerticalJ2
1Crystal_16MHzCrystal:Crystal_HC49-4H_Vertical16 MHz (XTAL)
1Ext_supplyPCM_SparkFun-Connector:ScrewTerminal_1x02_P3.5mm_Horizontal_BlackJ4
1LOGOLOGOG***
1Push_ButtonButton_Switch_THT:SW_PUSH_6mmReset
1RedPCM_SparkFun-LED:LED_5mm_PTH_Red_SilkD1

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Questions

How big is the ArduCore PCB?

It measures 52 × 57.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the ArduCore use?

19 parts, built around the ATMEGA328P-PU, AS7805AT-G1 and 470UF 25V. 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 ArduCore KiCad files?

From the urjadoshi2024etc-creator/ArduCore-Custom-Arduino-Board repository on GitHub, at the commit this page was made from: the board is pcb/ArduCore.kicad_pcb and its schematic pcb/ArduCore.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the ArduCore design in my own project?

Its repository states no licence, so its author keeps all rights: ask urjadoshi2024etc-creator before reusing the design.