2 layers68.8 × 53.6 mm
ZArduino
zmaker/arduino_cookbook
gli sketch del nuovo progetto Arduino Cookbook e dei video di YouTube
46 parts269
2 layers45 × 74.5 mm
Octoboard
hhhug000/octoboardAn 8 bit microcontroller dev board for the ATMEGA328P-PU
- Size
- 45 × 74.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 32
- Pads
- 111
- Tracks, vias
- 279, 47
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Jul 2026
- Updated
- 25 Jul 2026
Overview
Octoboard is an open-source printed circuit board by hhhug000, from the hhhug000/octoboard repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 45 × 74.5 mm with 32 parts on 32 nets, routed with 279 tracks and 47 vias.
It is built around the ATMEGA328P-PU. Its parts include 8 capacitors, 8 connectors, 4 diodes, 3 resistors and 2 ICs. It belongs with the microcontroller boards boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdOctoboard
An ATmega328P-PU development board designed from scratch in KiCad for prototyping AVR projects without breadboard mess. It uses only THT components to simplify soldering, and does not use an onboard serial chip to save on cost and simplicity
Octoboard breaks out all the GPIO from the chip, and provides all power management and supporting hardware.
The BOM is for 5 boards, as that is the minimum I can buy from JLCPCB and some parts
Built for the Hack Club Stardance YSWS program
Visuals
Renders
| Front | Back | Angle |
|---|---|---|
 |  |  |
PCB
| All Layers | Front Layer | Back Layer |
|---|---|---|
 |  |  |
Explainer Video
Design and Specs
- Microcontroller ATmega328P-PU (DIP-28 package)
- Clock speed External 16 MHz crystal oscillator
- I/O All GPIO pins broken out to standardized 2.54mm pitch female headers
- Power management Steps down barrel jack or input voltage to clean filtered 5v for the chip, and broken out for components
- Programming Is programmed with standard Arduino C++, or any other lang with support like TinyGo or Micropython
Notes
Make sure to flash the bootloader to the board in Arduino IDE even if you will only use ICSP. This is because it programs the fuses, and programs will not work properly without it.
Programming
The device can be programmed in a variety of languages. I have personally tested it with Arduino C++ and my own blockly based system. The device can be programmed with avrdude or the arduino ide.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4, C5, C6 |
| 3 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3 |
| 2 | 1kO | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3 |
| 2 | 20pF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2 |
| 2 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4, J5 |
| 2 | LED | LED_THT:LED_D3.0mm | D2, D4 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | 10kO | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D3 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 47uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C7 |
| 1 | 47uf | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C8 |
| 1 | ATmega328P-P | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J7 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | Crystal | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | ICSP | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Vertical | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | Serial Board | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
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Questions
How big is the Octoboard PCB?
It measures 45 × 74.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Octoboard use?
32 parts, built around the ATMEGA328P-PU. 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 Octoboard KiCad files?
From the hhhug000/octoboard repository on GitHub, at the commit this page was made from: the board is pcb/octoboard.kicad_pcb and its schematic pcb/octoboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Octoboard design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).