2 layers68.8 × 53.6 mm
Relatively Universal ROM Programmer
AndersBNielsen/Relatively-Universal-ROM-Programmer
Hardware to program W27C512 EEPROM or any 24/28/32 pin ROM requiring from 5V to 27V programming voltage.
149 parts257GPL-3.0
2 layers80 × 90 mm
4 bit counter
IaMdEvJaXoN/4bitArduinoCounterThis is a 4 bit binary counter project using Arduino Uno. The project is about counting from (0000)2 to (1111)2.The counting process can be observed using 4 LEDs with the rightmost LED being the LSB and also there's an LCD using the 12C protocol for reference.
- Size
- 80 × 90 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 36
- Pads
- 55
- Tracks, vias
- 99, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Aug 2026
- Updated
- 26 Aug 2026
Overview
4 bit counter is an open-source printed circuit board by IaMdEvJaXoN, from the IaMdEvJaXoN/4bitArduinoCounter repository on GitHub. It is a 2-layer board of 80 × 90 mm with 12 parts on 36 nets, routed with 99 tracks and 0 vias.
It is built around the ARDUINO UNO R3. Its parts include 4 resistors, 4 diodes and 1 connector. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.md4-Bit Arduino_Uno_R3 Binary Counter (Hardware & Firmware)
Author: Jackson Asiligwa Status: Completed Proof of Concept
This project demonstrates a full-stack embedded hardware design for a 4-bit binary counter using arduino uno R3, complete with an I2C LCD readout and discrete LED indicators.
Tech Stack
- Firmware: C++, PlatformIO, Arduino Framework
- Hardware Design: KiCad 8 (Schematic Capture & PCB Layout)
- Simulation: Wokwi in VS Code. diagram.json in Wokwi web
Simulation & Logic Verification
The logic and firmware were verified using the Wokwi simulator before routing physical hardware. The simulation verifies the 4-bit counting logic across the digital output pins and I2C text rendering.
Hardware Design
The PCB acts as a custom carrier board (shield) for the Arduino Uno R3. It features standard 2.54mm headers for an I2C LCD backpack and utilizes through-hole (THT) resistors for LED current limiting.
How to Run Locally
- Clone this repository.
- Open the folder in VS Code with the PlatformIO extension installed.
- To view the simulation, install the Wokwi extension,get the commnunity licence(it's easy and fast-less than 10 seconds), open
diagram.jsonfile in the root folder, and start the simulator.
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4 |
| 4 | LED | LED_THT:LED_D5.0mm_Horizontal_O6.35mm_Z15.0mm | LED1, LED2, LED3, LED4 |
| 1 | Arduino_UNO_R3 | Module:Arduino_UNO_R3 | A1 |
| 1 | Conn_01x04_Pin | Connector:FanPinHeader_1x04_P2.54mm_Vertical | J1 |
The 10 most common of 12 parts.
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Questions
How big is the 4 bit counter PCB?
It measures 80 × 90 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 4 bit counter use?
12 parts, built around the ARDUINO UNO R3. 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 4 bit counter KiCad files?
From the IaMdEvJaXoN/4bitArduinoCounter repository on GitHub, at the commit this page was made from: the board is hardware/4 bit counter.kicad_pcb and its schematic hardware/4 bit counter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 4 bit counter design in my own project?
Its repository states no licence, so its author keeps all rights: ask IaMdEvJaXoN before reusing the design.