Custom Arduino Minimal Circuit Design (PCB)
Designed a minimal Arduino-compatible circuit with reduced components for cost-efficient embedded system deployment.
January 7, 2026
ArduinoPCB DesignKiCadEmbedded Systems
Overview:
A minimal Arduino-compatible board built around the ATmega328P-M microcontroller with an integrated CH340E USB-to-Serial interface for direct programming via USB.
The goal of this project is to demonstrate a compact and practical Arduino hardware implementation using minimal components while maintaining full functionality.
Design Approach:
Removed unnecessary components from standard Arduino boards and created a compact PCB design. The board consists of four main functional blocks:
Microcontroller
- ATmega328P-M
- External 16 MHz crystal
- Reset circuit
USB Interface
- CH340E USB to UART converter
- Micro USB connector
Power Regulation
- LM1117-3.3 linear regulator
- Input protection and filtering
Status Indicators
- Power LED
- TX/RX communication LEDs
Key Features: - Compact PCB design
- Reduced component count
- Cost-efficient solution
Schematic & Layout:
Challenges:
Maintaining stability while minimizing components.
Applications:
This board can be used for:
- Embedded system prototyping
- IoT projects
- Arduino-based hardware development
- Learning custom PCB design for microcontrollers