The Nano 328P Expansion Adapter Board with IO Shield is a practical breakout and expansion board designed to sit underneath or around an Arduino Nano, turning its cramped dual-row pin headers into an organised, sensor-ready interface. Anyone who has tried to connect more than two or three modules to a bare Nano knows the problem — the pins are close together, polarity mistakes are easy to make, and managing power rails across a breadboard becomes messy fast. This board solves that.
The adapter accepts an Arduino Nano (ATmega168 or ATmega328P) and exposes all 14 digital I/O pins in servo-style three-pin format: GND, VCC, and Signal. This means standard servo cables, sensor modules with dupont connectors, and most common Arduino accessories plug straight in without any additional wiring. The 8 analog pins are similarly broken out with dedicated power and ground connections, keeping analog readings clean and stable.
Power flexibility is built in. The board provides both 3.3V and 5V output rails and accepts a range of input voltages from 3.3V to 5V, which makes it easy to run alongside Bluetooth modules, display module, or 3.3V sensors without a separate regulator module.
The I²C expansion pins are particularly useful for connecting multiple I²C peripherals — IMU sensors, EEPROMs, real-time clocks, or I²C displays — all sharing the same two-wire bus without custom wiring. Available at StemVolt, this expansion board is a reliable pick for tech enthusiasts and embedded developers who want to get the most out of the Nano’s compact.
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Features:
- Arduino Nano v2.x / v3.x Socket — Accepts both ATmega168 and ATmega328P Nano variants; Nano slots in securely via standard 2.54 mm pin headers
- Servo-Type Digital Pin Headers — All 14 digital I/O pins available as GND · VCC · Signal three-pin rows, eliminating the need for separate power jumpers
- 8 Analog Pins with Power Rails — Each analog channel includes VCC and GND alongside the signal pin for direct sensor connection
- I²C Expansion Headers — Dedicated I²C port rows for connecting multiple devices — ideal for sensor fusion and display projects
- Multiple Power Input Options — Onboard flexibility for powering the shield from different sources, independent of the Nano’s USB connection
Technical Specifications:
| Specification | Details |
|---|---|
| Compatible Board | Arduino Nano v2.x and v3.x (ATmega168 / ATmega328P) |
| Input Voltage | 3.3V – 5V (multiple power input options onboard) |
| Output Voltage | 3.3V and 5V outputs available |
| Digital I/O Pins | 14 servo-type pins (each with GND, VCC, and Signal) |
| Analog Pins | 8 analog pins with power output and GND |
| PWM Pins | 6 PWM output pins |
| Communication Interfaces | I²C expansion pins, 1 × AREF output, UART via Nano |
Applications:
- Educational — Ideal for school and college electronics labs where students need an organised, error-resistant, sensors and modules to an Arduino Nano
- IoT & Wireless Projects — Easily connect HC-05 Bluetooth, NRF24L01, or ESP-01 Wi-Fi modules using the clearly routed signal pins and dual voltage outputs
- Servo-Based Robotics — Control multiple small servos for mini robot arms, pan-tilt camera mounts, or RC mechanisms using the servo-format digital pin headers
- Wearable and Compact Embedded Projects — The Nano’s small size combined with this shield’s organised layout makes it well suited for wearables and enclosure-based builds
- PWM Motor Control Projects — Use the 6 PWM-accessible pins to drive motor driver modules like L298N or L293D for small wheeled robot projects
Package Includes:
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1 × Nano 328P Expansion Adapter Board with IO Shield
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