Nano 328P Expansion Adapter Board with IO Shield

The Nano 328P Expansion Adapter Board with IO Shield is a purpose-built expansion board for Arduino Nano v2.x and v3.x (ATmega168 or ATmega328P) that converts the Nano’s compact dual-row pinout into 14 servo-type digital pin headers, 8 analog pin headers, 6 PWM outputs, I2C expansion pins, an AREF output, and both 3.3V and 5V regulated output rails on separate accessible headers. The arduino nano io shield seats the Nano module in a central ZIF-style or fixed socket and exposes every pin in a standard VCC-GND-Signal arrangement for direct sensor and actuator connection without any breadboard.

The nano expansion adapter board is the most practical solution to the Arduino Nano’s breadboard space problem — the Nano’s 0.1-inch pitch dual-row pins span most of a standard breadboard width, leaving almost no rail space for sensor wiring on either side. This nano 328p shield mounts the Nano above the expansion PCB and brings all connections out to labelled 3-pin servo headers that accept standard Dupont cables and sensor module connectors directly. The 3.3V and 5V outputs on this board draw their current from the Nano’s onboard regulators. The Nano 3.3V pin is limited to 50mA — avoid connecting multiple 3.3V sensors simultaneously if total current draw exceeds this limit.

The non-obvious advantage of the dual-voltage output (both 3.3V and 5V simultaneously) is that mixed-voltage sensor builds — combining 5V ultrasonic modules with 3.3V IMU sensors on the same Nano sketch — can be wired to the correct power rail directly from the expansion headers without external LDOs. The arduino nano adapter board is IOT labs for compact sensor builds, servo robot projects, and quick breadboard-free prototyping. Available from StemVolt, this unit is suitable for engineers working on Arduino Nano sensor interfacing and practical compact electronics projects.