The Uno + WiFi R3 (ATmega328P + ESP8266) is the ultimate "All-in-One" development board for IoT (Internet of Things) enthusiasts. At Electrapac, we recommend this board for advanced makers who want the massive library support of the Arduino Uno combined with the powerful Wi-Fi capabilities of the ESP8266—all on a single PCB.

Product Overview

This hybrid board integrates a full ATmega328P microcontroller and an ESP8266 Wi-Fi module with an expanded 32Mb (4MB) Flash memory. Unlike using two separate boards with messy jumper wires, this unit features an onboard 8-way DIP switch that allows you to toggle the communication paths between the USB port, the ATmega328P, and the ESP8266. It uses the reliable CH340G USB-TTL converter for stable programming via Micro USB.

Key Features for Electrapac Customers

• Seamless IoT Integration: Run your main sensor logic on the ATmega328P and handle web requests/cloud data logging on the ESP8266 simultaneously.

• Expanded Flash: The 32Mb memory on the ESP8266 side allows for large web server files, OTA (Over-the-Air) updates, and complex data storage.

• Onboard DIP Switch Control: No more conflicting serial signals! Easily switch between:

  • USB to ATmega328P (Standard Uno mode)

  • USB to ESP8266 (Firmware/Sketch upload)

  • ATmega328P to ESP8266 (Serial communication between chips)

• Standard Uno Layout: Compatible with most standard Arduino Shields (though check for pin conflicts when using the Wi-Fi module).

• Built-in Wi-Fi Antenna: Features a high-gain PCB antenna for reliable wireless connectivity across your home or workshop.

  Primary Applications

  • Smart Home Hubs: Controlling 220V appliances via Wi-Fi while monitoring local sensors.

  • Web-Linked Weather Stations: Collecting data with the Uno and uploading it to ThingSpeak or Blynk.

  • Remote Controlled Robotics: Using a smartphone app to drive your Electrapac Robot Chassis over a Wi-Fi network.

  • Industrial Monitoring: Acting as a bridge between wired industrial sensors and a cloud-based dashboard.

  Why Shop at Electrapac?

  We source the Uno + WiFi R3 with high-tolerance voltage regulators to ensure the power-hungry ESP8266 chip doesn't cause resets during Wi-Fi transmission. At www.electrapac.com, we provide the advanced hardware that lets you build the "Internet of Things" without the clutter.