Arduino UNO R3 with Wi-Fi ATmega328P + ESP8266 NodeMCU

The Arduino UNO R3 with Wi-Fi ATmega328P + ESP8266 NodeMCU is a development board that combines the standard ATmega328P chip with nodemcu esp8266 WiFi module on a single Arduino UNO R3 form factor PCB. The ATmega328P handles the main Arduino sketch execution at 16MHz while the ESP8266 manages WiFi communication independently — allowing the arduino uno r3 to connect to networks, serve web pages, send HTTP requests, and publish MQTT data without any separate shield or module purchase.

The arduino uno wifi board operates on 3.3V to 5V and draws up to 800mA total — most of which is consumed by the ESP8266 during WiFi transmission bursts. One practical setup note: the ATmega328P and ESP8266 communicate via serial on this board. The Arduino sketch sends AT commands to the over the hardware UART, meaning the hardware serial port is shared between WiFi communication and USB debug output. Using SoftwareSerial for debug output frees the hardware UART for communication during active WiFi sessions. One trade-off: the 800mA peak current demand requires a power supply capable of delivering this — USB 2.0 ports rated at 500mA may cause instability under peak WiFi load.

The advantage of this integrated ATmega328P + ESP8266 layout over pairing separate boards is that the ESP8266 firmware can be updated directly from the Arduino IDE using the onboard USB connection. The nodemcu esp8266 and arduino based projects community in India uses this board for smart home sensors, WiFi relay controllers, and cloud-connected data loggers. Available from StemVolt, this board is suitable for engineers working on WiFi IoT applications and practical connected electronics projects.

Related Products:

• Explore The Arduino Uno R3 CH340G ATmega328P Compatible Board

• Checkout The NodeMCU ESP8266 Serial Port Baseboard Board for Arduino projects

Features:

• Dual MCU design runs ATmega328P Arduino and ESP8266 WiFi simultaneously
• ESP8266 NodeMCU handles WiFi without requiring any separate shield purchase
• 16MHz ATmega328P executes standard Arduino sketches and libraries fully
• Micro USB port powers and programs both MCUs from single cable
• 3.3V to 5V operation compatible with standard Arduino sensor modules

Technical Specifications:

 Applications:

• Arduino UNO R3 WiFi board used for smart home sensor WiFi project
• College IoT project uses arduino uno wifi board as cloud data logger
• WiFi relay controller uses ATmega328P chip with nodemcu esp8266 for switching
• Weather station project uses arduino uno r3 for sensor WiFi dashboard
• Arduino based projects use development board for ESP8266

Package Includes:

• 1 x Arduino UNO R3 with Wi-Fi ATmega328P + ESP8266 NodeMCU