# Uno R3 development board with Wifi ESP8266, Arduino compatible

- Page: https://sigmanortec.ro/en/uno-r3-development-board-with-wifi-esp8266-arduino-compatible
- Price: 49.91 RON
- Availability: In stock; 1-2 zile
- Reference: 33500 · EAN: 5948351975422
- Category: Mechatronics and IoT > Development Board > Arduino Compatible Boards
- Package (shipping data): 0.023 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 04:49 (Europe/Bucharest)

## Description

The Arduino compatible development board combines ATmega328p with ESP8266 Wifi module for IoT and automation projects, offers stable USB connection via CH340 for fast programming, includes switches for easy selection of working mode between microcontroller and Wifi, keeps the standard Uno R3 pinout with 14 digital and 6 analog pins, provides 3.3V and 5V outputs.
Arduino compatible development board, UNO R3 with Wifi ESP8266 and CH340 driver. This development board integrates the ATmega328p microcontroller with ESP8266 which provides a 32Mb flash memory.
The board allows control of various components with the CH340 driver by selecting the operating mode from the switches present on the board (see table below).
Specifications:
Power supply voltage: 6 - 9VDC
Microcontroller: ATmega328p
Wifi: ESP8266
USB Driver: CH340G
Digital I/O pins: 14
Analog I/O pins: 6
Pinout: the one used on Uno R3
Output Voltage: 3.3V and 5V via AMS1117
Maximum current per I/O pin: 40mA (recommended 20mA)
Oscillator frequency: 16MHz
UNO flash memory: 32KB (0.5 used by bootloader)
SRAM: 2KB
EEPROM: 1KB
Switch status and mode selection:
1
2
3
4
5
6
7
8
CH340 connect to ESP8266 (upload sketch)
OFF
ON
NoUSE
CH340 connect to ESP8266 (connect)
OFF
ON
OFF
NoUSE
CH340 connect to ATmega328 (upload sketch)
OFF
ON
OFF
NoUSE
Mega328+ESP8266
ON
OFF
NoUSE
All modules work independent
OFF
NoUSE
Pinout:
Instructions:
To upload the code to Atmega328p, you need to follow these steps:
1. Set all switches to OFF.
2. Set only switches 3 and 4 to ON.
3. Select the UNO R3 board and the COM port corresponding to the board.
4. Click UPLOAD and, important, at the exact moment the upload starts, quickly press the Red RESET button, otherwise you may get an error.