Description
The WiFi R3 ATmega2560 + ESP8266 USB-TTL Board is a powerhouse for makers in Rwanda who need maximum I/O pins combined with wireless capability. Instead of stacking a Wi-Fi shield on top of a bulky Mega 2560, this board builds both the ATmega2560 and the ESP8266 chips directly onto one compact PCB. This “Mega + WiFi” hybrid is perfect for complex home automation systems, robotic controls, and data logging servers.
Two Chips, One Board
The genius of the WiFi R3 ATmega2560 lies in its flexibility. It gives you the full 54 digital I/O pins and 16 analog inputs of the standard Mega 2560, plus the Wi-Fi power of the ESP8266 (ESP-12E/F style).
- Memory Upgrade: Unlike standard ESP modules with 4Mb or 8Mb, this board often features 32Mb (megabits) of flash memory on the ESP8266 side, allowing for larger file storage and complex web pages.
- USB Driver: It uses the reliable CH340G USB-to-TTL converter to handle communication between your computer and the chips.
Specifications
| Product | WIfi + NodeMCU |
| Microcontroller | ATmega2560 |
| IC Wi-Fi | ESP8266 |
| USB TTL Converter | CH340G |
| Power Input | 5V (500mA) |
| Power input MAX | 9-24V |
| USB | MIcro USB |
| Clock Frequencty | 16MHz |
| Digital I/O Pins | 54 |
| Analog I/O Pins | 16 |
| memory Size | 256KB |
| RAM | 8KB |
| ROM | 4KB |
| Interface Type | SerialIOTA |
| Operating Temperature | -40 To +120 |
Mastering the DIP Switches
Using the WiFi R3 ATmega2560 requires understanding the onboard 8-position DIP switch. These switches determine which chip you are “talking” to via USB or how the chips talk to each other.
- Program Mega 2560: Turn switches 3 and 4 ON. (Connects USB to ATmega2560).
- Program ESP8266: Turn switches 5, 6, and 7 ON. (Connects USB to ESP8266).
- Mega + ESP Communication: Turn switches 1 and 2 ON. (Connects ATmega2560 Serial3 to ESP8266).
| Connection |
DIP |
||||||
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
| ATmega2560ESP8266 |
ON |
ON |
OFF |
OFF |
OFF |
OFF |
OFF |
| USB ATmega2560 |
OFF |
OFF |
ON |
ON |
OFF |
OFF |
OFF |
| USBESP8266 (Update firmware or sketch) |
OFF |
OFF |
OFF |
OFF |
ON |
ON |
ON |
| USBESP8266 (communication) |
OFF |
OFF |
OFF |
OFF |
ON |
ON |
OFF |
| All independent |
OFF |
OFF |
OFF |
OFF |
OFF |
OFF |
OFF |
Special solution
USB ATmega328 ESP8266
|
DIP |
SWITH 2 |
|||||||
| Connection |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
| USB ATmega2560 ESP8266 |
ON |
ON |
ON |
ON |
OFF |
OFF |
OFF |
To RXD3/TXD3 |
- USB converter CH340G connect to RX0/TX0 of ATmega2560
- ESP8266 connect to RX3/TX3 of ATmega2560
Package Includes: 1 x Mega +WiFi R3 Atmega2560 + NodeMCU ESP8266 32Mb Memory USB-TTL CH340G Compatible For Arduino Mega
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