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Uno R3 development board with Wifi ESP8266, compatible with Arduino
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Arduino compatible development board, UNO R3 with Wifi ESP8266 and CH340 driver. This development board integrates the ATmega328p microcontroller with ESP8266 which brings a 32Mb flash memory.
The board allows the control of different components with the CH340 driver by selecting the operating mode from the switches present on the board (see table below).
Specifications:
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 the Uno R3
Output voltage: 3.3V and 5V through AMS1117
Maximum current per I/O pin: 40mA (recommended 20mA)
Oscillator frequency: 16MHz
UNO flash memory: 32KB (0.5 used by the 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 | OFF | OFF | OFF | MR | MR | MR | Nous |
CH340 connect to ESP8266 (connect) | OFF | OFF | OFF | OFF | MR | MR | OFF | Nous |
CH340 connect to ATmega328 (upload sketch) | OFF | OFF | MR | MR | OFF | OFF | OFF | Nous |
Mega328+ESP8266 | MR | MR | OFF | OFF | OFF | OFF | OFF | Nous |
All modules work independently | OFF | OFF | OFF | OFF | OFF | OFF | OFF | Nous |
Pinouts:
Instructions:
To load the code in the Atmega328p, it is necessary to follow the following 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 related to the board.
4. Click on UPLOAD and, importantly , at the exact moment when the upload starts, quickly press the Red button for RESET, otherwise you may receive an error.
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