LED does not blink - Arduino UNO+WiFi R3 ATmega328P+ESP8266 board

Question

As I am learning the Arduino coding, I want to see if my program can turn on the LED light. I have tried all the things, but the code does not start the LED light I have installed on the board.

The code compiles successfully and upload on the board, but nothings happens after that. See the output logs as below:

See all the configuration of board as below:

The board I have: UNO+WiFi R3 ATmega328P+ESP8266 CH340G Board compatible with Arduino

https://robocraze.com/uno-wifi-r3-atmega328p-esp8266-ch340g-board-compatible-with-arduino

Board switch settings:

5,6,7 => ON (to upload the code from Arduino IDE)

Yellow LED installed:

13 => Positive, GND => Negative

Board setup:

Arduino IDE Setup:

Program:

void setup()
{
  pinMode(13, OUTPUT);
}

void loop()
{
  digitalWrite(13, HIGH);
  delay(2000);
  digitalWrite(13, LOW);
  delay(2000);
}

Output logs after uploading the code:

esptool.py v2.8
Serial port COM8
Connecting....
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: ec:fa:bc:3e:2e:6f
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Flash params set to 0x0340
Compressed 261472 bytes to 193134...
Wrote 261472 bytes (193134 compressed) at 0x00000000 in 17.1 seconds (effective 122.1 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

As you can see, the last message is Hard resetting via RTS pin....

Would anyone please tell me what is happening here? Why the program does not start the LED light even after everything looks fine?

Any help would be greatly appreciated.

Thanks.

Answer 1

The Uno+WiFi board is an Uno. With DIP switches 3 and 4 in ON position it is a normal Arduino Uno clone with CH340 chip for USB. All the pin headers at board sides and the ICSP pins are as on an Arduino Uno. Every sketch for Uno will work.

The esp8266 is added for WiFi functionality. The DIP switches allow to program the esp8266 over the CH340 or to connect the esp8226 to Serial of the Uno part (ATmega328p).

To have Serial free for USB, it is usual to wire the esp8266 to a common Uno on some other pair of pins then RX/TX and use SoftwareSerial. There is no such connection on this Uno+WiFi, but the esp8266 header has the Rx/RX pins of the esp8266 so it is possible to wire SoftwareSerial pins with jumper wires (power and ground are connected on board of course).

Don't switch the DIP switches too frequently. They are not made for it and fall apart. Upload some permanent firmware to esp8266 or use OTA upload for esp8266.