How to Program ESP8266 with Arduino UNO

Here, learn how to Program ESP8266 with Arduino Board. You just need to install the ESP8266 board and make the circuit as per the below-given instructions. For basics and features of ESP8266 click here. We are using Blink LED program as a sample program.

Step 1: Required Components

ESP8266 Module x 1
Arduino UNO Board x 1
3.3V Linear Voltage Regulator (LD1117) x 1
Breadboard x 1
Jumper Wires
LED (for Blink LED Program)

Step 2: Installing Board to Arduino IDE

First, install ESP8266 to Arduino IDE. If you have already installed the board to boards manager of Arduino IDE, skip this step else follow the steps

  1. Start the Arduino IDE
  2. Go to File > Preferences
  3. Add the below-given link to Additional Boards Manager URLs
  4. Go to Tools > Boards > Boards Manager…
  5. Search ESP8266ESP8266 in Arduino Boards Manager
  6. Click Install button to install the ESP8266 Board
  7. Now close the Boards Manager window and select the Generic ESP8266 Module from board selection listSelection of ESP8266 as board in Arduino IDE
  8. Installation of ESP8266 in Arduino IDE is done.

Step 3: Circuit Time

Make a circuit as per the given diagram. Connect the CH_PD and VCC line to Voltage Regulator Output, GND and GPIO_0 to Ground. Also, connect RX and TX lines of both. GPIO_0 is Grounded to enable the programming mode of ESP8266.

Circuit Diagram of Programing ESP8266 with Arduino

Step 4: Program ESP8266 using Arduino

Make the circuit as per the above-given diagram. Power up the Arduino UNO board and wait till the Arduino Board boots up successful. (It will take around 5 seconds) Connect the Arduino Reset pin to Ground. Reset pin is grounded to bypass the Arduino. It will disable Arduino Board and upload code directly to the ESP8266. Sample program for Blink LED is as below

After the Arduino IDE shows done uploading of Blink LED program, connect the LED to GPIO_2 Pin of ESP8266. Please do not connect the LED before or at the time of uploading program, it can cause some issue in uploading program.

Note: If the L light is on at the time of before uploading program, disconnect the power supply for one minute, else it will show error in uploading the program to ESP8266.

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