Uploading IoT Application From Command Line

Upload Code to NodeMCU (ESP8266) Using CMD

Prerequisites

1. Install Python from https://www.python.org/downloads (Check "Add Python to PATH")
2. Install required tools:

pip install esptool pyserial

1. Install Arduino IDE: https://www.arduino.cc/en/software

Step 1: Compile the Sketch

1. Open the sketch in Arduino IDE
2. Select board: NodeMCU 1.0 (ESP-12E Module) under Tools → Board
3. Go to Sketch → Export Compiled Binary
4. A .bin file will be generated in the sketch folder

Step 2: Find the COM Port

1. Plug in NodeMCU
2. Open Command Prompt and type: mode
3. Look for a line like Status for device COM3:

Step 3: Flash the Code

1. Open CMD and go to the folder where the .bin file is located:

cd "C:\Users\YourName\Documents\Arduino\MySketch"

1. Upload the binary to NodeMCU:

python -m esptool --port COM3 --baud 115200 write_flash 0x00000 MySketch.ino.bin

(Optional) Erase Flash Before Upload

python -m esptool --port COM3 erase_flash

Notes

• Make sure the COM port matches the one detected