Uploading IoT Application From Command Line

Deploy NodeMCU (ESP8266) Code via Command Line

Prerequisites

1. Install Python: https://www.python.org/downloads
2. Install esptool:

pip install esptool

1. Install Arduino IDE: https://www.arduino.cc/en/software
2. (Optional) Install USB-to-Serial Drivers:

• CH340: https://sparks.gogo.co.nz/ch340.html
• CP210x: https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers

Step 1: Compile Code

1. Open your sketch in Arduino IDE
2. Go to: Sketch → Export Compiled Binary
3. Find the .bin file in your sketch folder (e.g., MySketch.ino.bin)

Step 2: Identify COM Port

1. Plug in NodeMCU
2. Open Command Prompt and run:

mode

1. Note your device COM port (e.g., COM3)

Step 3: Flash Firmware

1. Navigate to your compiled sketch folder:

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

1. Flash the firmware:

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

Optional: Erase Flash Before Writing

python -m esptool --port COM3 erase_flash

Step 4: View Serial Monitor Output

1. Install pyserial (if not already):

pip install pyserial

1. View Serial Monitor:

python -m serial.tools.miniterm COM3 115200

1. Press Ctrl + ] to exit

Notes

• Ensure no other serial monitor (like Arduino IDE) is open when using miniterm.
• Make sure baud rate matches your Serial.begin() setting.