Uploading IoT Application From Command Line: Difference between revisions

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Revision as of 09:30, 6 June 2025

Upload Code to NodeMCU (ESP8266) Using CMD

Prerequisites

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

pip install esptool pyserial

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

Step 1: Compile the Sketch

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

Step 2: Find the COM Port

Plug in NodeMCU
Open Command Prompt and type:

mode

Look for a line like Status for device COM3:

Step 3: Flash the Code

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

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

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

Step 4: View Serial Output (Serial Monitor)

Open CMD and run:

python -m serial.tools.miniterm COM3 115200

To exit, press Ctrl + ]

Notes

Make sure the COM port matches the one detected
Close Arduino Serial Monitor before using miniterm
Ensure Serial.begin(115200) in your sketch matches the miniterm baud rate

@@ Line 1: / Line 1: @@
-== Deploy NodeMCU (ESP8266) Code via Command Line ==
+== Upload Code to NodeMCU (ESP8266) Using CMD ==
 === Prerequisites ===
-# Install Python: https://www.python.org/downloads
+# Install Python from https://www.python.org/downloads (Check "Add Python to PATH")
-# Install esptool:
+# Install required tools:
 <code>
-pip install esptool
+pip install esptool pyserial
 </code>
 # Install Arduino IDE: https://www.arduino.cc/en/software
-# (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 ===
+=== Step 1: Compile the Sketch ===
-# Open your sketch in Arduino IDE
+# Open the sketch in Arduino IDE
-# Go to: <code>Sketch → Export Compiled Binary</code>
+# Select board: <code>NodeMCU 1.0 (ESP-12E Module)</code> under Tools → Board
-# Find the <code>.bin</code> file in your sketch folder (e.g., <code>MySketch.ino.bin</code>)
+# Go to Sketch → Export Compiled Binary
+# A <code>.bin</code> file will be generated in the sketch folder
-=== Step 2: Identify COM Port ===
+=== Step 2: Find the COM Port ===
 # Plug in NodeMCU
-# Open Command Prompt and run:
+# Open Command Prompt and type:
 <code>
 mode
 </code>
-# Note your device COM port (e.g., <code>COM3</code>)
+# Look for a line like <code>Status for device COM3:</code>
-=== Step 3: Flash Firmware ===
+=== Step 3: Flash the Code ===
-# Navigate to your compiled sketch folder:
+# Open CMD and go to the folder where the .bin file is located:
 <code>
-cd "C:\Users\<YourName>\Documents\Arduino\MySketch"
+cd "C:\Users\YourName\Documents\Arduino\MySketch"
 </code>
-# Flash the firmware:
+# Upload the binary to NodeMCU:
 <code>
 python -m esptool --port COM3 --baud 115200 write_flash 0x00000 MySketch.ino.bin
 </code>
-=== Optional: Erase Flash Before Writing ===
+=== (Optional) Erase Flash Before Upload ===
 <code>
 python -m esptool --port COM3 erase_flash
 </code>
-=== Step 4: View Serial Monitor Output ===
+=== Step 4: View Serial Output (Serial Monitor) ===
-# Install pyserial (if not already):
+# Open CMD and run:
-<code>
-pip install pyserial
-</code>
-# View Serial Monitor:
 <code>
 python -m serial.tools.miniterm COM3 115200
 </code>
-# Press <code>Ctrl + ]</code> to exit
+# To exit, press <code>Ctrl + ]</code>
 === Notes ===
-* Ensure no other serial monitor (like Arduino IDE) is open when using miniterm.
+* Make sure the COM port matches the one detected
-* Make sure baud rate matches your <code>Serial.begin()</code> setting.
+* Close Arduino Serial Monitor before using miniterm
+* Ensure <code>Serial.begin(115200)</code> in your sketch matches the miniterm baud rate