NodeMCU_ESP32

Step 1: Setup Connection

Set the Port (Check the bottom right corner of Thonny to ensure it says "MicroPython (ESP32)" and the correct COM port is selected.)

Step 2: The Blink Code

Copy and paste the code into Thonny
Run the program (Click the green arrow button).

from machine import Pin

import time

# 1. Setup the built-in LED (GPIO 2) as an Output

# On most ESP32 boards, the blue LED is on Pin 2

led = Pin(2, Pin.OUT)

print("Blinking started! Look at your NodeMCU board.")

while True:

led.value(1) # Turn LED ON

print("LED ON")

time.sleep(0.5) # Wait 0.5 seconds

led.value(0) # Turn LED OFF

print("LED OFF")

time.sleep(0.5) # Wait 0.5 seconds

Step 3: Program the Device

Copy and paste the code into the editor.
Modify the number (Change student_id to your seat number).
Run the program (Click the green arrow button).

import network

import socket

from machine import Pin

import time # Import time for safety delays

import gc # Import garbage collection for stability

# ======================================================

# [ STUDENT SECTION: CHANGE YOUR ID BELOW ]

# ======================================================

student_id = "01" # <--- Change this to your seat number

# ======================================================

# --- SAFETY BUFFER (VERY IMPORTANT!) ---

# After saving as main.py, this gives you 3 seconds to press

# "Stop" in Thonny before the loop starts. Prevents lock-outs.

print("System booting in 3 seconds...")

time.sleep(3)

# 1. Define Onboard LED Pin (GPIO 2 for NodeMCU)

led = Pin(2, Pin.OUT)

# 2. Wi-Fi Access Point (AP) Configuration

wifi_name = "SmartLight_ID_" + student_id

wifi_password = "password123"

ap = network.WLAN(network.AP_IF)

ap.active(False) # Reset Wi-Fi state

time.sleep(0.5)

ap.config(essid=wifi_name, password=wifi_password)

ap.active(True)

# Wait for Wi-Fi module to be ready

while not ap.active():

pass

print("-" * 30)

print("IoT Station Started!")

print("Wi-Fi SSID: " + wifi_name)

print("Server URL: http://192.168.4.1")

print("-" * 30)

# 3. Web Interface Design (HTML)

def web_page():

html = """<html><head><meta charset="utf-8">

<style>

body { font-family: Arial, sans-serif; text-align: center; background-color: #f4f4f4; padding-top: 50px; }

.button { display: block; width: 80%; padding: 40px; font-size: 30px;

margin: 20px auto; color: white; border: none; cursor: pointer;

border-radius: 15px; text-decoration: none; font-weight: bold; }

.on { background-color: #3498db; }

.off { background-color: #34495e; }

h1 { color: #2c3e50; }

</style></head>

<body>

<h1>IoT Station #""" + student_id + """</h1>

<p>Control the Onboard Blue LED</p>

<hr>

</body></html>"""

return html

# 4. Initialize Server Socket

gc.collect() # Clear memory before starting

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# FIX: Allow port reuse to prevent "Address in use" errors after Reset

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

s.bind(('', 80))

s.listen(5)

while True:

try:

# Clear memory at the start of each loop for stability

gc.collect()

conn, addr = s.accept()

# Set a timeout so a bad connection doesn't hang the whole system

conn.settimeout(3.0)

print("Got a connection from %s" % str(addr))

request = conn.recv(1024).decode()

# Handle the URL commands

if '/on' in request:

led.on()

elif '/off' in request:

led.off()

# Generate and send the HTTP response

response = web_page()

conn.send('HTTP/1.1 200 OK\nContent-Type: text/html\n\n' + response)

conn.close()

except Exception as e:

# Print error to Shell and ensure connection is closed

print("Connection Error:", e)

if 'conn' in locals():

conn.close()

Step 4: Connect with Your Phone

Turn off Mobile Data (4G/5G). This is important to prevent the phone from switching away from the NodeMCU Wi-Fi.
Connect to Wi-Fi: Find your SSID (e.g., SmartLight_ID_01) and connect.
Open your Browser (Chrome, Safari, etc.).
Go to 192.168.4.1 to see your control panel.