🚦 ESP8266 Push Button LED Toggle using Interrupt (MicroPython)

This project demonstrates how to use external interrupts on the ESP8266 to toggle an LED using a push button.
Instead of continuously checking button state, the program reacts instantly when the button is pressed — making it more efficient and responsive.

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🧠 Project Overview

Component	Description
Board	ESP8266
IDE	Thonny IDE
Language	MicroPython
USB Driver	Silicon Labs CP210x USB to UART Bridge
LED Pin	GPIO2
Button Pin	GPIO0 (Active LOW)

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⚙️ Requirements

• ESP8266 (NodeMCU or compatible)
• 1 LED + 220Ω resistor
• 1 Push Button
• Micro USB cable
• Thonny IDE
• CP210x USB Driver
• MicroPython firmware installed on ESP8266

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🧩 Circuit Connections

ESP8266 Pin	Component	Description
GPIO2	LED	Output (Active LOW)
GPIO0	Push Button	Input (Active LOW)
GND	LED (-) and Button GND	Common Ground

💡 Tip: Use a pull-up resistor or internal pull-up on GPIO0 to prevent floating input issues.

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💻 Code

import machine

# GPIO2 = one LED connected
# GPIO0 = pushbutton

led = machine.Pin(2, machine.Pin.OUT)
button = machine.Pin(0, machine.Pin.IN)

def button_function(pin):
    led.value(not led.value())  # Toggle LED state

button.irq(trigger=machine.Pin.IRQ_FALLING, handler=button_function)