ESP8266 Reed Switch Module Project

This project demonstrates how to use a reed switch module with an ESP8266 microcontroller. A reed switch is a magnetic sensor that activates in the presence of a magnetic field. When the switch state changes (open or closed), the ESP8266 detects it using an interrupt and prints the state to the Serial Monitor.

Components Needed

Circuit Diagram

Circuit Setup

1.Connecting the Reed Switch Module to ESP8266:

Connect one terminal of the reed switch module to GPIO pin D2 on the ESP8266.

Connect the other terminal of the reed switch module to ground (GND) on the ESP8266.

Use the internal pull-up resistor of the ESP8266 by setting the pin mode to INPUT_PULLUP for stable readings.

Instructions

1.Setup:

Initialize serial communication at a baud rate of 9600.

Set the reed switch pin as an input with the internal pull-up resistor enabled.

Attach an interrupt to the reed switch pin using attachInterrupt() function to monitor state changes.

2.operation:

When the state of the reed switch changes (open or closed), the handleInterrupt() function is triggered.

Inside handleInterrupt(), read the state of the reed switch pin (LOW for closed, HIGH for open).

Print the current state ("Reed switch closed" or "Reed switch open") to the Serial Monitor.

Applications

Security Systems: Detect opening/closing of doors or windows.

automation: Trigger actions based on the state of the reed switch.

monitoring: Monitor the status of devices or access points.

Notes

interrupts: Use interrupts to handle immediate state changes without polling continuously.

Pull-up Resistor: Ensures the pin reads a stable state when the reed switch is open.

Serial Output: Adjust the baud rate (Serial.begin()) as needed for optimal communication with the Serial Monitor.