This is a Door Alarm System Project made using aurdino And reed Switch with the help of IOT.

Below are the schematics provided for the code above.

• Arduino uno
• Magnetic Contact Switch - Door Sensor
• Buzzer
• Breadboard and some cable

• Since the switch is non polar, you can plug in the wires any way.
• Connect one wire of the switch to a jumper wire and plug the jumper wire pin to pin GND on the POWER side of the Arduino
• Connect the other switch wire to another jumper wire, and plug that jumper wire into pin 4 of the Arduino.