How to Make A Automatic Door bell System

In this article you will know that you can make automatic door alert alarm for your home.

Components Needed.

You will need the following materials:

• Buzzer - https://amzn.to/3hG4LgZ

• 10k resistor - https://amzn.to/2VOPzGA

• BC 547 transistor - https://amzn.to/2VPUF5s

• Reed Switch - https://amzn.to/3EksL2Z

• 9v Battery - https://amzn.to/3Co5onn

• Battery Cap - https://amzn.to/3zgc58X

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