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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