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![(PDF) Password Based Door Lock System Using Arduino](https://i2.wp.com/i1.rgstatic.net/publication/330998913_Password_Based_Door_Lock_System_Using_Arduino/links/5c6040aea6fdccb608b63820/largepreview.png)
![Arduino and Android Based Password Protected Door Lock - Hackster.io](https://i2.wp.com/hacksterio.s3.amazonaws.com/uploads/attachments/396211/schematic_NV41WnRFqM.png)
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![Arduino and Android Based Password Protected Door Lock - Hackster.io](https://i2.wp.com/hackster.imgix.net/uploads/attachments/396222/door-lock_o6ZNXxlp3O.jpg?auto=compress&w=1600&h=1200&fit=min&fm=jpg)