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This document describes a smart door knocker device that uses an Arduino, piezoelectric sensor, servo motor, and other components. The piezoelectric sensor detects knock signals which are processed by the Arduino microcontroller. The microcontroller then actuates the servo motor to unlock the door if the knock signal matches a programmed pattern, allowing authorized users to enter. The document outlines the components, wiring diagrams, programming process, and some troubleshooting for the smart door knocker system.
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- 1. Instrumentation: Smart Door Knocker Authorized by: Berlin Richad Simanjuntak Dinda Eka Pratiwi Rifqi Nugraha 2A-Refrigeration and Air Conditioning Polytechnic State of Bandung
- 2. Source: http://www.instructables.com/id/Secret-Knock-Detecting- Door-Lock/ with title: Secret Knock Detecting Door Lock
- 3. The Equipments 1. Arduino UNO R3 2. Servo 3. LED 4. Resistors 5. Buzzer 6. Piezoelectric 7. Push Button 8. Cable for jumper 9. Protoboard 10. PCB
- 6. Process Piezoelectric receive a knock signal The Signal received by microcontroller The microcontroller processed the actuator
- 8. If we want to control the arduino, we must input the program by using software Arduino IDE. First we should adapt the COM of the Arduino with our software. Then, we should choose the same board between the Arduino and the software (example: Board Arduino Genuino Uno, COM 11).
- 9. The trouble when making “Smart Door Knocker” 1. To adjust the signal input into the piezoelectric in order to compare with frequency of a knock. 2. The function of push button sometimes didn’t work.
- 10. For more info, visit: