Instrumentation:Smart Door KnockerAuthorized by:

Berlin Richad SimanjuntakDinda Eka PratiwiRifqi Nugraha

2A-Refrigeration and Air Conditioning

Polytechnic State of Bandung

Source:http://www.instructables.com/id/Secret-Knock-Detecting-Door-Lock/

with title:Secret Knock Detecting Door Lock

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

Original Wiring

Wiring with Modification

Process

Piezoelectric receive a knock

signal

The Signal received by

microcontroller

The microcontroller processed the

actuator

Software and Program

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).

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.

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