Week 8 - Journal

This week's assignment is to communicate wirelessly with a smart circuit via a Graphical User Interface (GUI) on phone or PC. I decided to make a Smart Door Lock. The cirucit controls a motor to lock and unlock door along with status notifier (buzzer). This idea supports the concept of wireless serial communication & making things talk to things.

Circuit design:

• Link for circuit: Here

• On Fritzing, I started to put the components I will use in my circuit. The circuit contains two action components, Buzzer and Servo. Also, and input component which is bluetooth to send data to arduino.

• I wired the 5V and GND from Arduino to breadboard. 

• I connected the buzzer on analog output pin 11 with +ve terminal and GND with -ve terminal.

• I connected the Servo on analog output pin 10 for signal and powered it using the rails.

• Finally, the bluetooth module is connected from RX (blue.) to TX (arduino) and TX (blue.) to RX (arduino) and powered it form breadboard .

Code & logic:

• I started first by dividing the problem and defining the objectives clearly and what I want to achieve.

• I declared a variable for buzzer and another one for incoming data to store input.

• In setup function, I wrote the pinMode for buzzer attached the servo to its pin (3). I also started the serial to test with with and set servo intially to angle 0 degree. 

• In loop funciton, I checked first if there is input with (.available) funciton.

• I took the input from user using (.read) function. 

• Then there is three cases. if input is "1" the servo moves and buzzer makes one beep. (open door)

• The other case is if input is "2" the servo goes bake and makes two beeps. (close door)

• The last case if anything else is input, the program says "Invalid Input".