LiquidCrystal lcd ( 1, 2, 4, 5, 6, 7) // Creates an LC object. Keypad myKeypad = Keypad( makeKeymap(keyMap), rowPins, colPins, ROWS, COLS) define the cymbols on the buttons of the keypads char keyMap = //Column pinouts of the keypad Voltage : DC 9-15V Sound : 90dB Total Size: 42 x 17mm/1.6' x 0.67' (DH) Perfect for motorcycle stand alarm, alarm clock or any project which you need a alarm buzzer for getting immediate attention.
Int distance, initialDistance, currentDistance, i īoolean activated = false // State of the alarm boolean isActivated īoolean enteredPassword // State of the entered password to stop the alarm boolean passChangeMode = false Ĭonst byte ROWS = 4 //four rows const byte COLS = 4 //four columns char keypressed Wired Plastic Shell Active Piezo Electronic Alarm Buzzer. # include // includes the LiquidCrystal Library # include # define buzzer 8 # define trigPin 9 # define echoPin 10 long duration Then we need to define the buzzer and the ultrasonic sensor’s pins, define some variables needed for the program, define the keys of the keypad, as well as create the two objects for the keypad and the LCD. So we need to include the standard LiquidCrystal library for the LCD and the Keypad library which needs to be additionally installed. And at the end of this article I will post the complete source code.
Next let’s see the Arduino code. As the code is a bit longer, for better understanding, I will post the source code of the program in sections with description for each section.
#ARDUINO PIEZO SIREN HOW TO#
So, for example, if we set the row 1 line low, and all column lines high, when we will press, for example, the button 3, due to the short between the two lines, the column 3 line will drop to low so in such a case we can register that the button 3 has been pressed.Īs for the other two components on this project, the ultrasonic sensor and the LCD display, you can check my previous detailed tutorials on how to connect and use them.
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