5.4.19 Project 11 Morse Code Open the Door

Morse code, also known as Morse password, is an on-again, off-again signal code that expresses different letters, numbers, and punctuation marks in different sequences. Now we use it as our password gate.

The Morse code corresponds to the following characters:

1. Description

We use \ as the correct password. What’s more, there is a button library file OneButton, which is very simple to click, double click, long press and other functions. For Morse password, click is“.”, long press and release is “-”.

2. Test Code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C mylcd(0x27,16,2);
#include "OneButton.h"
// Setup a new OneButton on pin 16.
OneButton button1(16, true);
// Setup a new OneButton on pin 27.
OneButton button2(27, true);
#include <ESP32Servo.h>
Servo myservo;
int servoPin = 13;
String password = "";
String correct_p = "-.-";  //password

// setup code here, to run once:
void setup() {
  Serial.begin(115200);
  mylcd.init();
  mylcd.backlight();
  // link the button 1 functions.
  button1.attachClick(click1);
  button1.attachLongPressStop(longPressStop1);
  // link the button 2 functions.
  button2.attachClick(click2);
  button2.attachLongPressStop(longPressStop2);

    // Allow allocation of all timers
    ESP32PWM::allocateTimer(0);
    ESP32PWM::allocateTimer(1);
    ESP32PWM::allocateTimer(2);
    ESP32PWM::allocateTimer(3);
    myservo.setPeriodHertz(50);    // standard 50 hz servo
    myservo.attach(servoPin, 1000, 2000); // attaches the servo on pin 18 to the servo object
    // using default min/max of 1000us and 2000us
    // different servos may require different min/max settings
    // for an accurate 0 to 180 sweep

  mylcd.setCursor(0, 0);
  mylcd.print("Enter password");
}

void loop() {
  // keep watching the push buttons:
  button1.tick();
  button2.tick();
  delay(10);
}

// ----- button 1 callback functions
// This function will be called when the button1 was pressed 1 time (and no 2. button press followed).
void click1() {
  Serial.print(".");
  password = password + '.';
  mylcd.setCursor(0, 1);
  mylcd.print(password);
} // click1

// This function will be called once, when the button1 is released after beeing pressed for a long time.
void longPressStop1() {
  Serial.print("-");
  password = password + '-';
  mylcd.setCursor(0, 1);
  mylcd.print(password);
} // longPressStop1

// ... and the same for button 2:
void click2() {
  Serial.println(password);
  if(password == correct_p)
  {
    myservo.write(180);  //open the door if the password correct
    mylcd.clear();
    mylcd.setCursor(0, 0);
    mylcd.print("open");
  }
  else
  {
    mylcd.clear();
    mylcd.setCursor(0, 0);
    mylcd.print("error");
    delay(2000);
    mylcd.clear();
    mylcd.setCursor(0, 0);
    mylcd.print("input again");
  }
  password = "";
} // click2

void longPressStop2() {
  //Serial.println("Button 2 longPress stop");
   myservo.write(0);  //open door
   mylcd.clear();
   mylcd.setCursor(0, 0);
   mylcd.print("close");
} // longPressStop2

3. Test Result

At first, the LCD1602 displays “Enter password”, then click or long press button 1 to tap the password. If we input the correct password “-.-”, then click button 2, the door will open, and the LCD1602 will display “open”.

If other incorrect passwords are entered, the door will not move, the LCD1602 will display “error” and then “enter again” 2s later. Furthermore, long press button 2 can close the door.