1  // SPDX-FileCopyrightText: 2018 John Edgar Park for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  // For Adafruit_AMRadio library -- Morse code transmits on AM 540.
 6  // Connect antenna (40" wire) to pin A0 and GND
 7  // RANGE IS LIMITED TO A FEW FEET
 8  // Morse "dot" key is a contact switch connected to D2 and GND
 9  // "Dash" key is switch connected to D0 and GND
10  // Adapted from Phil Burgess's AMRadio sketch
11  
12  #include <Adafruit_AMRadio.h>
13  
14  Adafruit_AMRadio radio;
15  
16  const int buttonDotPin = 2; //pushbutton pin for dit
17  const int buttonDashPin = 0; //pushbutton pin for dah
18  const int ledPin = 13; //to light the onboard LED
19  
20  int buttonDotState = 0; //to store button state
21  int buttonDashState = 0;
22  
23  //Morse varaiblas
24  const int PITCH = 680;
25  const int DOT = 100; //duration of short dot in millis
26  const int DASH = DOT * 3;
27  const int GAP = DOT;
28  
29  
30  void setup() {
31    pinMode(ledPin, OUTPUT);
32    pinMode(buttonDotPin, INPUT_PULLUP);
33    pinMode(buttonDashPin, INPUT_PULLUP);
34  
35    radio.begin(540000); //start radio object, transmits at 540MHz AM
36  }  
37  
38  
39  void loop() {
40    buttonDotState = digitalRead(buttonDotPin);
41    buttonDashState = digitalRead(buttonDashPin);
42    
43    if (buttonDotState == HIGH) {    // not pressed
44      digitalWrite(ledPin, LOW);   // light is off
45    }
46    else {                        // pressed
47      digitalWrite(ledPin, HIGH);  // light on
48      radio.tone(PITCH, DOT);
49      delay(GAP);
50    }
51    if (buttonDashState == HIGH) {    // not pressed
52      digitalWrite(ledPin, LOW);   // light is off
53    }
54    else {                        // pressed
55      digitalWrite(ledPin, HIGH);  // light on
56      radio.tone(PITCH, DASH);
57      delay(GAP);
58    }
59    
60    delay(15);
61  }