Adding an LCD Screen to the Arduino Keyer with Straight Key Port

The addition of a LCD Screen and rotary encoder gives us the capability to adjust the words per minute. The LCD screen has a I2C module to help reduce wiring. This module has been used in past projects and works well. The library used is in the links at the bottom of the post.

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Since the rotary encoder used in this project has resistors installed on the break out board, I did not have to worry about installing any. If you use an encoder that is not mounted to a break out board, it will require resistors to be installed. Most rotary encoders also have a push button. This project did not require one but it may be used in the future.

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Arduino Keyer Sketch

//Arduino Keyer with Straight Key 9/28/19
//LCD and Rotary encoder added 9/29/19
//https://MacarrLabs.com/
//https://KM4NMP.com/
//common plug pinouts are:
//  Tip – left lever, or left side of single lever, normally Dot
//  Ring – right lever, or right side of single lever, normally Dash
//  Shaft – common
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Rotary.h>


int LeftPin = 2;                         //left paddle push pin
int RightPin = 3;                        //right paddle push pin
int Straightkey = 6;                     //Straight key pin
int LeftPinState = 0;                    //left paddle pin state
int RightPinState = 0;                   //right paddle pin state
int StraightkeyState = 0;                //Straight key pin state
int audio = 12;                          //audio out pin
int note = 600;                          //note pitch change for a different tone
float dotTime;
float dotTimeSec;
float dashTime;
int wpm = 15;
float CharPerMin;
int buttonNeg = 5;                       //ground connection for paddle and straight key
int buttonPlus = 4;                      // + connection for paddle
int StraightkeyPlus = 7;                 // + connection for straight key



LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address
Rotary r = Rotary(9, 8);                //set pins for rotary encoder


void setup() {
  Serial.begin(9600);                   //for debugging
  lcd.begin(16,2);
  r.begin(true);

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 pinMode(buttonNeg, OUTPUT);
  pinMode(buttonPlus, OUTPUT);
  pinMode(StraightkeyPlus, OUTPUT);
  digitalWrite(buttonNeg, LOW);
  digitalWrite(buttonPlus, HIGH);
  digitalWrite(StraightkeyPlus, HIGH);
  pinMode(LeftPin, INPUT);            //set pin as input
  pinMode(RightPin, INPUT);           //set pin as input
  pinMode(Straightkey, INPUT);        //set pin as input
  
  lcd.setCursor( 0, 0 );                   
  lcd.print("KM4NMP.COM Keyer");
  lcd.setCursor( 11, 1 );
  lcd.print(wpm);
  lcd.print("WPM");
  delay(2000); 
}
 
void loop() {
  LeftPinState = digitalRead(LeftPin);
  RightPinState = digitalRead(RightPin);
  StraightkeyState = digitalRead(Straightkey);

  unsigned char result = r.process();   //check Rotary encoder for change
  if (result) {
    Serial.println(result == DIR_CW ? "Right Turn" : "Left Turn");  //for debugging
    if (result == DIR_CW) {
      wpm = wpm + 1;
    }
    if (wpm > 35) {
      wpm = 35;
    }
    if (result == DIR_CCW) {
      wpm = wpm - 1;
    }
    if (wpm < 10) {
      wpm = 10;
    }

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Serial.print(wpm);             //for debugging
    Serial.println("WPM");         //for debugging
    lcd.setCursor( 11, 1 );        //set lcd cursor
    lcd.print(wpm);                //print words per minute on LCD
  }

 //calculate dot time
  CharPerMin = wpm * 50;
  dotTimeSec = 60 / CharPerMin;    //dot time in seconds
  dotTime = dotTimeSec * 1000;     //dot time in milliseconds
  dashTime = dotTime * 3;          //dash time
  
  if ( StraightkeyState == 1) {
    Serial.print("Straight Key active ");         //for debugging
    Serial.println(StraightkeyState);             //for debugging   
    tone(audio, note);               
  }

  if ( StraightkeyState == 0) {
     noTone(audio);               
  }
 
  if (LeftPinState == 1) {
    Serial.print("left paddle ");   //for debugging
    Serial.println(LeftPinState);   //for debugging
    tone(audio, note);              //start tone
    delay(dotTime);                 //tone length
    noTone(audio);
    delay(dotTime);                 //time between tones
  }
 
  if (RightPinState == 1) {
    Serial.print("Right paddle ");  //for debugging    
    Serial.println(RightPinState);  //for debugging
    tone(audio, note);              //start tone
    delay(dashTime);                //tone length
    noTone(audio);
    delay(dotTime);                 //time between tones
  } 
  
}

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