#include <TM1638.h>
// Wemos D1 Mini = Data:D2,Clock:D5,Strobe:D6
TM1638 module(4, 14, 12);
const char alpha[] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'x', 'y', 'z'};
int pos = 8;
//Demo how you can define place of dot
//Dot will move from left to right and index number for the place will be shown.
void scrollDots() {
  for (int i = 0; i < 8; i++)
  {
    module.clearDisplay();
    //Move dot one place to right
    module.setDisplayToDecNumber(i, 128 >> i);
    delay(1000);
  }
  delay(2000);
}
//Scroll all alphabets
void scrollAlpha() {
  String  s = "";
  for (int i = 0; i < 26; i++)
  {
    module.clearDisplay();
    //When we have 8 characters on display, start to scroll them.
    if (i > 8) {
      s.remove(0, 1);
    }
    s = s + alpha[i];
    module.setDisplayToString(s);
    delay(1000);
  }
  delay(2000);
}
void setup() {
  Serial.begin(9600);
  /** Set the display (segments and LEDs) active or off and intensity (range from 0-7). */
  module.setupDisplay(true, 0);
  scrollDots();
  scrollAlpha();
  module.clearDisplay();
}

//Move leds with first and second button
void loop() {
  byte keys = module.getButtons();
  int a = keys;
  delay(100);
  switch (keys) {
    case 1 :
      pos = pos >> 1;
      break;
    case 2 :
      pos = pos << 1;
      break;
      //Other keys are cases 4,8,16,32,64,128
      //If you need to check if second and third buttons are bot pressed, make case for (2+4)=6
  }
  //Dont let red dot escape from the playground
  if (pos > 128) pos = 1;
  if (pos < 1) pos = 128;
  module.setLEDs(pos);
}