// Create code Programming C++ Setup control Arduino UNO R3 
// TM1637 config 7segment

#include <TM1637.h>

TM1637 TM1;

char buffer[5];             // buffer for third display

void setup() {
  Serial.begin(9600);
  Serial.println("Type your text for the display.");
  Serial.println("Now displaying \"----\".");

  TM1.begin(4, 5, 4);       //  clockpin, datapin, #digits
  TM1.displayClear();
  TM1.setBrightness(7);     // full brightness, default is 3
  TM1.displayPChar("----"); // Initial text on third display

}

void loop() {

  if (Serial.available() > 0)
  {
    int inChar = Serial.read();
    if (isprint(inChar))
    {
      for( int i=0; i<3; i++) // shift buffer to the left
        buffer[i] = buffer[i+1];

      buffer[3] = (char) inChar; // add new character
      buffer[4] = '\0';      // add zero-terminator
    }
    TM1.displayPChar(buffer); // display the new text
  }
}