#include <TM1637Display.h>

#define TEST_DELAY   2000
#define CLK 4
#define DIO 2
TM1637Display display(CLK, DIO);

void setup() {
  // put your setup code here, to run once:
  display.setBrightness(0x0f);
}

const uint8_t SEG_T[] = {
  SEG_D | SEG_E | SEG_F | SEG_G, // t
  0x0,
  0x0,
  0x0,
};

char CHARS[4] = {
  0x0, 
  0x0,
  0x0,
  0x0 };

void loop() {
  float temp = 15.6;
  dtostrf(temp, 4, 1, CHARS);
  Serial.print("t-dtostrf = ");
  Serial.println(CHARS);
  // shift the values
  for(int i=0;i<=1;i++) {
    CHARS[i+2] = display.encodeDigit(CHARS[i]);
  }
  CHARS[0] = SEG_T[0];
  CHARS[1] = SEG_T[1];
  Serial.print("shifted = ");
  Serial.println(CHARS);
  display.setSegments((const uint8_t*)CHARS);
  delay(TEST_DELAY);
}