TM1637 display problem

Using Arduino Project Guidance
1

I'm trying to use a TM1637 with a Nano. The wiring seems correct (see photo) and the code is a sample test code, but nothing happens. I've tried another display in case it was broken (both were new).

What's the simplest test I can do? Here's the code I'm trying, but seems like overkill.

#include <Arduino.h>
#include <TM1637Display.h>

// Module connection pins (Digital Pins)
#define CLK 11
#define DIO 10

// The amount of time (in milliseconds) between tests
#define TEST_DELAY   2000

const uint8_t SEG_DONE[] = {
	SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,           // d
	SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,   // O
	SEG_C | SEG_E | SEG_G,                           // n
	SEG_A | SEG_D | SEG_E | SEG_F | SEG_G            // E
	};

TM1637Display display(CLK, DIO);

void setup()
{
}

void loop()
{
  int k;
  uint8_t data[] = { 0xff, 0xff, 0xff, 0xff };
  uint8_t blank[] = { 0x00, 0x00, 0x00, 0x00 };
  display.setBrightness(0x0f);

  // All segments on
  display.setSegments(data);
  delay(TEST_DELAY);

  // Selectively set different digits
  data[0] = display.encodeDigit(0);
  data[1] = display.encodeDigit(1);
  data[2] = display.encodeDigit(2);
  data[3] = display.encodeDigit(3);
  display.setSegments(data);
  delay(TEST_DELAY);

  display.clear();
  display.setSegments(data+2, 2, 2);
  delay(TEST_DELAY);

  display.clear();
  display.setSegments(data+2, 2, 1);
  delay(TEST_DELAY);

  display.clear();
  display.setSegments(data+1, 3, 1);
  delay(TEST_DELAY);


  // Show decimal numbers with/without leading zeros
  display.showNumberDec(0, false); // Expect: ___0
  delay(TEST_DELAY);
  display.showNumberDec(0, true);  // Expect: 0000
  delay(TEST_DELAY);
	display.showNumberDec(1, false); // Expect: ___1
	delay(TEST_DELAY);
  display.showNumberDec(1, true);  // Expect: 0001
  delay(TEST_DELAY);
  display.showNumberDec(301, false); // Expect: _301
  delay(TEST_DELAY);
  display.showNumberDec(301, true); // Expect: 0301
  delay(TEST_DELAY);
  display.clear();
  display.showNumberDec(14, false, 2, 1); // Expect: _14_
  delay(TEST_DELAY);
  display.clear();
  display.showNumberDec(4, true, 2, 2);  // Expect: 04__
  delay(TEST_DELAY);
  display.showNumberDec(-1, false);  // Expect: __-1
  delay(TEST_DELAY);
  display.showNumberDec(-12);        // Expect: _-12
  delay(TEST_DELAY);
  display.showNumberDec(-999);       // Expect: -999
  delay(TEST_DELAY);
  display.clear();
  display.showNumberDec(-5, false, 3, 0); // Expect: _-5_
  delay(TEST_DELAY);
  display.showNumberHexEx(0xf1af);        // Expect: f1Af
  delay(TEST_DELAY);
  display.showNumberHexEx(0x2c);          // Expect: __2C
  delay(TEST_DELAY);
  display.showNumberHexEx(0xd1, 0, true); // Expect: 00d1
  delay(TEST_DELAY);
  display.clear();
  display.showNumberHexEx(0xd1, 0, true, 2); // Expect: d1__
  delay(TEST_DELAY);
  
	// Run through all the dots
	for(k=0; k <= 4; k++) {
		display.showNumberDecEx(0, (0x80 >> k), true);
		delay(TEST_DELAY);
	}

  // Brightness Test
  for(k = 0; k < 4; k++)
	data[k] = 0xff;
  for(k = 0; k < 7; k++) {
    display.setBrightness(k);
    display.setSegments(data);
    delay(TEST_DELAY);
  }
  
  // On/Off test
  for(k = 0; k < 4; k++) {
    display.setBrightness(7, false);  // Turn off
    display.setSegments(data);
    delay(TEST_DELAY);
    display.setBrightness(7, true); // Turn on
    display.setSegments(data);
    delay(TEST_DELAY);  
  }

 
  // Done!
  display.setSegments(SEG_DONE);

  while(1);
}
3

This is a test programme running ell in my Arduino NANO with DIO at DPin-4 and CLK at DPin-3.

// Include the library
#include <TM1637Display.h>

// Define the connections pins
#define CLK 3
#define DIO 4

// Create a display object of type TM1637Display
TM1637Display display = TM1637Display(CLK, DIO);

// Create an array that turns all segments ON
const uint8_t allON[] = {0xff, 0xff, 0xff, 0xff};

// Create an array that turns all segments OFF
const uint8_t allOFF[] = {0x00, 0x00, 0x00, 0x00};

// Create an array that sets individual segments per digit to display the word "dOnE"
const uint8_t done[] = {
  SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,           // d
  SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,   // O
  SEG_C | SEG_E | SEG_G,                           // n
  SEG_A | SEG_D | SEG_E | SEG_F | SEG_G            // E
};

// Create degree celsius symbol
const uint8_t celsius[] = {
  SEG_A | SEG_B | SEG_F | SEG_G,  // Degree symbol
  SEG_A | SEG_D | SEG_E | SEG_F   // C
};

void setup() {

}

void loop() {
  // Set the brightness to 5 (0=dimmest 7=brightest)
  display.setBrightness(5);

  // Set all segments ON
  display.setSegments(allON);

  delay(2000);
  display.clear();

  // Show counter 0-9
  int i;
  for (i = 0; i < 10; i++) {
    display.showNumberDec(i);
    delay(50);
  }

  delay(2000);
  display.clear();

  display.showNumberDec(-12);     // Prints _-12
  delay(2000);
  display.clear();

  display.showNumberDec(-999);    // Prints -999
  delay(2000);
  display.clear();

  display.showNumberDec(31, false); // Prints __31
  delay(2000);
  display.clear();

  display.showNumberDec(31, true);  // Prints 0031
  delay(2000);
  display.clear();

  display.showNumberDec(14, false, 2, 1); // Prints _14_
  delay(2000);
  display.clear();

  display.showNumberDec(-5, false, 3, 0); // Prints _-5_
  delay(2000);
  display.clear();

  // Prints 12:34
  display.showNumberDecEx(1234, 0b11100000, false, 4, 0);

  delay(2000);
  display.clear();

  // Prints 15°C
  int temperature = 15;
  display.showNumberDec(temperature, false, 2, 0);
  display.setSegments(celsius, 2, 2);

  delay(2000);
  display.clear();

  // Prints dOnE
  display.setSegments(done);

  while (1);
}

I have also run your sketch of post #1 which is also running well.

4

FFS, I changed the dupont cables and it worked ;( apologies

6

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