Decimal dot

[silverchair]

Hello,
the library is pretty cool, but is it possible to display decimal dot? Thanks in advance.

[bremme]

Unfortunately, this is not possible. When sending a character to the display there is only one bit to set the colon (two dots), so there is no way to set only the lower dot of the colon. For more information see: SevenSegmentTM1637.h

// SevenSegmentTM1637 low level methods (use when you know what you're doing)
/* Prints raw (encoded) bytes to the display

•     A
  

•   ___
  

• * F | | B
• X -G-
• * E | | C

•   ___
  

•    D
  

• Bit: 76543210
• Segment: XGFEDCBA
  *
• For example to print an H, you would set bits BCEFG, this gives B01110110 in binary or 118 in decimal or 0x76 in HEX.
• Bit 7 (X) only applies to the second digit and sets the colon

Nice, that you like the library!:)

[yucelll]

hello. this library the best library in the all tm1637. basic and fun!
But i dont show "dot"

and i am little known arduino.
i using lm35 and tm1637
i want see on the display: " 25.60 "

and later i want see " 25.6° "

please help me! thanks.

edit___and start arduino and "on" blinking? how much off blink ?

[bremme]

I'm working on a major upgrade for the library which will have better support for the things you mention. I just tested with the Robodyne displays and found out that these displays allow to set the lower and upper dot of the colon separately. The upper colon is set by setting bit 7 of digit 3 and the lower colon is set by setting bit 7 of digit 4. You should be able to set the colon's by using the printRaw function.

To print for example 25.60 on the TM1637 Robodyne display you would use:

byte  rawData[4];
rawData[0] = display.encode('2');
rawData[1] = display.encode('5');
rawData[2] = display.encode('6') ;
rawData[3] = display.encode('0') | B10000000; // set the lower colon, bit 7 on digit 4
display.printRaw(rawData);

To print the degree symbol, you need to set segment A, B, G and F of the last digit. This can be done by:

// same as previous example, only now we set the 4th digit to the degree symbol
rawData[3] = B01100011 | B10000000; // set the lower colon, bit 7 on digit 4
display.printRaw(rawData);

[hectorlee]

I'm using the Robodyn display but it doesn't seem to be able to control the upper and lower colon separately. I'm using one with green 7 segment displays.

This is the code for controlling the colon on mine.

rawData[0] = display.encode('2');
rawData[1] = display.encode('5') | B10000000; // turn on the colon
rawData[2] = display.encode('6') ;
rawData[3] = display.encode('0');
display.printRaw(rawData);

I'm actually most interested in the decimal point on the individual digits can be controlled. Do you think this is possible? The TM1637 should have sufficient pins to do so.

[julienbrunet]

Same here, I bought those sepcific RobotDyn displays because of their decimal dot
But after reading more carefully the description on aliexpress, it says the decimal dot is not active...

And i'm also not able to control the upper / lower colon separately :(

[bremme]

I believe the decimal dots are not wired to the chip on these RoboDyne displays. I have a red version at my desk and this one can display the upper and lower colon by setting the 7th bit (counting from zero). I noticed that I made a typo in my previous post (B1000000 vs B10000000). I just tested it again and it does work on my display:

This is the code I used:

  byte  rawData;
  display.print("256");
  // display degree symbol on position 3 plus set lower colon
  rawData = B11100011;
  display.printRaw(rawData, 3);

[hectorlee]

I guess there might be a difference in the hardware that RobotDyn makes. I loaded your code and this is what I get.

Are you able to control turning on both semi-colon with bit 7 of the second digit? This is the code for turning both parts of the semi-colon.

  display.print("256");
  // display degree symbol on position 3 plus set lower colon
  rawData = B11100011;
  display.printRaw(rawData, 3);

[dterweij]

Hi, I moved to this library because it is a much better (and cooler) one.
Just how to do a "27.3C"?
String temperature = "27.32"; (tho making it a int is no problem)
Maybe using a rouding math for the 4th digit of my string? so .32 becomes .3 and .37 becomes .4 ?
And using the colon for a dot.

[dterweij]

Got it on my own:
int disptemp = 29.09
newTemp makes it 29.1
then times 100 makes 291
set colon on and degree symbol

Hope it helps someone else too.

    float newTemp = disptemp / 10.0; // rounding decimal
    disptemp = newTemp * 100;    
    byte rawData;
    rawData = B01100011;
    display.setColonOn(1);
    display.print(disptemp);
    display.printRaw(rawData,3);

[techi602]

I also thought that the robotdyne display features decimal points per digit, but unfortunetly it does not:

This is a basic 4-digit 7-segment display module (GREEN). The display features double points in midle. The decimal point per digit not active.
Module connecting to digital I/O on 2 pins.
For Arduino use library: TM1637.h

http://robotdyn.com/catalog/segment/4_digit_led_display_tube_7_segments/

[Highcooley]

The new ones do:
http://robotdyn.com/4-digit-led-display-tube-7-segments-tm1637-50x19mm.html

[ybaransky]

Bram (or anyone) - how can you tell which of the TM1637 based 4-digit LED's are enabled for decimal point or colon functionality? I purchased
https://www.ebay.com/itm/112674024638?ul_noapp=true
thinking it would support both. Looks like it only supports colon mode. I was hoping there would be a way to set the board up in colon or dp mode via software. Does not look good. Thx -yurij