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TM1650 Arduino library for 2 x 8 led display

stealthrt

Hey all I am using a 2 digit 8 segment TM1650 Arduino library and I can't seem to find the setting for that? I can only find TM1650_DISPMODE_4x8 and TM1650_DISPMODE_4x7. No 2x8.

My setup looks like this when running the code below:
image


My Arduino nano code:

#include <TM1650.h>
#include <TM16xxDisplay.h>

//              [data Pin]
//              |  [clock Pin]
//              |  |  [num Digits]
//              |  |  |  [activate Display]
//              |  |  |  |     [intensity]
//              |  |  |  |     |  [display mode]
//              ↓  ↓  ↓  ↓     ↓  ↓
TM1650 display1(2, 3, 2, true, 7   );

void setup()
{
}

void loop()
{
   int n;

   for (n = 0; n < 10; n++)
   {
      //                             [nNumber]
      //                             |  [byte bDots]
      //                             ↓  ↓
      display1.setDisplayToDecNumber(n, 0b0000);
      delay(250);                               
   }
 }

If someone could let me know how to go about modifying the code in order to allow me to use just 2 digitals instead of 4 then that would be great!

  • Hi, I don't get the issue.  You can leave it at 4x8 or 4x7 and just write two digits. For instance if you wish to write the number 42 then try writing 42 or 0042, or try writing 4200 and see which works. 

    The animated GIF is not very helpful, there is poor contrast without a filter, also if you can just indicate in a photo or diagram which segments are lighting up for some example digits. Then that may help make things easier. 

    If you're finding that incorrect segments are lighting that do not resemble digits at all, then the manufacturer of the board that you're using has mapped segments differently to what the library uses. You'd need to then make changes to the library code.

  • in reply to shabaz

    Thanks for the reply  I found some code that works a little. Still trying to find an example of how to go about reading what's on the led segment screen. I see there is a receive() function but no examples on how to go about using it.

  • in reply to stealthrt

    It's possible that the receive function may be for keypad entry (the TM1650 chip can be wired to a keypad), rather than retrieving the LED segments that are lit. It would need the source code to be examined to identify this for sure. In any case, if you wish to retain knowledge of what the TM1650 was instructed to display, then that can be done with a variable within your Arduino code, i.e. store it in RAM on the Arduino nano's microcontroller. That way there's no need to query the TM1650 chip.