How can I represent a number with a decimal point ?

jasonacox / TM1637TinyDisplay

Arduino library to display numbers and text on a 4 and 6 digit 7-segment TM1637 display modules.

GNU Lesser General Public License v3.0

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How can I represent a number with a decimal point ? #16

Closed grilli303 closed 2 years ago

grilli303 commented 2 years ago

The library is very good, but so far I have not been able to represent numbers with a decimal point. In my project, I would like to realize a temperature display and would have to display "12.3°", for example. I tried the following call: display.showString("\xB0", 1, 3); Test with suffix display.showNumber(12.3, 4, 3, 0); However, 12:3° appears in the display. When I look at the library file, it looks like this with the command "showNumberDec" should be possible. Unfortunately I don't know which parameters I have to pass here. I would be very grateful for a small example. Kind regards, Daniel

jasonacox commented 2 years ago

Hi @grilli303 - The TM1637 display modules are hard wired to display colon ":" or decimal "." - they cannot do both unfortunately. You have one that is hard wired to display ":" for a clock but you need one that has decimals hardwired like this one: https://www.aliexpress.com/item/32963180147.html?spm=a2g0o.order_list.0.0.21ef1802UyE4Uc

I have several that show both, but alas, they only display colon or decimal too. It would have been nice to have made them switchable.

jasonacox commented 2 years ago

Closing this. Please re-open if there is an issue we can address.

playrobotics-alex commented 1 year ago

@jasonacox Hi :-) I have the same problem, 0.56 module which physically has dots and colons but probably the dots are not wired. Do you know if there is something I can do physically to the module to wire the dots? I found some 0.56 modules on Aliexpress which have only the dots, but I am not sure that is what I will get :-) If you have any link to such model that will help :)

jasonacox commented 1 year ago

The problem with Aliexpress is that I sometimes order ones that advertise that they ONLY have dots and I get one that only have colons, and then vice versa. They are low cost so just keep ordering until I get what I want. :)

As for hardware updating to fix the colon: The TM1637 drives the DP (decimal point) for each of the 7 segment displays by cycling through each of the digits. You would need to determine how the 7 segment display maps the decimal versus the colon and essentially connect the DP line from the TM1637 to the dots instead.