TM1638 add on large segment display

Does anyone know if the TM 1638 LED display is common cathode or anode?
I see I could "hack" a large segment display onto the back of the existing one. Id like a big gear indicator without extra coding.
Does anyone know if the display is common cathode or anode ? I really cannot tell on my existing one...
Dave.

The one I used is comon
cathode.

http://www.xsimulator.net/community/threads/2dof-compact-seat-mover.6654/page-3#post-89667

Keep in mind that different (size or colour) elements have different voltage and current requirements (and maximum thresholds) to be able to work.

So a larger (or different color) 7 segment digit might not work with the current provided from your board.

I did not have succes trying to "steal" a signal and use it to power a blue comon cathode digit while i was able to succefully power a red comon cathode digit.

Good luck.
Here are some scems that might help.

Cheers, It looks like a nightmare to try to "hack" the back of the display to rewire a single large segment on at this stage. That and I am not really sure, but it looks like common cathode TM1638.
I can put a 5v power supply on the ard if needed to give it extra juice.
I do recall somewhere there was a large segment display setup with a TM 1638 and extra code as well. Buggered if I can find the thread. I will look again

if you use "achub" to transmit data to the ard+Tm1638
then there is a native config to use a standalone 7segment directly for gear indicator,
powered from your arduino.

Pardon sir? , whats achub?

achub is the program from assetto corsa forum.

You asked me a while ago in another thread and i thought you remembered it.

http://www.xsimulator.net/community/threads/2dof-compact-seat-mover.6654/page-3#post-88330

@bsft my dash uses achub too as @pipis2015 mentioned above and its made from two Tm1638 and one seven segment display (use common anode so you can use more than the 5v segments)

thanks, I forgot. Cheers.

hello could you provide more specific explainations about the wiring . i am trying to figure what you mean but dont fully understand .
might seem easy to you but some explanations for newbies would be nice
thx

Each segment (bar) inside the digit is named by a letter.

Starting with "a" for the top "bar" and so on.

So for number "2" for example you need to "light" segments:
a, b, g, e, d.

Depending on design there are two types of seven-segment digit types.

Common anode and common cathode.

The one uses common positive and the other common (for all segments) negative "wiring".

The numbers on the four digit display represent the order of digits... with pin "D 1" being the cathode for the first digit (since its a common cathode display) and so on.

Here is the datasheet for the TM1638 driver that shows not only the schematic for the display interface, but also how to interface with the driver if you chose not to bypass it.
https://dl.dropboxusercontent.com/u/8663580/TM1638English version.pdf

thanks fellas, I will look into this more when I have more time

thank you very much .

that s now my next project

questions:
in case of a common cathode D1 goes to a 5v?
what is dp ? how the added segment connects to D1 ? is it through dp on the added segment?

hello I d like some more explanations
a goes to A
b goes to B
c goes to C
d to D
e to E
f to F
g to G
n case of combined cathode : do we have to perform a connection of the two ground pins (on large segmnt) to tm1638 ground ? (i suppose)
where goes D1 (in case of D1 used ) ? does it go to dp on the large added segment?

dp is the demical dot.
d1 conects to gnd if your 4 digit and large digit are both common cathode).
but the current will probably not be sufficient for the larger digit to work.

can you use a large segment being common anode regardless of the type of the 4 digit display. this would solve the lack of amperage ?

are you going to use the tm1638 board together with an arduino?

yes i already use a TM1638 and an arduino uno rev 3

http://lucidtronix.com/tutorials/2

have a look here