12v LED display using UNO and UNL2003

Using Arduino LEDs and Multiplexing
#1

hi there im using the uno AND THE 3 SEVEN segment LEDs (SMALL led) for the display they work fine when the CD4094 giving the proper output

But when i connect them to the 12V 4INCH seven segment display using the UNL2003 it is not showing any digits but when i test them with 12 v direct supply them work fine…

both the pics i have given below

nclude <EmSevenSegment.h>

EmSevenSegment disp(3,'A',4,3,2);

void setup(){
}

//=============================================================//
void loop(){
  //disp.test();
  disp.print(786);
  delay(1000);
}

using this code only for testing

#2

Please read this:-
How to use this forum

It will tell you how to ask a question. In your case we need to know what your schematic is.

#3

Standard answer: Use high voltage shift registers (instead of the CD4094/ULN2003) to drive large displays.
The TPIC6B595 is cheap on ebay.
Three Arduino pins to drive as many digits as needed.

Sparkfun has a "large digit" example (Google it).
Leo..

#4

Laharsh:
both the pics i have given below

I don't think so! :roll_eyes:

Try again.

#5