I have a 4 digit LED display that I would like to integrate into my project, but only has 12 total pins when there are 4 digits. I am a beginner so I do not know how or which pins to power in order to display the required digits. Here are a few images of the LED Display. The number on the side is LD-5461BS.

If there is a configuration manual for this particular LED display, that would help as well.


From some Googling this seems like a commonly produced module based around the CA-5461BS chip. It might have many manufacturers like the HD44780-based LCD module.

To summarise it's behaviour, it consists of four separate digits with a separate anode per digit and shared cathodes for each digit. See page 3 of the PDF.


If you've got a little real estate to spare and you're not super cost-constrained, you could use one 8-bit shift register per 7-segment display. Using this approach and some smart bit-banging, you can run all 4 displays with just 3 pins.

I've seen a lot of hobbyists use the 74HC595 in such an application (see this example). It has a data out pin that supports cascading, so for 4 displays you have an 32-bit shift register across 4 devices. You clock the word into the register, then load it into the output buffers. This approach may be a little slower than a dedicated strobing IC, but it will be completely flicker-free.

  • 1
    \$\begingroup\$ This is a very useful way of doing things for hobbyists, the users learn a whole lot of practical digital electronics with it. +1. \$\endgroup\$ Nov 23 '12 at 8:12

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.