Flowcode Support Board

Posted: **Wed Feb 04, 2026 2:14 pm**

Hi,

I am looking to replicate the design below on 8x 7-segment displays, and for this purpose, I will need 2x 74HC595 via the SPI interface.

: 4-Digit-7-Segment-LED-Display-Module-Circuit.png (35.4 KiB) Viewed 51 times

Can someone please let me know, through an example, how I can multiplex those 8 digits on an Arduino Nano 328?
Is it possible to do it only via SPI, or will I need a common anode/cathode for each digit?

Thank you,
Andreas

Posted: **Wed Feb 04, 2026 3:38 pm**

The 74HC595 devices are daisy-chained - so writing values will 'push' the data to the second chip... So you just need to write sufficient data for both devices before latching the data. I haven't used this - but the MAX7219 works in a very similar manner.
Martin

Flowcode Support Board

2x 74HC595 via SPI interface, driving 8x 7-segment display

2x 74HC595 via SPI interface, driving 8x 7-segment display

Re: 2x 74HC595 via SPI interface, driving 8x 7-segment display