2.3" 6 digit LED display PCB with SPI interface for electronics hobbyists. Sponsored by NextPCB.com

This is one of my home made projects which I thought I'd share. It seems that there are plenty of MAX7219 and similar based display modules available on eBay / Amazon etc but all have digits that are no more than 0.56" high.

As there does not appear to be a large display module available I decided to make one. My version has 2.3" high digits and although it is not MAX7219 based it uses the standard SPI (Serial Peripheral Interface) which is found on most modern microcontrollers. The board supports both 3.3V and 5V logic level inputs and is simply a chain of shift registers.

A logic 1 turns a segment on, a logic 0 turns it off. The Output Enable pin is brought out onto the data input connector too so it can be used to control display brightness via PWM. Data direction is right to left i.e. the rightmost shift register is the first one on the chain.

I have wrote some sample code for an Arduino to demonstrate the board which can be found on my blog below along with full instructions. Link here https://www.adrian-smith31.co.uk/blog/2024/04/6digitspi/

You can also purchase some of these boards ready assembled on my eBay site. Link to this on my blog above.

This project was sponsored by NextPCB who kindly offered to make the PCB's for them. Their website can be found here https://www.nextpcb.com/ ... https://www.youtube.com/watch?v=eKuvKOkwBKw