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How to use 8 digit 7-segment display modules with the Raspberry Pi #piday #raspberrypi @Raspberry_Pi

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7- segment display modules and the Raspberry Pi. via raspberrypi-spy.co.uk

7 segment displays are a well established way of electronically displaying numbers and a small set of letters. They’ve been around for as long as I’ve been playing with electronics but were a pain to wire up given the number of LEDs involved.

Luckily things are a lot easier now that they are available on pre-made modules that uses an SPI interface. This is easy to setup and use on the Raspberry so for about £3 you can add a strip of 8 7 segment digits.

These modules tend to all use the Maxim MAX7219. This IC does all the hard work and we can communicate with it using SPI and a few lines of Python.

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