#80 Scrolling LED Matrix MAX7219 *Updated*

More information in my GitHub:
https://github.com/RalphBacon/Video-8...

It's been a year since my original video on MAX7219 Scrolling Text and this update shows a massive step forwards in ease-of-use by using the 4-in-1 units that are available for around $3.60 (£3.13).

This makes it very easy and affordable to have a decent length of scrolling text to report on the weather, perhaps, or YouTube statistics, or even the stock market!

I also cover a problem with the original 4-unit display (consisting of four individual 8x8 LED matrix units wired top-to-tail  - and a potential solution.

And I cover a less-than-optimal 125kHz RFID reader that whilst very cheap just did not perform as expected.

All sketches used (along with relevant libraries) can be found in the links below, with most of the stuff you need in my GitHub repository which you can download as a zip file.


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125kHz RFID links     125kHz RFID links     125kHz RFID links    
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http://blog.deconinck.info/post/2015/...

RDM630/6300 Data sheet
http://store.iteadstudio.com/images/p...

RDM6300 125Khz RFID library (software serial so you can still upload code using the USB port)
https://github.com/Seeed-Studio/RFID_...


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MAX7219 LED links        MAX7219 LED links        MAX7219 LED          
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Hobby Components forum article on the MAX7219
http://forum.hobbycomponents.com/view...

Hobby Components MAX7219 library (works with more than four 8x8 LED matrices)
http://blog.hobbycomponents.com/?p=334

Notes from Nick Gammon on the MAX7219 LED multiplexer (well worth reading)
http://www.gammon.com.au/forum/?id=11516

Nick Gammon's MAX7219 library (original) for the 4-in-1 LED unit
https://github.com/nickgammon/MAX7219...

Nick Gammon's Bitbanging SPI library (required for Nick's MAX7219 library)
https://github.com/nickgammon/bitBang...

My amended version of Nick Gammon's MAX7219 library to work with Eclipse IDE AND have an extra function exposed
https://github.com/RalphBacon/MAX7219... (zip)

My amended version of Nick Gammon's smooth scrolling sketch to include brightness/speed/switch off controls
and how to concatenate the message string with special characters (like the 'degrees' symbol)
https://github.com/RalphBacon/MAX7219... (zip)

IMPORTANT WIRING NOTE
Note that where Nick mentions the LOAD pin he means the CS (Chip Select) pin on the MAX7219 displays (they have changed the name, I guess)

Arduino Uno/Nano
Pin 13 - goes to MAX7219 4-in-1 display pin CLK (Clock)
Pin 11 - goes to MAX7219 4-in-1 display pin DIN (Data in)
Pin 10 - goes to MAX7219 4-in-1 display pin CS (Chip select)


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My channel is here:
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ralphbacon
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How can I remember this? Memory tip: "See" Ralph Bacon, geddit?

• #science_technology
• #arduino
• #electronics
• #c
• #microcontrollers
• #programming
• #gadgets
• #max7219
• #4_in_1
• #led_matrix
• #125khz
• #rfid
• #scrolling_text