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Arduino output multiplier: What's a good way to get more pins on my Arduino?
I want more outputs for my Arduino Duemilanove. I want to run a simple 16x16 LED matrix but I'd need more pins. Most instructions I find use one of several chips such as the 7442 1 of 10 decoder IC, another option might be a couple of 4017 decade counters.
Can anybody recommend a method that is widely used and well documented?
Comments
11 years ago
74hc595 shift registers. They can be cascaded, and a dozen of them can run on the same 3 pins, each with 8 outputs. A higher current version is available. It costs $3 on eBay for 10 of them, including shipping.
11 years ago
Try the Maxim Max6953 pdfserv.maxim-ic.com/en/an/AN1033.pdf , which is highly extendable too.
11 years ago
The arduino site is a good start. This article explains how to multiplex and demux and includes some code.