How to flash hundreds of LEDs with Raspberry Pi?

Question

Do it yourself

Can anyone tell me how to organize the control of a large number of LEDs using Raspberri Pi?
Interested in the cheapest options possible.

Answer 1

The most banal option is on shift registers.

Answer 2

You can go into more detail :)
True for AVR, but the main thing is to understand the principle and the platform is not important avrlab.com/node/114
Cheaper and easier than a sdig register, nothing has been invented yet.

Answer 3

i2c io expander will help: connect via two wires, and you can put several cases on the bus, and it has 24 legs, if not 32.

Answer 4

More would...

Answer 5

There is a similar question How to place 70 sensors - reed switches on arduino?
There is an answer there. Use by analogy.
You need, judging by your question, a multiplexer. Although if you wrote more about your project, then it turned out to advise more specifically.
By the way, here is a similar project about "expanding" the number of inputs on arduino.ru is being discussed.
And here you can pick up different multiplexers Digital demultiplexers for GPIO expansion and decoding
Take a look at this project On the basis of 16×64 dot matrix LED design on dis...
In fact, in order to receive signals, you can use the matrix principle, like polling keyboard signals. Here Matrix keyboard , by the way, I also recommend looking here .
But if you take a look atATMEL Application Note AVR240 , creatively modify the circuit by adding multiplexer(s), get the result. But still, there are features with the receipt of multiplexed signals. Therefore, it is better to describe your task in more detail.
Keywords "decoder" and "shift register".