- how to get 100 digital pins
- how to merge boards
thanks
thanks
samir_assaad:
- how to get 100 digital pins
IO expanders or shift registers.
samir_assaad:
- how to merge boards
With a big hammer, or by linking them together through a serial bus system, such as I2C, SPI, etc.
how to use (IO expanders or shift registers.)
if you have tutorial
thanks
Try this:
Outputs
Inputs
Don't know what you mean merge boards.
thanks
Yes, if you write the code to do so.
You need a power supply to handle 100 LEDs .
One way - use two MAX7219. Can use two of these boards and an Uno. The LEDs are multiplexed, turned in groups of 8.
Or use shift registers, with no multiplexing. This board drives 96 LEDs, can use spare IO pins for the last 4. Arduino function is provided by the '328P, and offboard FTDI adapter is used to download code into the board.
http://www.crossroadsfencing.com/BobuinoRev17/
I'll have to get one of those boards.
new board Crossroads ?
Yes, posted word about it fairly recently.
Here's the schematic and a demo of some lights flashing.
http://www.crossroadsfencing.com/BobuinoRev17/MAX7219demo_movie.AVI
hi crossroads ,
im from lebanon , The country does not let anyone to enter the electronic unless he has a license from the company. I do not have any license will remain the board on the airport.
thanks
samir_assaad:
- how to get 100 digital pins
- how to merge boards
thanks
better use I2C
I've used six [u]MAX6978[/u] chips to control 48 LEDs. These are specialized LED driver shift registers. You can daisy-chain these together to control as many LEDs as you like with only 3 Arduino outputs. They also make a 16-port version.
A "regular" shift register chip can be used the same way except you need current-limiting resistors in series with each LED.
Doesn't matter what we suggest if the government/customs won't let electronics into the country; anything would need to be ordered by a qualified middle man.