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Topic: 900 Led controller (Read 1 time) previous topic - next topic

manteliukasx

Hi! i want to ask is any chip which supports arduino, have atleast 10output pins and 5input pins, also each can be loaded 500mA or more?
I want to make big project with led multiplexing, so my arduino one pin can load only 2 leds with 20mA current, but i need 25-30 leds in row to control. Also i think i could make 5bit combiter with bc547 transistors to use lesser pins. Please help me and leave advice :)

Grumpy_Mike

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is any chip which supports arduino, have atleast 10output pins and 5input pins,

Yes there are lots.
One option is shift registers:-
http://www.elcojacobs.com/shiftpwm/

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also each can be loaded 500mA or more?

No there are none that include his function.
To do this you have to add external FETs to the logic outputs of the expander chip.

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leave advice

Forget 900 LEDs until you know a lot more than you do at the moment. Electronics do not scale up to this sort of size very easily.

manteliukasx

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To do this you have to add external FETs to the logic outputs of the expander chip.

Can you explain about external FETs?

Boffin1

I use  TPIC6B595 shift registers to latch the high current outputs for long strings of LEDs , it can stand 50 volts )  Some of my projects use 2500 LEDs.

You would have to split the LED strings to have 150mA per pin  (  they can be daisychained and just use 3 pins of the Arduino )
With my mobile phone I can call people and talk to them -  how smart can you get ?

manteliukasx

Now i understand! that 5bit computer which i mean is shift register... Whats why in led cubes sets transistors, its like shift registers.. Thanks you. One more question, do you know any shift register which can load atlest 500mA current or more?

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