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Max Current for EMX (FEZ) IO


#1

What is the max current draw GPIO pins can handle on FEZ Spider/Cerberus/Hydra, etc?

I’ve been searching and looking at schematics, but have not found the answer and am more of a software guy anyway, just need to know the basics. Thx!


#2

40 mA typically


#3

4mA not 40mA.

40mA was on old 5V micros. Anything new is under $10mA.


#4

whoa, I better go easy on my hello-world GPIO LED then. :slight_smile: Sounds like a transistor is defacto.


#5

MaxO module lets you connect 32 LEDs with ease :slight_smile:


#6

You can use low current LEDs (2 mA) without a transistor:
http://www.kingbrightusa.com/category.asp?catalog_name=LED&category_name=KCLow+Current+LED&Page=1


#7

Whoa is right.

@ Gus, this would be good data to add to the mainboard product/developer pages. Or even better, print it right on the mainboards. This question used to come up alot but not as often since Gadgeteer.