- Thu Mar 20, 2008 11:14 pm
#45092
I have recently picked one of these up for a project and it has been working perfectly. I am able to control the on-board LED with no problem.
My question is what do I interface with the GPIOs? For instance, I picked up and Opto-Isolator that works perfectly at low voltages - so the 2.8v is fine, but the problem is that the 1ma can't drive the opto-isolator's photodiode.
Is there a specific opto-isolator that I should be using or some other means of controlling higher voltage/amperage devices such as relays and motor controllers?
Thanks for any advice - I'm a s/w engineer teaching myself about transistors, biasing, base/emitters/collectors, diodes etc. Things are going well, I just don't know how to build a hardware interface to the Sparkfun USB board/GM862.
Thanks!
/jd
My question is what do I interface with the GPIOs? For instance, I picked up and Opto-Isolator that works perfectly at low voltages - so the 2.8v is fine, but the problem is that the 1ma can't drive the opto-isolator's photodiode.
Is there a specific opto-isolator that I should be using or some other means of controlling higher voltage/amperage devices such as relays and motor controllers?
Thanks for any advice - I'm a s/w engineer teaching myself about transistors, biasing, base/emitters/collectors, diodes etc. Things are going well, I just don't know how to build a hardware interface to the Sparkfun USB board/GM862.
Thanks!
/jd