[TriEmbed] Voltage & LEDs

[Grawburg]

I mentioned Monday that the infrared LED & phototransistor are not powered by the Raspberry Pi but from an external
3.3 VDC supply.  I'm using 220 ohm resistors on the emitter and 10k on the detector. If they were being powered directly
from the Pi I'd use 470s on the emitter.


I have two pair now, but could have 4 pair later, I think I will continue to use external power for them. Am I 
correct in my thinking that under these circumstances 220 ohm resistors are sufficient for the emitters?




Brian Grawburg





-- 
I will no longer use Mozilla/Firefox. I now use Opera Web Browser.