Hello again everyone!
My 25-note "foot"board project is coming along nicely (the code is working great, just building my enclosure) but I wanted to ask a quick question or two about powering everything via an external source.
At this point I am hoping to be able to run my Teensy++ 2.0 via USB and external power but NEVER at the same time...I will ONLY use external power when using the standard 5-DIN MIDI jack INSTEAD of USB. I was thinking that I would need to follow the advice on the Teensy pages where the 5v pads are cut and a diode is installed; however, when I thought about this, there shouldn't ever be an occassion for me to have both power sources connected so, am I right in thinking that I don't have to worry about doing any of three mod options (i.e. cut the link, cut the USB cable, or cut link and install diode)?
In terms of power, the second thing I have been thinking about is whether my project will consume more than the 5v available...
Obviously the Teensy itself needs some power, I'm going to have a slide potentiometer for "volume control" that needs some power, and I'm hoping to a) illuminate an LED (blue or green) when the 25 keys are shifted below my base octave and b) illuminate a different LED (red) when the 25 keys are shifted above my base octave.
Knowing that the LEDs may require 2-6v themselves, am I going to run out of available power? I know the LEDs will both have current limiting resistors on them but, to maintain enough power for everything else, would those resistors have to be large enough that the LEDs won't be bright enough to even make them worth including?
- brad -
My 25-note "foot"board project is coming along nicely (the code is working great, just building my enclosure) but I wanted to ask a quick question or two about powering everything via an external source.
At this point I am hoping to be able to run my Teensy++ 2.0 via USB and external power but NEVER at the same time...I will ONLY use external power when using the standard 5-DIN MIDI jack INSTEAD of USB. I was thinking that I would need to follow the advice on the Teensy pages where the 5v pads are cut and a diode is installed; however, when I thought about this, there shouldn't ever be an occassion for me to have both power sources connected so, am I right in thinking that I don't have to worry about doing any of three mod options (i.e. cut the link, cut the USB cable, or cut link and install diode)?
In terms of power, the second thing I have been thinking about is whether my project will consume more than the 5v available...
Obviously the Teensy itself needs some power, I'm going to have a slide potentiometer for "volume control" that needs some power, and I'm hoping to a) illuminate an LED (blue or green) when the 25 keys are shifted below my base octave and b) illuminate a different LED (red) when the 25 keys are shifted above my base octave.
Knowing that the LEDs may require 2-6v themselves, am I going to run out of available power? I know the LEDs will both have current limiting resistors on them but, to maintain enough power for everything else, would those resistors have to be large enough that the LEDs won't be bright enough to even make them worth including?
- brad -