danners430
Member
Hey guys,
I'm using some RGB LEDs in my project, which have a common cathode. However, I'm also using 10 of them at once. My question here is twofold: can the picaxe source enough power to power all ten of these LEDs (20mA typical forward current per colour, obviously through resistors)?
If the picaxe can't source enough power to power all 10 LEDs, then the obvious solution is a transistor switching circuit. However, as the LEDs have a common cathode as mentioned above, the traditional NPN low side switching seems to be out the window. I also heard there were some difficulties using a PNP transistor to do the switching; so my second question is if the picaxe can't source enough power, what sort of switching circuit should I use?
Cheers guys
I'm using some RGB LEDs in my project, which have a common cathode. However, I'm also using 10 of them at once. My question here is twofold: can the picaxe source enough power to power all ten of these LEDs (20mA typical forward current per colour, obviously through resistors)?
If the picaxe can't source enough power to power all 10 LEDs, then the obvious solution is a transistor switching circuit. However, as the LEDs have a common cathode as mentioned above, the traditional NPN low side switching seems to be out the window. I also heard there were some difficulties using a PNP transistor to do the switching; so my second question is if the picaxe can't source enough power, what sort of switching circuit should I use?
Cheers guys