Hi

I’m up to a project using one or two MaxOs to drive some leds (the standard ones you can stick into a hole on a thin wooden board). I read the ports have a 330 ohm resistor built in.

What LEDs would one typically use? I’m currently looking on mouser.com, and can’t seem to find any LED that would fit the 3.3V / 330 ohm nicely.

I understand that the formula for calculating the forward current is: I = (V - Vf) / R

E.g. using Vf = 1.9V, V = 3.3V, R = 330 ohm yields I ~= 4.2 mA

The closest matching LEDs I can find are 2 mA (would break) and 10 mA (probably not enough to really light it?). It’s the same for all other Vf I tried.

I feel lost. Thanks in advance for any helpful answer.