Any electricians out there?
I have an LED that uses 2,2 volt and since the axoloti shoots out 3,3 volt I need the right resistor! Can someone help me?
Get familiar with Ohm's law. Lookup the current (ampere) of your LED and do the math:http://www.ohmslawcalculator.com/ohms-law-calculator
About 200 ohms should be OK.You could go a little lower, but that depends on what you are trying to do.If you just want to light the led up, the 200 should be fine.
In series with an LED across the power supply, the resistor functions as a current limiter. The current flow effects the LED brightness. What I do in this situation is put a potentiometer (I'd try a 1KB pot), starting at 1K (not zero or you'll fry the LED) and slowly decrease it until you get the desired brightness. Then measure the setting and substitute a similar fixed resistor.