I want to do something like the first of the gadgets in this video:
https://www.youtube.com/watch?v=aEo_nJ3iUYI (0:07 - 1:00)
It's a flashlight connected to the micro USB port in my cell phone, but I do not know if this is safe.
In case it can be build without problems, I've been looking for some information, and I have some doubts:
- A micro USB connector has 5 pin (VCC, D-, D+, ID, GND), to which one of these should I connect the resistor and the LED anode?
- So it can be used with any phone, what resistor should I use?