Today I got an Arduino pro mini from Ebay, but cannot identify its type. The item description is not really clear. Is it the 3.3V or the 5V version? The regulator is 3.3V, so i think this is the first one but not sure. Can anybody help me?
Here is a picture of the board:
Connect up 7.5V to 9V to RAW pin & Gnd, see if you get 3.3V or 5v on the VCC pin.
Does the resonator have any markings on it? 8 or 16 or anything?
I think it's 3.3, based on the markings on the regulator.
Do measure to be sure - this QC on those cheap pro minis is non-existent.
Thanks for your answers!
I tried out to power through RAW pin, the result is 3.3V on VCC. So it is 3.3V version.
The resonator has a text ".S08" on it, i think it means 8MHz.
I just did a visual comparison with a relatively new Arduino Pro Mini 328 5v from Sparkfun and the entire thing looks identical with one exception.
Your regulator seems to have the text LG33 where mine has the text 4BMD. I know you already have your answer but the "33" in your photograph stuck out to me.
The part with LG33 on it is the regulator.
3.3volt.
http://www.micrel.com/_PDF/mic5219.pdf
The resonator/crystal is the silver part near pin 2.
Leo..
