[closed] How to differentiate Arduino Pro Mini 3v3 and 5v?

[funky81]

Like in the title, are there any guide to differentiate between these two items?
especially when you buy from ebay or aliexpress.

thanks

[bjornhallberg]

@funky81 If you look closely at the regulator, there should be some marking, whether it be a clone or not the regulator ought to be or appear to be a Micrel Mic5205. It should be either KB33/LB33 or KB50/LB50 for 3.3V or 5V.

[BulldogLowell]

Or very easily...

apply between 5 and 12VDC to Vin and ground (attach to USB)

Read voltage at Vcc and ground...

the 3.3V pro mini will read 3.3V, and if it is a 5V, well you will read 5.

[HarryDutch]

If you have removed the regulator, take the bare minimum sketch, put Serial.begin(9600) in the setup and Serial.println("blablabla") in the loop. Then select Pro mini and 3.3v processor. If you get gibberish in you serial monitor you have a 5v version and if you see blablabla you have a 3.3v version. Try it. Works with 5v 16Mhz and 3.3v 8 Mhz.

[funky81]

Thanks guys for your replies...I'll try it one by one.

Thanks