<![CDATA[How can I tell if my arduino mini pro is 3.3V or 5v?]]>Hello all,

I already did some tests with arduino nanos, and so far it has been very sucessfull, thanks to this excellent page!

Now I'd like to try some of arduinos mini pro I have lying around, but I'm not sure which type they are. I don't want to risk burning my sensors...

Is there any way to tell the difference?

Thanks in advance,
Joaoabs

]]>https://forum.mysensors.org/topic/1389/how-can-i-tell-if-my-arduino-mini-pro-is-3-3v-or-5vRSS for NodeThu, 21 May 2026 13:31:26 GMTMon, 11 May 2015 23:28:09 GMT60<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Fri, 28 Oct 2016 12:08:04 GMT]]>@Alexandre-Magno

Hi!

Look here: https://www.arduino.cc/en/Main/ArduinoBoardProMini
Check the documentation/schematics section.

]]>https://forum.mysensors.org/post/51273https://forum.mysensors.org/post/51273Fri, 28 Oct 2016 12:08:04 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Thu, 27 Oct 2016 22:08:29 GMT]]>@Alco-van-Neck said:

ebay 5v white button

I am searching the schematic of this board. Someone here have it?

]]>https://forum.mysensors.org/post/51256https://forum.mysensors.org/post/51256Thu, 27 Oct 2016 22:08:29 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Thu, 21 May 2015 05:18:59 GMT]]>@BulldogLowell Thanks your determining way is the best way to check a Pro mini with no USB! You can just use the programming cable connected to RAW and check the VCC it will be slightly less like 4V7 or 3V2 but close enough.

]]>https://forum.mysensors.org/post/14442https://forum.mysensors.org/post/14442Thu, 21 May 2015 05:18:59 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Tue, 12 May 2015 20:05:44 GMT]]>@axillent said:

this criteria has nothing to do with an official arduino pro mini :)
http://www.arduino.cc/en/Main/ArduinoBoardProMini

very true but it's a way.. and yes I used a lot of cloned nano's....

]]>https://forum.mysensors.org/post/14004https://forum.mysensors.org/post/14004Tue, 12 May 2015 20:05:44 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Tue, 12 May 2015 16:15:33 GMT]]>@Alco-van-Neck said:

Oh en not 100% waterproof visual: all my 3.3 V arduino mini pro's do have a RED reset switch on it. the 5V arduino's got a white reset button

this criteria has nothing to do with an official arduino pro mini :)
http://www.arduino.cc/en/Main/ArduinoBoardProMini

]]>https://forum.mysensors.org/post/13983https://forum.mysensors.org/post/13983Tue, 12 May 2015 16:15:33 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Tue, 12 May 2015 12:11:37 GMT]]>Oh en not 100% waterproof visual: all my 3.3 V arduino mini pro's do have a RED reset switch on it. the 5V arduino's got a white reset button

ebay 3.3 arduino with red button
ebay 5v white button

]]>https://forum.mysensors.org/post/13971https://forum.mysensors.org/post/13971Tue, 12 May 2015 12:11:37 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Tue, 12 May 2015 04:23:45 GMT]]>if you can recognize the marking on xtal you will find 5v with 16Mhz and 3.3V with 8mhz

]]>https://forum.mysensors.org/post/13939https://forum.mysensors.org/post/13939Tue, 12 May 2015 04:23:45 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Tue, 12 May 2015 04:10:03 GMT]]>Power them on the "raw" pin with 9V or something. Then measure the voltage on the Vcc pin. If it measures 5V it is a 5V board and if it measures 3.3V it is a 3.3V board.

]]>https://forum.mysensors.org/post/13938https://forum.mysensors.org/post/13938Tue, 12 May 2015 04:10:03 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Tue, 12 May 2015 00:03:59 GMT]]>you can also see the output on board.
if it stays 5V it's 5V and 3.3V... just guess ;-)

]]>https://forum.mysensors.org/post/13930https://forum.mysensors.org/post/13930Tue, 12 May 2015 00:03:59 GMT<![CDATA[Reply to How can I tell if my arduino mini pro is 3.3V or 5v? on Mon, 11 May 2015 23:33:35 GMT]]>Measure the voltage between Vcc and ground while powered by USB.

The output will be either 5V or3V3.

]]>https://forum.mysensors.org/post/13929https://forum.mysensors.org/post/13929Mon, 11 May 2015 23:33:35 GMT