How Can I Tell If My Arduino Mini Pro Is 3.3V Or 5v? - MySensors Forum

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How can I tell if my arduino mini pro is 3.3V or 5v?

How can I tell if my arduino mini pro is 3.3V or 5v? Scheduled Pinned Locked Moved Hardware 11 Posts 9 Posters 12.7k Views 3 Watching Oldest to Newest Reply Log in to reply This topic has been deleted. Only users with topic management privileges can see it.

J Offline J Offline joaoabs wrote on last edited by #1
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
1 Reply Last reply 0
B Offline B Offline BulldogLowell Contest Winner wrote on last edited by #2
Measure the voltage between Vcc and ground while powered by USB.

The output will be either 5V or3V3.
D 1 Reply Last reply 0
A Offline A Offline andriej wrote on last edited by #3
you can also see the output on board. if it stays 5V it's 5V and 3.3V... just guess ;-)

:-)
1 Reply Last reply 0
K Offline K Offline korttoma Hero Member wrote on last edited by #4
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.
- Tomas
1 Reply Last reply 0
A Offline A Offline axillent Mod wrote on last edited by #5
if you can recognize the marking on xtal you will find 5v with 16Mhz and 3.3V with 8mhz

sense and drive
1 Reply Last reply 3
A Offline A Offline Alco van Neck wrote on last edited by #6
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
A A 2 Replies Last reply 0
A Alco van Neck
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
A Offline A Offline axillent Mod wrote on last edited by #7
@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

sense and drive
A 1 Reply Last reply 0
A axillent
@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
A Offline A Offline Alco van Neck wrote on last edited by #8
@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....
1 Reply Last reply 0
B BulldogLowell
Measure the voltage between Vcc and ground while powered by USB.

The output will be either 5V or3V3.
D Offline D Offline DrJeff wrote on last edited by #9
@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.
1 Reply Last reply 0
A Alco van Neck
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
A Offline A Offline Alexandre Magno wrote on last edited by #10
@Alco-van-Neck said:

ebay 5v white button

I am searching the schematic of this board. Someone here have it?
N 1 Reply Last reply 0
A Alexandre Magno
@Alco-van-Neck said:

ebay 5v white button

I am searching the schematic of this board. Someone here have it?
N Offline N Offline NickBuilder wrote on last edited by #11
@Alexandre-Magno

Hi!

Look here: https://www.arduino.cc/en/Main/ArduinoBoardProMini Check the documentation/schematics section.
1 Reply Last reply 0