Pages: [1]   Go Down
Author Topic: Arduino Uno with 3.3V I/O  (Read 649 times)
0 Members and 1 Guest are viewing this topic.
Germany
Offline Offline
Full Member
***
Karma: 1
Posts: 221
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello,

after having learnt that with a simple voltage divider, the Arduino Uno can have 3.3V output where I want, I am interested whether this works easier with simply connecting IOREF to 3V3.

As far as I know, supplying voltage to the IOREF pin changes the input/output reference which is normally 5V.
Then I connect, for example, D7 to the pin of some module that works with 3.3V.

Will that work, do I understand it in the right way?

Thank you
Logged

using Arduino Uno Rev 3

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 639
Posts: 34724
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
I am interested whether this works easier with simply connecting IOREF to 3V3.
No.

Quote
As far as I know, supplying voltage to the IOREF pin changes the input/output reference which is normally 5V.
No that is not how it works. It is simply an output that lets shields know what voltage it is running from.

Quote
do I understand it in the right way?
No.
Logged

Germany
Offline Offline
Full Member
***
Karma: 1
Posts: 221
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

oh,too bad.
Is there any pin that can be supplied some voltage to and thus changing the output of the pins to this voltage?
Logged

using Arduino Uno Rev 3

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 549
Posts: 27418
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

No. Pins will output at 5V if board is a 16 MHz  board.
There are other 8 MHz boards that run at 3.3V.
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Germany
Offline Offline
Full Member
***
Karma: 1
Posts: 221
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

ok,then I stick to the solution with voltage divider. thanks anyway
Logged

using Arduino Uno Rev 3

Pages: [1]   Go Up
Jump to: