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Topic: Arduino Uno with 3.3V I/O (Read 672 times) previous topic - next topic

karlok

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
using Arduino Uno Rev 3

Grumpy_Mike

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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.

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do I understand it in the right way?

No.

karlok

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?
using Arduino Uno Rev 3

CrossRoads

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

karlok

ok,then I stick to the solution with voltage divider. thanks anyway
using Arduino Uno Rev 3

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