Hello,
Looking on the internet I was not able to find answer to this...
I have followed this tutorial to have a standalone arduino on breadboard: http://arduino.cc/en/Main/Standalone.
Currently I use, as power supply, my Arduino UNO connecting directly the 5V and GND to the breadboard + and - (ignoring the 5V regulator on the tutorial).
I'm wondering if I can power supply the breadboard using 3.3V instead. Are there any side effects, or it is going to work?
I think that doing this also the serial connection and outputs will work at 3.3V, is it correct? Can I than connect it to another device with 3.3V serial interface?
If the Arduino is at 5V and breadboard at 3.3 you probably will need level shifters for the signals - 3.3V devices wont tolerate 5V and no device should have a logic input outside its supply range.
The ATmega chips will usually work at 16MHz at 3.3V at 25C, but you have no guarantee
d82k:
I'm wondering if I can power supply the breadboard using 3.3V instead. Are there any side effects, or it is going to work?
I think that doing this also the serial connection and outputs will work at 3.3V, is it correct? Can I than connect it to another device with 3.3V serial interface?
It will work, but not at 16MHz. The datasheet has a graph of maximum clock speed vs. voltage.
I have read a bit on the internet, and, if I have well understood, I can use the seme circuit of the tutorial just substituting the crystal 16mhz with one at 8 and the circuit should be good. Any other change to the capacitor or other components is needed?
Than I should change the bootloader using the one "Arduino Pro or Pro Mini (3.3V 8MHz) with atmega328" and my arduino on the breadboard should work at 3.3v right?
I have read a bit on the internet, and, if I have well understood, I can use the seme circuit of the tutorial just substituting the crystal 16mhz with one at 8 and the circuit should be good. Any other change to the capacitor or other components is needed?
Than I should change the bootloader using the one "Arduino Pro or Pro Mini (3.3V 8MHz) with atmega328" and my arduino on the breadboard should work at 3.3v right?