how to output 3.3 volts in atmega328p?

I want the atmega328p to output 3.3 volts on the pin, when i use the digitalWrite function in arduino.Will it be possible if i use 3.3 volts to power the microcontroller rather than 5 volts. PS in the datasheet it says that the microcontroller operates in the range of 1.8 volts to 5.5 volts.

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Robert Peter Oakes over 9 years ago +2

An Arduino UNO is designed to work at 5V, you would need to change components to get it to work at 3V3 including the Crystal (Lower Voltage = Lower Speed) two diodes in series or a resistor divider would…
mcb1 over 9 years ago +1

Some boards have a 5v/3v3 switch option. This allows the whole board to work at 3v3 rather than 5v. This may an option. Mark
ravi_butani over 9 years ago +1

U can put atmega328 on breadboard and use it with 3.3V supply on VCC and AVCC pins of Atmega328 Better option is If you want to use 3.3V logic on any pin of arduino, just put resistor divider network on…

Robert Peter Oakes over 9 years ago

An Arduino UNO is designed to work at 5V, you would need to change components to get it to work at 3V3 including the Crystal (Lower Voltage = Lower Speed)

two diodes in series or a resistor divider would work if only used for output.

the other option is a level shifter like this SN74LVC245ADWR - TEXAS INSTRUMENTS - IC, 74LVC, SMD, 74LVC245, SOIC20 | Farnell element14
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mcb1 over 9 years ago

Some boards have a 5v/3v3 switch option.
This allows the whole board to work at 3v3 rather than 5v.

This may an option.

Mark
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ravi_butani over 9 years ago

U can put atmega328 on breadboard and use it with 3.3V supply on VCC and AVCC pins of Atmega328
Better option is If you want to use 3.3V logic on any pin of arduino, just put resistor divider network on that pin to drop 5V to 3.3V logic output also without any voltage divider arduino digital pin as input consider 3.3V as HIGH Logic..
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