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No, unfortunately there is nothing you can do to make the I/O pins on the UNO to 3.3V. By design the pins are 5V.And again, powering something at 5V if it is designed for 3.3V is a very bad idea....So you either use a couple of resistors (if you don't care about efficiency) or use a DC-DC converter. That is the best way.
WannaDuino,well don't get confused with the power input of the Arduino Uno (R3) which is 3.3V and the output pins (GPIO) which are 5V.You can power the ATmega328 with 3.3V but you cannot output 3.3V on the GPIO pins. This is valid 100% for the original Arduino Uno R3.However, there are Arduino clones with 3.3V GPIO out there, you might have one of them.Hope this help!Regards,Paolo
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Thanks for the instructable.Do you have a list of materials and cost?Thanks!
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Not the best idea to connect the I/O pins directly to 5V.It might work, bu you might significantly shorten the life of the components.The BT chip is *NOT* 5V tolerant:https://cdn.sparkfun.com/datasheets/Wireless/Bluet...
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