Arduino mega 2560 tx and rx at 3.3v

Development Tools IDE 1.x
1

Hi there, i need to connect a generic wifi shield that works at 3.3v to an arduino mega 2560 r3, but i ve been told that the shield only works at 3.3volt as for power and for data serial communication, but i can't find on the arduino documentation if it is possible to use the serials at that voltage, does anyone knows if this is possible?

Thanks in advance.

Juan

2

3.3V is higher then the 3V minimum needed for a valid high input at Rx.
Arduino Tx output will be 5V, up to you to reduce that to 3.3V, with resistor voltage divider for example.

3

Cross thanks for the response i am quite new to arduino and have little knowledge of electronic, using resistor might cause any issue?

Thanks

Juan

4

Two resistors:

3.3Vout.jpg
3.3Vout.jpg960×720 31.7 KB

5

Thanks i will try it!

Juan