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are there any USB to TTL with switchable 5v and 3.3v

i need to use it for raspberry pi and arduino

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Many 3.3V FTDI based devices are 5V tolerant and will work with both:

Here is general information about logic levels: https://learn.sparkfun.com/tutorials/logic-levels

  • so the HIGH for arduino is 3v to 5v and LOW is 0v to 1.5v , can i used USB to 3.3v TTL for both arduino and RPI – user3805290 Feb 18 '15 at 19:29
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    Yes, in general 3.3V logic output is compatible with 5V input. Some, but not all 3.3V devices are tolerant of 5V input. Check the datasheets to be sure. Always be careful when combining 3.3V logic and 5V logic it is possible to damage components. – Craig Feb 18 '15 at 20:50

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