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Re^3: i2c lcd Custom Characters

by jmlynesjr (Hermit)
on Jun 11, 2016 at 19:09 UTC ( #1165404=note: print w/replies, xml ) Need Help??


in reply to Re^2: i2c lcd Custom Characters
in thread i2c lcd Custom Characters

I don't have an RPI but it sounds similar to the Fubarino Mini which has about 1/2 of it's pins 5v tolerant, which also includes the I2C pins. The UNO32/uC32 is a 5v tolerant board at twice the size and a few dollars more expensive.

James

There's never enough time to do it right, but always enough time to do it over...

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Re^4: i2c lcd Custom Characters
by anita2R (Beadle) on Jun 11, 2016 at 20:01 UTC

    James

    As far as I know, none of the Pi's pins are 5 volt tolerant, it is only when configured and used with the i2c bus that they are tolerant.

    If these same pins were reconfigured to general purpose use, they would not be 5 volt tolerant.

    I think that the issue is the way that the i2c bus operates and how it is pulled up/down.

    anita2R

      anita2R

      Thanks for the info. Something to pay attention to if I ever decide to play with the RPI. It's starting to become popular in Ham radio circles.

      The Digilent docs state that the PIC32 digital I/O pins are protected but the analog I/O pins are not. Digilent adds protection diodes for the analog pins on their UNO32/uC32 boards.

      James

      There's never enough time to do it right, but always enough time to do it over...

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