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How far from the UNO can I place an LCD (the typical 16x2)? Assuming that everything that is plugged into the LCD comes directly from the Arduino (power and data).

I'd like to mount the LCD on the wall at eye level, my "box" will be on the floor, close to a power source.

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    Sounds like you are talking 6 feet or so? That should be fine, I have found that I2C starts needing extenders around 10 feet or so. If you can slow the data rate down that would help as well.
    – Chad G
    Apr 11 '18 at 20:33
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The actual distance depends highly on several other factors:

  • Wire thickness / current carrying capacity / resistance
  • RFI (Radio Frequency Interference) environment
  • Data rate that you write to the LCD (Maybe you are using an I2C or SPI backpack)

In general, even 5 meters is probably going to work if you use sufficient wiring, but try it and see.

You may also need to add shielding to mitigate RFI.

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