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I have an Uno + WiFi 101 thermometer and I'd like to be able to take it places and easily change WiFi network SSIDs and passwords. Can I use a TFT screen to make these changes to a sktech or am I stuck using a PC and IDE for this kind of thing?

Can someone provide a sample sketch of what this might look like? I want to know it's something that's possible before I spend the money on a TFT.

It's possible (let's face it, LIKELY) that I fundamentally misunderstand the capabilities and limitations of the TFT screen. Sorry for the noobish question.

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    The screen is just a screen. You can do whatever you like with it.
    – Ignacio Vazquez-Abrams
    May 8, 2016 at 0:03
  • So...you can use it to modify sketches and not just view output?
    – acpilot
    May 8, 2016 at 0:05
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    If that's how you've written your sketch.
    – Ignacio Vazquez-Abrams
    May 8, 2016 at 0:05
  • That is encouraging. I hope that someone can provide more detail. My research continues.
    – acpilot
    May 8, 2016 at 0:12
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    All the TFT does is display things -- it's just a screen. What Ignacio is saying is that if you have written your sketch to be able to modify itself, then you can use the screen to display a user interface. The screen can't modify your sketch. Your sketch technically can modify itself, but it is very difficult to do so and would require a custom bootloader. It would be a lot easier to store the data that can be modified in EEPROM.
    – NobodyNada
    May 8, 2016 at 3:40

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A TFT screen is just a screen. You can't modify SSIDs and passwords with it, any more than you can by poking your PC monitor (unless perhaps you have a touch-screen*). To modify things you would need:

  • An input device (eg. a keypad)
  • A method of displaying what you are entering (this is where the screen would be handy)
  • A method of storing the new information. You could store things like passwords in EEPROM.
  • Code to make all that work.

* Some distributors sell touch-screen interfaces designed to go on top of screens - this might conceivably be what you are thinking of. However you still need the touch-screen, and code to make the touch-screen, and the TFT screen, work.

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