Colour GLCD for calculator project

[Maximilian Hohmann]

Hi!

(05-17-2019 03:11 AM)Dan Wrote:  Also, how do you find the performance of the higher resolution displays in general? Does it take a noticeable amount of time to refresh the screen? You certainly don't want the user waiting for the value entered on the command line to appear on the stack!

I don't think that's a problem. Of course these are not the state of the art daylight-readable instantaneous retina displays that Apple uses for their iPhones. But in my experience this kind of display is quicker than something like the original HP-48.

(05-17-2019 03:11 AM)Dan Wrote:  So if anyone knows of a quality 3.3V GLCD around 3.5 inches with parallel interface and SD card connection, please let me know!

Lady Ada has one matching your specs (even with a choice of parallel or serial connection) but only 3.2 inches: https://learn.adafruit.com/adafruit-2-do...2/overview
The good thing with Adafruit products is that their drivers and libraries are always up to date and match the hardware. With the cheap clones from China it can take some time to find a working library and to adjust all the necessary settings.

Regards
Max

Edit: There is also a 3.5in version of these displays, it is just not covered by the tutorial I linked above but should be just the same: https://www.adafruit.com/product/2050