(Written by David Perbal)
As I said in the previous post, the 2.8” touchscreen is too small. And its resistive touch isn’t responsive enough.
On the picture below the top left one is the “old” 2.8” resistive touch display.
So I had to test new capacitive touchscreens :
- 2.8″ 320*240 pixels, ratio 4:3 (bottom left)
- 3.2″ 320*240 pixels, ratio 4:3 (the one in the middle, fitted into my MicroDexed Touch)
- 3.5″ 480*320 pixels, ratio 3:2 (right)
To give an idea of the pixels gained with the 3.5” resolution 480 * 320 compared to the 320 * 240 pixels :
After a little poll between us, we decided to go bigger. So I bought a 4″ capacitive screen (480*320 pixels, ratio 3:2) to have more space. The code for this new type of display needed new libraries for the new drivers (ST7796 for display and FT6206 for touch) and some rewiring. Fortunately Paul had anticipated everything and exposed pins for both the microcontroller and the display on the PCB so it was an easy fix.
This time the display was too big to fit between the encoders, so I desoldered the left encoder…
Now we have a comfortable display, with responsive touch 🙂
To be continued…
David