analogue dials with central tft display in stock
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The hardware setup is common to some of my other Instructables, it consists of the UNO, the 2.2" TFT display based on the ILI9341 driver chip and a set of libraries that are enhanced versions of the Adafruit GFX and ILI9341 libraries.
It is important to include the 1K8 resistors to GND with this 2.2" display as otherwise it will not work! The 1K2 and 1K8 resistors are a "potential divider", acting as a logic level shifter so that the logic level at the display is reduced from 5V to around 3V. Pin 9 of the display does not need to be connected up.
One video is the UTFT Demo running on a Mega board with a 16 bit parallel interface to the display. It is faster mostly because the 10,000 pixel plot test at the end has been changed so 30,000 16 bit random numbers do not need to be produced at the same time as plotting 10,000 pixels (generating 30,000 16 bit random values takes nearly 3 seconds so the UNO can really drive the display faster than it appears during that part of the test!)