Cap touch on an Arduino Uno

// Cap touch: draw on the 2.8 inch ILI9341 with its FT6206 capacitive touch
// panel, the Adafruit way.
//
//   display   CS -> 10   DC -> 9   RST -> 8   MOSI -> 11   SCK -> 13   LED -> 5 V
//   touch     SCL -> A5   SDA -> A4
//
// Press on the picture while it runs, and drag.
//
// The display is an SPI device and the touch controller an I2C one, so the
// two never share a wire. The FT6206 reports the point in pixels of the
// glass, but its film is laminated the other way up from the display's
// memory, so the first thing the sketch does with a point is turn it round:
// the two map() lines, straight from Adafruit's example.

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <Adafruit_FT6206.h>

Adafruit_ILI9341 tft(10, 9, 8);
Adafruit_FT6206 ctp;

void setup() {
  Serial.begin(9600);
  tft.begin();
  tft.fillScreen(ILI9341_BLACK);
  if (!ctp.begin(40)) {
    Serial.println("Couldn't start FT6206 touchscreen controller");
    while (1) {
    }
  }
  Serial.println("Capacitive touchscreen started");
}

void loop() {
  if (!ctp.touched()) return;
  TS_Point p = ctp.getPoint();
  // Flip it around to match the screen.
  p.x = map(p.x, 0, 240, 240, 0);
  p.y = map(p.y, 0, 320, 320, 0);
  tft.fillCircle(p.x, p.y, 3, ILI9341_YELLOW);
  Serial.print("touch ");
  Serial.print(p.x);
  Serial.print(" ");
  Serial.println(p.y);
  delay(50);
}