I buy protoboard from Ebay sellers. It takes 9-29 days to arrive from China. Sometimes a lot longer.
Most things are available from European Ebay sellers too. They cost more money but arrive quicker.
Yes, I play with things on a desk. I prefer to plug a shield onto an existing Arduino-style board.
If you want to fit something in a car, you have to squeeze it into a particular hole.
Regarding resistors. You do not need them if your Arduino is running at 3.3V
If your Arduino is 5V, you must translate the 5V logic to 3.3V. Either with resistors or special chips. Series resistors will "work" but are not ideal because you backfeed voltage via the substrate diodes. Potential divider with 2 resistors is better.
I have the same Display with my Leonardo, but I can´t get it to work. Not with normal Pins, not with Hardware SPI Pins. Not with Your code, not with the aditional Definition of the Leonardo Pins:
// This sketch tests a function to draw elliptical (or circular) arcs
// of a defined width
#include <TFT_ILI9341.h> // Hardware-specific library
#include <SPI.h>
TFT_ILI9341 tft = TFT_ILI9341(); // Invoke custom library
#define DEG2RAD 0.0174532925
#define cs 7
#define dc 0
#define rst 1
unsigned long td = 0;
void setup(void) {
Serial.begin(115200);
delay(4000);
tft.begin();
tft.setRotation(1);
tft.fillScreen(ILI9341_BLACK);
}
void loop() {
int w = 12;
int rx = 160;
int ry = 100;
td = millis();
for (int n = 0; n < 5; n++) {
fillArc(160, 100, 300, 20, rx-n*w, ry-n*w, w, 31-n*6);
}
Serial.println(millis()-td);
while(1);
}
// #########################################################################
// Draw a circular or elliptical arc with a defined thickness
// #########################################################################
// x,y == coords of centre of arc
// start_angle = 0 - 359
// seg_count = number of 3 degree segments to draw (120 => 360 degree arc)
// rx = x axis radius
// ry = y axis radius
// w = width (thickness) of arc in pixels
// colour = 16 bit colour value
// Note if rx and ry are the same then an arc of a circle is drawn
int fillArc(int x, int y, int start_angle, int seg_count, int rx, int ry, int w, unsigned int colour)
{
byte seg = 6; // Segments are 3 degrees wide = 120 segments for 360 degrees
byte inc = 6; // Draw segments every 3 degrees, increase to 6 for segmented ring
// Calculate first pair of coordinates for segment start
float sx = cos((start_angle - 90) * DEG2RAD);
float sy = sin((start_angle - 90) * DEG2RAD);
uint16_t x0 = sx * (rx - w) + x;
uint16_t y0 = sy * (ry - w) + y;
uint16_t x1 = sx * rx + x;
uint16_t y1 = sy * ry + y;
// Draw colour blocks every inc degrees
for (int i = start_angle; i < start_angle + seg * seg_count; i += inc) {
// Calculate pair of coordinates for segment end
float sx = cos((i + seg - 90) * DEG2RAD);
float sy = sin((i + seg - 90) * DEG2RAD);
uint16_t x2 = sx * (rx - w) + x;
uint16_t y2 = sy * (ry - w) + y;
uint16_t x3 = sx * rx + x;
uint16_t y3 = sy * ry + y;
tft.fillTriangle(x0, y0, x1, y1, x2, y2, colour);
tft.fillTriangle(x1, y1, x2, y2, x3, y3, colour);
// Copy segment end to sgement start for next segment
x0 = x2;
y0 = y2;
x1 = x3;
y1 = y3;
}
}
