This is a simple plotting example to experiment with the TFT Library and the LCD Display with the ST7735 controller (128×160 pixels).

simple_graph_01_4

First, a clean wiring diagram to connect the Arduino NANO and the Display. The SD Card adapter was wired  (CS and MISO) but not used in this Sketch.

tft_sd_nano_dim_wiring

Then, a wiring plan to put them together in the breadboard:

tft_sd_nano_dim_jumpers

 

tft_sd_nano_dim_assembled

 

The Sketch:

/*TFT_Grap.ino Arduining 7 AUG 2016
*/

#include <TFT.h>
#include <SPI.h>

//pin definitions:
#define CS 10
#define DC 9
#define RST 8
#define BKLIGHT 6 // Backlight control pin

#define BRIGHTNESS 204 // Backlight intensity (0-255)
#define RANGE 100 // Vertical size of the graph in pixels.
#define WIDTH 128 // Horizontal size of Display in pixels.
#define HEIGHT 160 // Vertical size of Display in pixels.
#define PERSIST 500 // persistence of the graph (milliseconds).

TFT TFTscreen = TFT(CS, DC, RST);

int value ;
int last_value;
int x_pos= 0; // cursor position
int offset= 40; // vertical graph displacement in pixels.

void setup(){
TFTscreen.begin(); // initialize the display
TFTscreen.setRotation(0);
TFTscreen.background(0,128,0); // dark green background
TFTscreen.stroke(255,255,255); // white stroke
analogWrite(BKLIGHT,BRIGHTNESS); //Set brightness.
TFTscreen.setTextSize(1);
TFTscreen.text("Arduining.com",50,151);
drawFrame();
clearGraph();
}

void drawFrame(){
TFTscreen.stroke(255,255,255); // white stroke 
TFTscreen.fill( 255, 255, 255 ); // White fill
TFTscreen.rect(0, 0, WIDTH, 21);
TFTscreen.setTextSize(1);
TFTscreen.stroke(0,0,0); // black text
TFTscreen.text("Volts: 1.0V/Div",2,2); // Example text.
TFTscreen.text("Time: 10mS/Div",2,12); // Exanple text
}
void clearGraph(){
TFTscreen.stroke(127,127,127); // grey for the border
TFTscreen.fill( 180, 0, 0 ); // dark Blue for the background
TFTscreen.rect(0, 22, 128, 128);
TFTscreen.line(65, 23, 65, 151); // vertical line
TFTscreen.line(1, 85,127, 85); // horizontal line
TFTscreen.stroke(0,255,255); // yellow stroke for plotting.
}

void plotLine(int last,int actual){
if(x_pos==0)last= actual; // first value is a dot.
TFTscreen.line(x_pos-1, last, x_pos, actual); // draw line.
x_pos++;
if(x_pos > WIDTH){
x_pos=0;
delay(PERSIST);
clearGraph();
}
}

void loop(){
last_value= value;
value= analogRead(A0);
value= map(value,0,1023,149,23);
value -= offset;
if(value <= 23) value= 23; //truncate off screen values.
plotLine(last_value ,value );
delay(10);
}

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