#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define TFT_CS    10
#define TFT_DC    8
#define TFT_RST   9

int xValue = 0 ;
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

void setup() {
  pinMode(A5, INPUT);
  Serial.begin(9600);
  tft.begin();
  tft.setRotation(3);
}

void plotGraph() {
  tft.fillScreen(ILI9341_BLACK); // Clear the screen

  // Draw X-axis
  tft.drawLine(0, tft.height() / 2, tft.width(), tft.height() / 2, ILI9341_WHITE);

  // Draw Y-axis
  tft.drawLine(tft.width() / 2, 0, tft.width() / 2, tft.height(), ILI9341_WHITE);

  // Calculate the center of the screen
  int centerX = tft.width() / 2;
  int centerY = tft.height() / 2;

  // Number of data points to read
  const long numPoints = 1022;

  // Read and plot data
  for (int i = 0; i < numPoints; ++i) {
    // Read X and Y values from analog pins
    
    xValue = xValue + 1 ;
    
    int yValue = analogRead(A5);   // voltage value
    int aValue = yValue * (5.0 / 1023.0); // current value

    // Map and shift the values
    int xMapped = map(xValue, 0, 1023, -centerX, centerX);
    int yMapped = map(yValue, 0, 1023, centerY, -centerY);
    

    // Shift the points to start from the center
    int xPlot = centerX + xMapped;
    int yPlot = centerY - yMapped;
    // Draw a point at the current position
    tft.drawPixel(xPlot, yPlot, ILI9341_GREEN);

    // Add a delay to slow down the plot (adjust as needed)

    delay(50);
  }
}

void loop() {
  
  plotGraph();
  // Delay for 5 seconds before clearing the graph
}