/*
  ESP32 + ILI9341 LCD Basic Example

  https://wokwi.com/projects/325324981270479442
*/

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

#define TFT_DC 2
#define TFT_CS 15
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

//RPM settings
int xmax=240;             // max length x-axis
int ymax=240;             // max length y-axis
int xcenter=xmax/2;      // center of x-axis
int ycenter=ymax/2;      // center of y-axis
int arc=ymax/4;                                                              
int p, w, m,a=10;        // a= Needle Speed
int xx=0;   
int outlineThickness = 3;


void setup() {

  
  tft.begin();
/*
  tft.setCursor(20, 120);
  tft.setTextColor(ILI9341_RED);
  tft.setTextSize(3);
  tft.println("Hello ESP32");

  tft.setCursor(24, 160);
  tft.setTextColor(ILI9341_GREEN);
  tft.setTextSize(2);
  tft.println("I can do SPI :-)");
*/
  tft.fillCircle(xcenter, ycenter, arc, ILI9341_GREEN);
  tft.fillCircle(xcenter, ycenter, arc-outlineThickness, ILI9341_BLACK);

}



void gauge(uint8_t angle) {
    static float x1 = 0.0;
    static float y1 = 0.0;
    // Draw the Needle
    //erase previous line
    tft.drawLine(xcenter+(arc-20)*x1, ycenter-(arc-20)*y1, xcenter+(arc-outlineThickness)*x1, ycenter-(arc-outlineThickness)*y1, ILI9341_BLACK);
    
    


    x1=sin(2*angle*2*3.14/100);              // needle position
    y1=cos(2*angle*2*3.14/100);
    //draw new line
    tft.drawLine(xcenter+(arc-20)*x1, ycenter-(arc-20)*y1, xcenter+(arc-outlineThickness)*x1, ycenter-(arc-outlineThickness)*y1, ILI9341_WHITE);
    //tft.fillCircle(xcenter, ycenter, arc-20, ILI9341_BLACK);

  }


void loop() { 
  static uint16_t ADC_reading_prev;

  uint16_t ADC_reading = analogRead(32);
  if(ADC_reading != ADC_reading_prev){
    
    tft.fillRect(0, 0, 200, 40, ILI9341_BLACK);
    tft.setCursor(0, 00);
    tft.setTextColor(ILI9341_GREEN);
    tft.println(ADC_reading);


    gauge(ADC_reading/40);

    ADC_reading_prev = ADC_reading;
  }
  delay(10); }