#include <TVout.h>
#include <font8x8.h>

int coordx[] = {23, 23, 24, 24, 25, 26, 28, 30, 31, 34, 36, 38, 41, 44, 47, 50, 53, 56, 59, 62, 65, 68, 71, 74, 77, 80, 82, 84, 87, 88, 90, 92, 93, 94, 94, 95, 95};
int coordy[] = {78, 75, 72, 69, 66, 63, 60, 57, 55, 53, 50, 49, 47, 45, 44, 43, 43, 42, 42, 42, 43, 43, 44, 45, 47, 49, 50, 53, 55, 57, 60, 63, 66, 69, 72, 75, 78};
int coordix[] = {31, 35, 45, 59, 73, 83, 87};
int coordiy[] = {78, 64, 54, 50, 54, 64, 78};

TVout TV;

void setup()
{
  TV.begin(NTSC,120,96);
  TV.select_font(font8x8);
}

void loop()
{
  float volt;
  uint8_t an, n;
  
  TV.clear_screen();
  TV.println(23, 4, "Voltmeter");
  TV.draw_circle(59, 78, 36, WHITE);
  for(int i=0; i<7; i++)
    TV.draw_line(coordx[i * 6], coordy[i * 6], coordix[i], coordiy[i], WHITE);
    
  an = analogRead(A0);
  volt = an / 1023.0 * 5.0;
  TV.print(39, 24, volt);
  TV.print('V');
  n = 36 * an / 307; // 1023 ÷ 5 × 1.5 = 306.9
  if(n > 36)
    n = 36;
  TV.draw_line(59, 78, coordx[n], coordy[n], WHITE);

  TV.delay(1000);
}