#include "U8glib.h"

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST); // Fast I2C / TWI

int progress = 0;

int potentio = 0;
char buffer [20];
int string_width;


void setup() {
  pinMode(A0, INPUT);
  
  u8g.setFont(u8g_font_tpssb);
  u8g.setColorIndex(1);
}

void loop() {
  progress = analogRead(A0);


  dtostrf(potentio/10.0,1,1,buffer);
  sprintf(buffer,"%s%s", buffer, "°C");
  potentio = map(analogRead(A0),0,1023,-200,1200);
  
  u8g.firstPage(); 
  do {
    u8g.drawStr(40, 10, "COOLANT");                         // main name

    string_width=u8g.getStrWidth(buffer);                   //value
    u8g.drawStr(64-string_width/2,30,buffer);               //value 


    u8g.drawFrame(15,39,100,15);                            //box for progress bar 
    u8g.drawBox(15, 39, map(progress,0,1023,0,100), 15);    // progress bar filling


  } while ( u8g.nextPage() );

  
}