#include < Wire.h >
#include < OneWire.h >
#include < DallasTemperature.h >
#include < Adafruit_GFX.h >
#include < Adafruit_SSD1306.h >
#include < SimpleTimer.h >
SimpleTimer timer;
float calibration_value = 21.34 - 1.61; //
int phval = 0;
unsigned long int avgval;
int buffer_arr[10], temp;
float ph_act;
// for the OLED display
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)