how write temperature only one time on arduino eeprom

Projects Programming
1

Hi, im making a lcd thermometer with the ability of save the actual temperature on the eeprom.
when i press a button, it was designed to write in eeprom the actual temperature and print saved on lcd (all things was in portuguese on the code)
the problem is when i call eeprom.write, it writes the temperature for infinite.
here is the actual code, based on thermistor code found on arduino playground:

#include <LiquidCrystal.h>

#include <EEPROM.h>

#include <math.h>

int addr = 0;

int es = 0;

LiquidCrystal lc(12, 11, 5, 4, 3, 2);

double Thermister(int RawADC) {
 double Temp;
 Temp = log(((10240000/RawADC) - 10000));
 Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
 Temp = Temp - 273.15;            // Convert Kelvin to Celcius
 //Temp = (Temp * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit
 return Temp;
}

void setup() {
 lc.begin(16,2);
 lc.print("Temperatura");
 lc.setCursor(14,0);
 lc.print("oc");
 lc.setCursor(0,1);
 lc.print("2011");
 lc.print(" Allan");
}

void loop() {
 lc.setCursor(12,0);
 lc.print(int(Thermister(analogRead(0))));  // display Fahrenheit
 delay(100);
 es = digitalRead(A1);
 if (es == HIGH) { 
 EEPROM.write(addr, (int(Thermister(analogRead(0)))));
 
 lc.setCursor(0,1);
 lc.print("                ");
 lc.print("Salvo");
 delay(1000);
 lc.print("");
 lc.print("Allan");
 }
  addr = addr + 1;
  if (addr == 512)
    addr = 0;
  
  
}

Thanks

2

So, change it to only write if the temp changes?

What do you have connected to A1 that goes HIGH & LOW so that es goes High & Low?

3

A pushbutton is conected to A1, when i press it it was designed to write the actual temperature on eeprom but i dont know how to write the temperature on eeprom only when i press the button.
Thanks

4

A1 has a pulldown resistor and when you press the button it gets pulled high to +5?

5

CrossRoads:
A1 has a pulldown resistor and when you press the button it gets pulled high to +5?

yes.