Hi! I'm trying to set up a temperature controller with start/stop/set values and the display is fluctuating between the 4 settings. Please take a look at the circuit below with the code and let me know the issue.
Please let me know!
Below is the code:
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal.h>
#include<EEPROM.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
int add_chk = 0;
int check_val = 10;
int c_temp = 0;
int c_temp_add = 1;
int f_temp = 0;
int f_temp_add = 2;
int set = A3, dec = A2, inc = A1, stsp = A0;
int numberOfDevices;
int relay = 8;
int buzzer = 9;
int val_tol = 0;
bool exit_stsp = false;
bool exit_set = false;
bool buz = true;
bool re_heat = false;
#define ONE_WIRE_BUS 10 // Pin no
#define TEMPERATURE_PRECISION 12 // 12-bit resolution
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
DeviceAddress tempDeviceAddress;
//------- Temperature tolerance -------//
const int tol = 3; // in degree Celsius
//-----------------------------------//
void setup(void)
{
lcd.begin(16, 2);
sensors.begin();
pinMode(stsp, INPUT_PULLUP);
pinMode(inc, INPUT_PULLUP);
pinMode(dec, INPUT_PULLUP);
pinMode(set, INPUT_PULLUP);
pinMode(relay, OUTPUT);
pinMode(buzzer, OUTPUT);
digitalWrite(relay, LOW);
digitalWrite(buzzer, LOW);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(" Water Heater");
lcd.setCursor(0, 1);
lcd.print(" Controller");
numberOfDevices = sensors.getDeviceCount();
if (EEPROM.read(add_chk) != check_val)
{
EEPROM.write(add_chk, check_val);
EEPROM.write(c_temp_add, 50);
f_temp = f_conv(50);
EEPROM.write(f_temp_add, f_temp);
c_temp = EEPROM.read(c_temp_add);
f_temp = EEPROM.read(f_temp_add);
}
else
{
c_temp = EEPROM.read(c_temp_add);
f_temp = EEPROM.read(f_temp_add);
}
delay(1500);
}
void loop(void)
{
lcd.setCursor(0, 0);
lcd.print("PRESS START/SET");
lcd.setCursor(0, 1);
lcd.print("TEMP: ");
lcd.print(EEPROM.read(c_temp_add));
lcd.print("C/");
lcd.print(EEPROM.read(f_temp_add));
lcd.print("F");
if (digitalRead(set) == LOW && exit_set == false)
{
exit_set = true;
c_temp = EEPROM.read(c_temp_add);
f_temp = EEPROM.read(f_temp_add);
while (exit_set)
{
if (digitalRead(inc) == LOW)
{
c_temp += 1;
if (c_temp > 110) c_temp = 0;
f_temp = f_conv(c_temp);
delay(50);
}
if (digitalRead(dec) == LOW)
{
c_temp -= 1;
if (c_temp < 0) c_temp = 110;
f_temp = f_conv(c_temp);
delay(50);
}
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("SET TEMPERATURE:");
lcd.setCursor(0, 1);
lcd.print(" ");
lcd.print(c_temp);
lcd.print("C/");
lcd.print(f_temp);
lcd.print("F");
delay(150);
if (digitalRead(set) == LOW)
{
delay(500);
if (digitalRead(set) == LOW)
{
exit_set = false;
if (EEPROM.read(c_temp_add) == c_temp)
{
lcd.clear();
lcd.print("VALUE UNCHANGED!");
delay(1500);
}
else
{
EEPROM.write(c_temp_add, c_temp);
EEPROM.write(f_temp_add, f_temp);
lcd.clear();
lcd.print(" VALUE SAVED!");
lcd.setCursor(0, 1);
lcd.print("****************");
delay(1500);
lcd.clear();
}
}
}
}
}
if (digitalRead(stsp) == LOW && exit_stsp == false)
{
exit_stsp = true;
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("SET: ");
lcd.print(EEPROM.read(c_temp_add));
lcd.print("C/");
lcd.print(EEPROM.read(f_temp_add));
lcd.print("F");
buzz();
digitalWrite(relay, HIGH);
while (exit_stsp)
{
sensors.requestTemperatures();
for (int i = 0; i < numberOfDevices; i++)
{
if (sensors.getAddress(tempDeviceAddress, i))
{
printTemperature(tempDeviceAddress);
}
}
lcd.setCursor(0, 1);
lcd.print("WATER: ");
lcd.print(c_temp);
lcd.print("C/");
lcd.print(f_temp);
if (f_temp < 100)
{
lcd.print("F ");
}
else
{
lcd.print("F");
}
if (c_temp >= EEPROM.read(c_temp_add) && buz == true)
{
delay(5000);
if (c_temp >= EEPROM.read(c_temp_add))
{
digitalWrite(relay, LOW);
buz = false;
re_heat = true;
for (int j = 0; j < 15; j++)
{
digitalWrite(buzzer, HIGH);
delay(100);
digitalWrite(buzzer, LOW);
delay(100);
}
}
}
val_tol = EEPROM.read(c_temp_add) - tol;
if (c_temp <= val_tol && re_heat == true)
{
buz = true;
re_heat = false;
digitalWrite(relay, HIGH);
}
if (digitalRead(stsp) == LOW && exit_stsp == true)
{
delay(1500);
if (digitalRead(stsp) == LOW)
{
digitalWrite(relay, LOW);
exit_stsp = false;
lcd.clear();
lcd.print("PROCESS STOPPED!");
lcd.setCursor(0, 1);
lcd.print("****************");
buzz();
delay(500);
lcd.clear();
break;
}
}
}
}
}
int f_conv(int x)
{
int temp;
temp = x * 9;
temp = temp / 5;
temp = temp + 32;
return temp;
}
void printTemperature(DeviceAddress deviceAddress)
{
c_temp = sensors.getTempC(deviceAddress);
f_temp = f_conv(c_temp);
}
void buzz(void)
{
digitalWrite(buzzer, HIGH);
delay(1000);
digitalWrite(buzzer, LOW);
}
