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This document describes an Arduino code for a water heater controller system. It includes libraries for an LCD display, real-time clock (RTC), and EEPROM memory. It defines pins for LED indicators, a relay, and buttons to adjust the temperature setpoint. The setup function initializes the display, RTC, and pins. The main loop reads the temperature sensor, updates the display, checks for button presses to adjust the setpoint, and uses the RTC to control a relay based on the time and comparing the temperature to the setpoint.

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Hammad Khan
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28 views3 pages

Code

This document describes an Arduino code for a water heater controller system. It includes libraries for an LCD display, real-time clock (RTC), and EEPROM memory. It defines pins for LED indicators, a relay, and buttons to adjust the temperature setpoint. The setup function initializes the display, RTC, and pins. The main loop reads the temperature sensor, updates the display, checks for button presses to adjust the setpoint, and uses the RTC to control a relay based on the time and comparing the temperature to the setpoint.

Uploaded by

Hammad Khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
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#include <LiquidCrystal.

h>
#include <Wire.h>
#include <RTClib.h>
#include <EEPROM.h>
#include <Adafruit_I2CDevice.h>

RTC_DS3231 rtc; // Create an RTC object

LiquidCrystal lcd(9, 8, 7, 6, 5, 4);

const int LED_RED = 13; // Red LED


const int LED_GREEN = 11; // Green LED
const int RELAY = 12; // Lock Relay or motor

// Key connections with Arduino


const int up_key = 3;
const int down_key = 2;

int SetPoint = 30;

//=================================================================
// SETUP
//=================================================================
void setup() {
pinMode(LED_RED, OUTPUT);
pinMode(LED_GREEN, OUTPUT);
pinMode(RELAY, OUTPUT);
pinMode(up_key, INPUT);
pinMode(down_key, INPUT);

// Pull up for setpoint keys


digitalWrite(up_key, HIGH);
digitalWrite(down_key, HIGH);

// set up the LCD's number of columns and rows:


lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("GYSER SYSTEM");
lcd.setCursor(0, 1); // Move cursor to the second line
lcd.print(" CONTROLLER ");
digitalWrite(LED_GREEN, HIGH); // Green LED Off
digitalWrite(LED_RED, LOW); // Red LED On
digitalWrite(RELAY, LOW); // Turn off Relay
delay(2000);

// Initialize the RTC


if (!rtc.begin()) {
lcd.clear();
lcd.print("Couldn't find RTC");
while (1);
}

if (rtc.lostPower()) {
lcd.clear();
lcd.print("RTC lost power, let's set the time!");
rtc.adjust(DateTime(F(_DATE), F(TIME_)));
}
}
//=================================================================
// Function to control the heater
//=================================================================
void controlHeater(bool turnOn) {
if (turnOn) {
digitalWrite(RELAY, HIGH); // Turn on heater
digitalWrite(LED_GREEN, LOW);
digitalWrite(LED_RED, HIGH); // Turn on RED LED
} else {
digitalWrite(RELAY, LOW); // Turn off heater
digitalWrite(LED_RED, LOW);
digitalWrite(LED_GREEN, HIGH); // Turn on Green LED
}
}

//=================================================================
// LOOP
//=================================================================
void loop() {
DateTime now = rtc.now(); // Get the current time from the RTC module

double Temperature = ((5.0 / 1024.0) * analogRead(A0)) * 100; // 10mV per degree


0.01V/C. Scaling

lcd.setCursor(0, 0);
lcd.print("Temperature:"); // Do not display entered keys
lcd.print(Temperature);

// Get user input for setpoints


if (digitalRead(down_key) == LOW) {
if (SetPoint > 0) {
SetPoint--;
}
}
if (digitalRead(up_key) == LOW) {
if (SetPoint < 150) {
SetPoint++;
}
}

// Display Set point on LCD


lcd.setCursor(0, 1);
lcd.print("Set Point:");
lcd.print(SetPoint);
lcd.print("C ");

// Check if the current time is within the desired range (from 12 AM to 6 AM)
if (now.hour() >= 5 && now.hour() < 6) {
// Turn on the heater if the temperature is below the set point
if (Temperature < SetPoint) {
controlHeater(true); // Turn on heater
} else {
controlHeater(false); // Turn off heater
}
} else {
// During other hours, turn off the heater
controlHeater(false); // Turn off heater
}
delay(100); // Update every 100 milliseconds
}

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