Just wanted to say thank you to all who answered my questions and/or gave guidance.
@WAWA, @Paul__B, @Larryd, and many others.
attached are pictures of my project... it works great. After many test runs and hours, it works great. I even tested over night.
code
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
// Pins
int TR_PIN = A1; // Thermistor
int SetPin = A3 ; // Pot
int LED_B = 9; // PWM capable
int LED_G = 10; // PWM capable
int LED_R = 11; // PWM capable
int relayPin = 3; // PWM capable
const byte relaySensor = 4; //
const byte button = 2; // toggle switch
// Constants
int SensorTimer = 7000; // 7 seconds
//Variables
int sensorVal;
int setVal;
int sensorTemp;
int setTemp;
int tempDiffPos;
int tempDiffNeg;
int count;
int sensorCount;
int MainsPollVal;
int MainsPollValA;
bool State;
float realTemp;
float trueTemp;
double a1, b1, c1, d1, r2, r1, vo, tempC, tempF, tempK;
unsigned long TimeNow;
unsigned long LastTime;
void setup() {
// put your setup code here, to run once:
lcd.begin(16, 2);
Serial.begin(9600);
pinMode(LED_B, OUTPUT);
pinMode(LED_G, OUTPUT);
pinMode(LED_R, OUTPUT);
pinMode(SetPin, INPUT);
pinMode(relayPin, OUTPUT);
pinMode(relaySensor, INPUT);
pinMode(button, INPUT);
pinMode(TR_PIN, INPUT);
a1 = 3.354016E-03 ;
b1 = 2.569850E-04 ;
c1 = 2.620131E-06 ;
d1 = 6.383091E-08 ;
r1 = 9720.0;
tempDiffPos = 0.00;
tempDiffNeg = 0.00;
}
// MAIN LOOP
void loop() {
while ((setTemp == 0) && (digitalRead(button) == LOW)) {
Start_Up();
}
while (digitalRead(button) == HIGH) {
count = 0;
MainsPollVal = 0;
MainsPollValA = 0;
SetTempVal();
}
// show state ture
if (State == true) {
lcd.setCursor(0, 1);
lcd.print("^");
}
// check sensor
TimeNow = millis();
if (LastTime <= TimeNow - SensorTimer) {
sensorPoll();
LastTime = TimeNow;
Serial.print(State);
}
tempDiffPos = (trueTemp - setTemp);
tempDiffNeg = (setTemp - trueTemp);
while ((MainsPollVal == 10) || (MainsPollVal - MainsPollValA == 10)) {
MainsPollValA = MainsPollVal;
Fault();
if (digitalRead(button) == HIGH) {
break;
}
}
// COOLING
while ((trueTemp - setTemp >= 0) && (State == true)) {
digitalWrite(relayPin, HIGH);
// digitalWrite(LED_B, HIGH);
digitalWrite(LED_G, LOW);
digitalWrite(LED_R, LOW);
delay(25);
Display();
MainsCheck();
Fade_Blue();
// check sensor
TimeNow = millis();
if (LastTime <= TimeNow - SensorTimer) {
sensorPoll();
LastTime = TimeNow;
Serial.print(State);
}
if (digitalRead(button) == HIGH) {
break;
}
if (setTemp - trueTemp >= 0) {
digitalWrite(relayPin, LOW);
MainsPollVal = 0;
MainsPollValA = 0;
State = false;
lcd.clear();
break;
}
if ((MainsPollVal == 10) || (MainsPollVal - MainsPollValA == 10)) {
MainsPollValA = MainsPollVal;
Fault();
break;
}
}
//GOOD TEMP
while ((((setTemp - trueTemp > 0) && (setTemp - trueTemp < 1.75)) || ((trueTemp - setTemp > 0) && (trueTemp - setTemp < 1.75))) && (State == false)) {
// digitalWrite(LED_G, HIGH);
digitalWrite(LED_B, LOW);
digitalWrite(LED_R, LOW);
digitalWrite(relayPin, LOW);
Display();
Fade_Green();
// check sensor
TimeNow = millis();
if (LastTime <= TimeNow - SensorTimer) {
sensorPoll();
LastTime = TimeNow;
Serial.print(State);
}
if (digitalRead(button) == HIGH) {
break;
}
if (trueTemp - setTemp > 1.6) {
State = true;
break;
}
}
// HIGH SET TEMP
if (setTemp - trueTemp > 1.75) {
// digitalWrite(LED_R, HIGH);
digitalWrite(LED_B, LOW);
digitalWrite(LED_G, LOW);
digitalWrite(relayPin, LOW);
// State = false;
Fade_Red();
}
}
//StartUP
void Start_Up() {
lcd.setCursor(0, 0);
lcd.print(" ! Mmmmmmmm ! ");
lcd.setCursor(0, 1);
lcd.print(" KOEL'D BEER ");
digitalWrite(relayPin, LOW);
analogWrite(LED_B, random(10, 255));
delay(50);
analogWrite(LED_G, random(10, 255));
delay(50);
analogWrite(LED_R, random(10, 255));
delay(50);
}
// TEMP SENSOR VALUE
// read temp sensor and return temp value
int sensorPoll() {
// READ REAL TEMP
sensorCount++;
vo = analogRead(TR_PIN);
vo = vo / (1023.0 / 5.0);
// voltage divider calculation
// vo = 5 * r2 /(r1+r2)
// solve for r2
// get the exact value for voltage divider r1
r2 = ( vo * 7840) / (5.0 - vo);
//equation from data sheet
tempK = 1.0 / (a1 + (b1 * (log(r2 / 32500))) + (c1 * pow(log(r2 / 20040), 2.0)) + (d1 * pow(log(r2 / 11210), 3.0)));
tempC = (tempK - 273.15);
tempF = ((tempC * 1.8) + 32.0) * 10;
realTemp = map(tempF, 1350, 860, 350, 740);
trueTemp = realTemp / 10;
return trueTemp;
}
// SET TEMPURATURE
// read potentiometer for setting temperature
int SetTempVal() {
lcd.setCursor(0, 0);
lcd.print(" KOEL'D BEER ");
lcd.setCursor(0, 1);
lcd.print(" SET TEMP ");
setVal = analogRead(SetPin);
setTemp = map (setVal, 2.0, 880.0, 28.0, 80.0); // change 120 to 80
lcd.setCursor(14, 1);
lcd.print(setTemp);
delay(100);
State = true;
return setTemp;
}
//LED FADE
void Fade_Blue() {
for (int b = 15; b <= 255; b++) {
analogWrite(LED_B, b);
delay(5);
}
for (int b = 255; b >= 15; b--) {
analogWrite(LED_B, b);
delay(5);
}
}
void Fade_Green() {
for (int g = 15; g <= 255; g++) {
analogWrite(LED_G, g);
delay(5);
}
for (int g = 255; g >= 15; g--) {
analogWrite(LED_G, g);
delay(5);
}
}
void Fade_Red() {
for (int r = 15; r <= 255; r++) {
analogWrite(LED_R, r);
delay(5);
}
for (int r = 255; r >= 15; r--) {
analogWrite(LED_R, r);
delay(5);
}
}
// CHECK MAINS SENSOR
// check mains voltage sensor for voltage
int MainsCheck() {
if (digitalRead(relaySensor) == LOW) {
digitalWrite(relayPin, HIGH);
MainsPollVal++;
delay(20);
return MainsPollVal;
}
}
//FAULT
void Fault() {
digitalWrite(LED_B,LOW);
lcd.setCursor(0, 0);
lcd.print(" SYSTEM ");
lcd.setCursor(0, 1);
lcd.print(" FAULT! ");
digitalWrite(LED_R, HIGH);
delay(500);
digitalWrite(LED_R, LOW);
delay(500);
}
void Display() {
lcd.setCursor(0, 0);
lcd.print("SENSOR ");
lcd.setCursor(12, 0);
lcd.print(trueTemp);
lcd.setCursor(1, 1);
lcd.print(" SET ");
lcd.setCursor(14, 1);
lcd.print(setTemp);
// show state ture
if (State == true) {
lcd.setCursor(0, 1);
lcd.print("^");
}
}
