Hello all, I have been working on a project for a while, and figured it was far enough along to be added to the gallery. I finished the final revision of the code for version 1.02 of SimpleStat, the thermostat setup meant for an Arduino, for this I used a Mega 2560. All the parts are very common with the exception of a digital temperature module, a DS18B20 (Datasheet). I got this sensor module from a 37 Sensor Kit from Amazon for about $25. Anyway, this is a project I made simply out of boredom with no real purpose to me. Below is the code and attached is the parts list, and a Fritzing breadboard layout. Becuase I've heard a lot about preferring schematics over layouts I also took the time to put together a schematic and put that below as well. For this project, I also used a different IDE, PROGRAMINO, which is a paid IDE for Arduino. I am currently on the trial but I plan to buy and I recommend it for any partially advanced users, I do not recommend it for beginners though as it is quite a bit more complicated.
The Code:
/******************************************************************
Created on 10.07.2016 at 15:30:45
Project : Arduino SimpleStat v1.02
Libraries : LiquidCrystal, DallasTemperature, OneWire
Author : Michael P. (Mike4449)
Description : Simple thermostat for various applications, measured in Celsius
License : Creative Commons Attribution 2.0 Generic (CC BY 2.0)
Part List : See parts.txt
******************************************************************/
#include <LiquidCrystal.h>
#include <DallasTemperature.h>
#include <OneWire.h>
//Custom characters for the LCD
byte sys_COOL[8] = {
0b00000,
0b01110,
0b01000,
0b01000,
0b01000,
0b01110,
0b00000,
0b00000
};
byte sys_HEAT[8] = {
0b00000,
0b01010,
0b01010,
0b01110,
0b01010,
0b01010,
0b00000,
0b00000
};
byte sys_IDLE[8] = {
0b00000,
0b01110,
0b01010,
0b01010,
0b01010,
0b01110,
0b00000,
0b00000
};
byte sys_SYMBOL[8] = {
0b11100,
0b10100,
0b11100,
0b00000,
0b00000,
0b00000,
0b00000,
0b00000
};
byte fan_OFF[8] = {
0b00000,
0b00100,
0b00100,
0b11111,
0b00100,
0b00100,
0b00000,
0b00000
};
byte fan_ON[8] = {
0b00000,
0b00010,
0b10100,
0b01110,
0b00101,
0b01000,
0b00000,
0b00000
};
//Variables to increase readability later on
const uint8_t COOL = 0;
const uint8_t HEAT = 1;
const uint8_t OFF = 2;
const uint8_t SYMBOL = 3;
const uint8_t fanOFF = 4;
const uint8_t fanON = 5;
//Setup the LCD and the sensors
OneWire oneWire(22); // The temperature sensor is on pin 22
DallasTemperature tempSensor(&oneWire);
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
//The circuit components
const uint8_t GRN_LED = 51;
const uint8_t TEMP_SET = A14;
const uint8_t HEAT_PIN = 23;
const uint8_t COOL_PIN = 24;
//Control the min/max temperature settings in Celsius
const uint8_t MIN = 7;
const uint8_t MAX = 33;
void setup() {
lcd.begin(16, 2);
tempSensor.begin();
lcd.createChar(COOL, sys_COOL);
lcd.createChar(HEAT, sys_HEAT);
lcd.createChar(OFF, sys_IDLE);
lcd.createChar(SYMBOL, sys_SYMBOL);
lcd.createChar(fanOFF, fan_OFF);
lcd.createChar(fanON, fan_ON);
pinMode(GRN_LED, OUTPUT);
pinMode(TEMP_SET, INPUT);
pinMode(HEAT_PIN, OUTPUT);
pinMode(COOL_PIN, OUTPUT);
lcd.print("Starting");
}
void loop() {
static uint8_t setTemp;
static uint8_t curTemp;
static boolean COOLING = false;
static boolean HEATING = false;
static boolean OFF = false;
static boolean counter = 0; // so the mode does not switch all the time
setTemp = getSet();
curTemp = getCur();
//Run the two values through an 'if-statement filter' to decide what to do
if (curTemp < setTemp) {
HEATING = true;
COOLING = false;
OFF = false;
}
else if (curTemp > setTemp) {
HEATING = false;
COOLING = true;
OFF = false;
}
else if (curTemp == setTemp) {
HEATING = false;
COOLING = false;
OFF = true;
}
else {
HEATING = false;
COOLING = false;
OFF = true;
}
updateLCD(HEATING, COOLING, OFF, curTemp, setTemp); // show data on the LCD
delay(1000);
counter++;
if (counter == 300) { // will happen every 5 min or so, stops the stat from bouncing between modes while allowing the LCd to update
updateStat(HEATING, COOLING, OFF);
}
}
uint8_t getSet() {
uint16_t rawRead = analogRead(TEMP_SET);
uint8_t newRead;
newRead = map(rawRead, 0, 1023, MIN, MAX);
return newRead;
}
uint8_t getCur() {
tempSensor.requestTemperatures();
uint8_t tempNow = tempSensor.getTempCByIndex(0);
return tempNow;
}
void updateStat(boolean heat, boolean cool, boolean off) {
if (heat) {
digitalWrite(HEAT_PIN, HIGH);
digitalWrite(COOL_PIN, LOW);
digitalWrite(GRN_LED, HIGH);
}
else if (cool) {
digitalWrite(HEAT_PIN, LOW);
digitalWrite(COOL_PIN, HIGH);
digitalWrite(GRN_LED, HIGH);
}
else if (off) {
digitalWrite(HEAT_PIN, LOW);
digitalWrite(COOL_PIN, LOW);
digitalWrite(GRN_LED, LOW);
}
}
void updateLCD(boolean heat, boolean cool, boolean off, uint8_t temp, uint8_t set) {
lcd.clear();
lcd.print("SET: ");
lcd.print(set);
lcd.write((byte)SYMBOL);
lcd.print("C");
lcd.setCursor(0, 1);
lcd.print("CUR: ");
lcd.print(temp);
lcd.write((byte)SYMBOL);
lcd.print("C");
// update the fan symbol, is it on or off?
lcd.setCursor(14 ,0);
if (off == false) {
lcd.write((byte)fanON);
}
else {
lcd.write((byte)fanOFF);
}
// update the mode symbol, what mode is it in?
lcd.setCursor(15, 0);
if (heat) {
lcd.write((byte)HEAT);
}
else if (cool) {
lcd.write((byte)COOL);
}
else if (off) {
lcd.write((byte)OFF);
}
// update the mode text, what is the mode?
if (heat) {
lcd.setCursor(12, 1);
lcd.print("HEAT");
}
else if (cool) {
lcd.setCursor(12, 1);
lcd.print("COOL");
}
else if (off) {
lcd.setCursor(13, 1);
lcd.print("OFF");
}
}
SimpleStat_v1-02.ino (5.07 KB)
parts.txt (200 Bytes)
