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sketch.ino
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sketch.ino
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bool debug_mode = true;
String software_version = "1.4";
#include <OLEDDisplay.h>
#include <OLEDDisplayFonts.h>
#include <OLEDDisplayUi.h>
#include <SSD1306.h>
#include <SSD1306Brzo.h>
#include <SSD1306Wire.h>
#include <brzo_i2c.h>
#include <MHZ.h>
#include <SoftwareSerial.h>
#define scl D1
#define sda D2
#define led_red D3
#define led_yellow D6
#define led_green D5
#define sound D0
#define MH_Z19_RX D9
#define MH_Z19_TX D10
#define CO2_IN D7
MHZ co2(MH_Z19_RX, MH_Z19_TX, CO2_IN, MHZ19B);
SSD1306Brzo display(0x3c, sda, scl);
int green = 600;
int red = 1000;
int _co2;
bool wasSoundPlayed = false;
//#########################################################################################################################################
void drawToDisplay() {
display.drawString(0, 26, "Preheating.." + String(180 - millis() / 1000));
}
void manageDisplay() {
display.clear();
display.display();
drawToDisplay();
display.display();
display.clear();
}
int checkCO2(int current_co2) {
if (current_co2 <= green) {
return 3;
} else if (current_co2 > green && current_co2 < red) {
return 2;
} else if (current_co2 >= red) {
return 1;
} else {
if (debug_mode == true) Serial.print("\nInvalid CO2 value in the checkCO2() function");
return 0;
}
}
//#########################################################################################################################################
void greenLED() {
if (debug_mode == true) Serial.println("Green");
digitalWrite(led_red, LOW);
digitalWrite(led_yellow, LOW);
digitalWrite(led_green, HIGH);
display.clear();
display.display();
display.drawString(64, 22, " Good. " );
display.display();
delay(1000);
}
void yellowLED() {
if (debug_mode == true) Serial.println("Yellow");
digitalWrite(led_red, LOW);
digitalWrite(led_yellow, HIGH);
digitalWrite(led_green, LOW);
display.clear();
display.display();
display.drawString(64, 22, " Caution! ");
display.display();
wasSoundPlayed = false;
delay(1000);
}
void redLED() {
if (debug_mode == true) Serial.println("Red");
digitalWrite(led_red, HIGH);
digitalWrite(led_yellow, LOW);
digitalWrite(led_green, LOW);
display.clear();
display.display();
display.drawString(64, 22, " Ventilate! " );
display.display();
delay(1000);
}
void yellowBlinkLED() {
digitalWrite(led_red, LOW);
digitalWrite(led_green, LOW);
digitalWrite(led_yellow, HIGH);
delay(500);
digitalWrite(led_yellow, LOW);
delay(500);
}
void playSound() {
digitalWrite(sound, HIGH);
delay(250);
digitalWrite(sound, LOW);
delay(250);
}
//#########################################################################################################################################
void setup() {
pinMode(led_red, OUTPUT);
pinMode(led_yellow, OUTPUT);
pinMode(led_green, OUTPUT);
pinMode(CO2_IN, INPUT);
pinMode(sound, OUTPUT);
display.init();
display.flipScreenVertically();
display.setFont(ArialMT_Plain_16);
if (debug_mode == true) {
Serial.begin(9600);
delay(100);
Serial.print("Starting the program with software version " + String(software_version));
}
if (co2.isPreHeating()) {
if (debug_mode == true) Serial.println("\nPreheating..");
while (co2.isPreHeating()) {
manageDisplay();
yellowBlinkLED();
}
}
}
//#########################################################################################################################################
void loop() {
_co2 = co2.readCO2PWM();
if (!co2.isPreHeating()) {
if (debug_mode == true) {
Serial.print("CO2: ");
if (_co2 > 0) {
Serial.print(_co2);
Serial.println("ppm");
} else {
Serial.print("CO2 value not availble");
}
};
switch (checkCO2(_co2)) {
case 0:
if (debug_mode == true) Serial.println("\nInvalid CO2 value in the switch statement, case 0");
break;
case 1:
redLED();
if (wasSoundPlayed == false) {
for (int i = 0; i < 3; i++) {
playSound();
}
wasSoundPlayed = true;
}
break;
case 2:
yellowLED();
break;
case 3:
greenLED();
break;
default:
if (debug_mode == true) Serial.println("\nInvalid CO2 value in the switch statement, case default");
break;
}
}
}