int sensorIn = A4;
#include
#include
#include
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_MOSI 9
#define OLED_CLK 10
#define OLED_DC 11
#define OLED_CS 12
#define OLED_RESET 13
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
void setup(){
Serial.begin(9600);
// Set the default voltage of the reference voltage
analogReference(DEFAULT);
display.begin(SSD1306_SWITCHCAPVCC);
display.clearDisplay();
display.display();
}
void loop(){
//Read voltage
int sensorValue = analogRead(sensorIn);
// The analog signal is converted to a voltage
float voltage = sensorValue*(5000/1024.0);
if(voltage == 0)
{
Serial.println("Fault");
}
else if(voltage < 400)
{
Serial.println("preheating");
}
else
{
int voltage_diference=voltage-400;
float concentration=voltage_diference*50.0/16.0;
// Print Voltage
Serial.print("voltage: ");
Serial.print(voltage);
Serial.println("mv");
//Print CO2 concentration
Serial.print("CO2 Concentration: ");
Serial.print(concentration);
Serial.println("ppm");
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(18,43);
display.println("CO2");
display.setCursor(63,43);
display.println("(PPM)");
display.setTextSize(2);
display.setCursor(28,5);
display.println(concentration);
display.display();
display.clearDisplay();
}
delay(2000);
}