diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..bfcd315
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,58 @@
+#include <Wire.h>
+#include "SparkFun_SCD30_Arduino_Library.h"
+#include "LiquidCrystal_I2C.h"
+#define LED_PIN3
+/*int ledR =2;
+int ledO =4;
+int ledV =5;*/
+int ledR =5; 
+int ledO =18;
+int ledV =19;
+SCD30 airSensor;
+
+void setup()
+{
+Serial.begin(9600);
+Serial.println("SCD30 Example");
+Wire.begin();
+if (airSensor.begin() == false)
+{
+Serial.println("Air sensor not detected. Please check wiring. Freezing...");
+while (1)
+;
+}
+pinMode(ledR, OUTPUT);
+pinMode(ledO, OUTPUT);
+pinMode(ledV, OUTPUT);
+}
+void loop()
+{
+int taux_co2;
+if (airSensor.dataAvailable())
+{
+taux_co2 = (int)airSensor.getCO2();
+Serial.print("co2(ppm):");
+Serial.print(taux_co2);
+Serial.print(" temp(C):");
+Serial.print(airSensor.getTemperature(), 1);
+Serial.print(" humidity(%):");
+Serial.print(airSensor.getHumidity(), 1);
+Serial.println();
+if (taux_co2 < 800){
+digitalWrite(ledV,HIGH);
+digitalWrite(ledO,LOW);
+digitalWrite(ledR,LOW);
+}
+else if (taux_co2 >= 800 && taux_co2 < 1000){
+digitalWrite(ledO,HIGH);
+digitalWrite(ledV,LOW);
+digitalWrite(ledR,LOW);
+}
+else if (taux_co2 >= 1000){
+digitalWrite(ledR,HIGH);
+digitalWrite(ledO,LOW);
+digitalWrite(ledV,LOW);
+}
+}
+delay(500);
+}
\ No newline at end of file