diff --git a/.gitignore b/.gitignore
index 8126b3a..8f64da7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.DS_Store
 .pio
 .idea
 .vscode
diff --git a/src/main.cpp b/src/main.cpp
index 9dcc8b6..e699b84 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,11 +3,7 @@
 #include "Adafruit_AHTX0.h"
 #include "LiquidCrystal_I2C.h"
 
-#define RX_PIN 16                                          // Rx pin which the MHZ19 Tx pin is attached to
-#define TX_PIN 17                                          // Tx pin which the MHZ19 Rx pin is attached to
-#define BAUDRATE 9600                                      // Device to MH-Z19 Serial baudrate (should not be changed)
-
-MHZ19 myMHZ19;                                             // Constructor for library
+MHZ19 myMHZ19;
 Adafruit_AHTX0 aht;
 LiquidCrystal_I2C LCD(0x27,2,1,0,4,5,6,7,3,POSITIVE);
 
@@ -36,12 +32,11 @@ void IRAM_ATTR BacklightToggle() {
 
 void setup()
 {
-    Serial.begin(9600);                                     // Device to serial monitor feedback
+    Serial.begin(9600);
+    Serial2.begin(9600, SERIAL_8N1, 16, 17);
 
-    Serial2.begin(BAUDRATE, SERIAL_8N1, RX_PIN, TX_PIN);                               // (Uno example) device to MH-Z19 serial start
-    myMHZ19.begin(Serial2);                                // *Serial(Stream) refence must be passed to library begin().
-
-    myMHZ19.autoCalibration();                              // Turn auto calibration ON (OFF autoCalibration(false))
+    myMHZ19.begin(Serial2);
+    myMHZ19.autoCalibration();
     myMHZ19.setRange(2000);
 
     Serial.println("MHZ19 init:");
@@ -109,7 +104,7 @@ void loop() {
     int co2 = myMHZ19.getCO2(false);
     if (myMHZ19.errorCode != RESULT_OK) {
         Serial.print("Error. Response Code: ");
-        Serial.println(myMHZ19.errorCode);          // Get the Error Code value
+        Serial.println(myMHZ19.errorCode);
         return;
     }
     LCD.setCursor(0, 1);