diff --git a/hardware/include/MQ7.hpp b/hardware/include/MQ7.hpp
new file mode 100644
index 0000000..c184b79
--- /dev/null
+++ b/hardware/include/MQ7.hpp
@@ -0,0 +1,6 @@
+#include <Arduino.h>
+#define analogMQ7 33
+#define digitalMQ7 32
+
+void MQ7_init();
+void MQ7_read();
\ No newline at end of file
diff --git a/hardware/include/main.hpp b/hardware/include/main.hpp
index f556608..18d4a23 100644
--- a/hardware/include/main.hpp
+++ b/hardware/include/main.hpp
@@ -18,6 +18,7 @@
 #include "RestClient.hpp"
 #include "WifiConnection.hpp"
 #include "MqttClient.hpp"
+#include "MQ7.hpp"
 
 uint32_t getChipID();
 >>>>>>> main
diff --git a/hardware/src/MQ7.cpp b/hardware/src/MQ7.cpp
new file mode 100644
index 0000000..954b2cb
--- /dev/null
+++ b/hardware/src/MQ7.cpp
@@ -0,0 +1,31 @@
+#include "MQ7.hpp"
+
+float sensor_volt;
+float RS_air; 
+float R0;  
+float sensorValue;
+
+void MQ7_init() {
+    pinMode(digitalMQ7, INPUT);
+    pinMode(analogMQ7, INPUT);
+}
+
+void MQ7_read() {
+    analogWrite(analogMQ7, 1023);
+    delay(60000);
+    analogWrite(analogMQ7, (1023/5)*1.4 );
+
+    for(int i = 0; i<100; i++){
+        sensorValue = sensorValue + analogRead(analogMQ7);
+        delay(90000);
+    }
+
+    sensorValue = sensorValue/100.0;
+    sensor_volt = sensorValue/1024*5.0;
+    RS_air = (5.0-sensor_volt)/sensor_volt;
+    R0 = RS_air/(26+(1/3));
+
+    Serial.print("R0 = ");
+    Serial.println(R0);
+    delay(1000);
+}
\ No newline at end of file
diff --git a/hardware/src/main.cpp b/hardware/src/main.cpp
index fb27a34..cb6848c 100644
--- a/hardware/src/main.cpp
+++ b/hardware/src/main.cpp
@@ -22,11 +22,13 @@ void setup() {
         Serial.print("Error connecting to WiFi");
     }
 
+    MQ7_init();
+
     // test get
     getRequest(httpClient, "http://172.20.10.7:8082/api/v1/sensors/1/values", response);
     deserializeSensorValue(httpClient, httpClient.GET());
 }
  
 void loop() {
-    
+    MQ7_read();
 }
\ No newline at end of file