diff --git a/hardware/src/MQ7.cpp b/hardware/src/MQ7.cpp
new file mode 100644
index 0000000..2041d3d
--- /dev/null
+++ b/hardware/src/MQ7.cpp
@@ -0,0 +1,26 @@
+#include "MQ7.hpp"
+
+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