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 Arduino Library for MQ135 Sensor
 
 ## Learn more
-* [https://jayconsystems.com/blog/understanding-a-gas-sensor]()
+* [https://jayconsystems.com/blog/understanding-a-gas-sensor](https://jayconsystems.com/blog/understanding-a-gas-sensor)
 
     Basic understanding of an Air-Quality Sensor
-* [https://github.com/miguel5612/MQSensorsLib]()
+* [https://github.com/miguel5612/MQSensorsLib](https://github.com/miguel5612/MQSensorsLib)
 
     Another MQ135 Library
-* [https://github.com/GeorgK/MQ135]()
+* [https://github.com/GeorgK/MQ135](https://github.com/GeorgK/MQ135)
   
     Another MQ135 Library
+
+## How does this work?
+First we need to calculate the actual voltage from our sensor. The value we read by ``analogRead`` is just a value mapped to 2^10 bits.
+
+Since we are running our sensor at 5V, a measured value of 1023 equals 5V and the measured value 0 equals 0V. We convert this with the following formula:
+
+```
+// x is our measured value
+voltage = x * 5 / 1023
+// or
+voltage = 5x / 1023
+```
+
+Next we can calculate the resistance of the sensor.
+For more details should be looked up in this article: [https://jayconsystems.com/blog/understanding-a-gas-sensor]()
+
+```
+V = I x R 
+VRL = [VC / (RS + RL)] x RL 
+VRL = (VC x RL) / (RS + RL) 
+
+So now we solve for RS: 
+
+VRL x (RS + RL) = VC x RL
+(VRL x RS) + (VRL x RL) = VC x RL 
+(VRL x RS) = (VC x RL) - (VRL x RL)
+RS = [(VC x RL) - (VRL x RL)] / VRL
+RS = [(VC x RL) / VRL] - RL
+```
+
+To calculate the gas content in the air from the resistance we use the values from [https://github.com/miguel5612/MQSensorsLib](https://github.com/miguel5612/MQSensorsLib)