Update README.md

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Miguel Angel Califa Urquiza 2020-04-02 09:56:03 -05:00 committed by GitHub
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@ -43,7 +43,7 @@ float ppmCH4 = MQ4.readSensor();
##### Graph
![Wiring_MQSensor](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/Points_explanation.jpeg)
#### RS/R0 value (From datasheet of your sensor)
* RS (Clean air - English) -> (Aire puro - Spanish)
* RS/R0 (Clean air - English) -> (Aire puro - Spanish)
* **Note**: RS/R0 is equal to Ratio variable on the program
![Graph from datasheet](https://raw.githubusercontent.com/miguel5612/MQSensorsLib_Docs/master/static/img/Graph_Explanation.jpeg)
### Arduino