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--- amc2021:groupl:extras:mq-135:start [2021/09/05 04:46] – kshama001
+++ amc2021:groupl:extras:mq-135:start [2023/01/05 14:38] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== M_Q135.h ======
- *Rzero is the value of the resistor in the MQ-135 sensor in the presence of clean air. Where the CO <sub>2</sub> value is around 397.13 ppm as given below. The Rzero value varies for each individual sensor and can be found using another Arduino [[amc2021:groupl:extras:r0:start|code]]
+ Rzero is the value of the resistor in the MQ-135 sensor in the presence of clean air. Where the CO <sub>2</sub> value is around 400 ppm as given below. The Rzero value varies for each individual sensor and can be found using another Arduino [[amc2021:groupl:extras:r0:start|code]]
   *RLOAD meanwhile is the external resistor value that is connected to the MQ-135 sensor, which in this case is 10kΩ.
   *Important parameters are for calculating CO<sub>2</sub> of 116.6 and 2.79 are taken from a calibration graph as seen from the [[https://www.electronicoscaldas.com/datasheet/MQ-135_Hanwei.pdf|datasheet]]. This shows the sensitivity of the sensor varies for each gas.
 {{ :amc2021:groupL:extras:mq-135:screenshot_2021-09-03_at_01.11.54.png |here}}
+From the below code, we replace the Rzero value(which we get with the function getRzero()) and use the float getPPM() to get the level of CO<sub>2</sub>
 <file - M_Q135.h>