wireless monitoring system of gas detector - Faculty of Electrical ...
wireless monitoring system of gas detector - Faculty of Electrical ...
wireless monitoring system of gas detector - Faculty of Electrical ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
29<br />
3.3 S<strong>of</strong>tware Implementation<br />
This section will specifically discuss the methodology to interface the sensor and<br />
hardware module. The most important part is to enable the analog sensor to send analog<br />
data to Arduino then transfer to the LABVIEW. The first technique to interface the<br />
analog output to Arduino is to produce the relation between the sensor analog range and<br />
Arduino analog to digital converter (ADC) specification. This relation is based on <strong>gas</strong><br />
concentration calculation and will be explained in details the following section.<br />
3.3.1 Gas Concentration Calculation Process<br />
The following calculation will be clarified in numbering step to construct an<br />
equation for this sensor. Based on the datasheet <strong>of</strong> MQ3 and MQ9 the input and output<br />
voltage range shown in Table 3.2.<br />
Table 3.2: Gas Sensor input and output voltage range<br />
Specification<br />
Gas sensor<br />
MQ 9 MQ 3<br />
Input voltage range DC 5.0 ± 0.2 V DC 5.0 ± 0.2 V<br />
Output voltage range DC 0 – 5.0 V DC 0 – 5.0 V