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29 3.3 Software Implementation This section will specifically discuss the methodology to interface the sensor and hardware module. The most important part is to enable the analog sensor to send analog data to Arduino then transfer to the LABVIEW. The first technique to interface the analog output to Arduino is to produce the relation between the sensor analog range and Arduino analog to digital converter (ADC) specification. This relation is based on gas concentration calculation and will be explained in details the following section. 3.3.1 Gas Concentration Calculation Process The following calculation will be clarified in numbering step to construct an equation for this sensor. Based on the datasheet of MQ3 and MQ9 the input and output voltage range shown in Table 3.2. Table 3.2: Gas Sensor input and output voltage range Specification Gas sensor MQ 9 MQ 3 Input voltage range DC 5.0 ± 0.2 V DC 5.0 ± 0.2 V Output voltage range DC 0 – 5.0 V DC 0 – 5.0 V
30 As mention in chapter 2, Arduino is 10 bit analog to digital converter microcontroller. Therefore, based on the hardware, the real input voltage of gas sensor is 5V. i. Step 1: Since the binary for Arduino is 10-bit, it is equal to 2^10= 1024 steps or levels of the resolution. The maximum output from the gas sensor, 5V is then divided into 1024. From the calculation above, 1-bip output is equal to 4.88mV in the real voltage output. Figure 3.12 below shows the relation between voltage output from gas sensor and Arduino reading more clearly. voltage output (V) 5 4 3 2 1 204.8 409.6 614.4 819.2 1024 digital ouput (bit) Figure 3.11: Voltage Output of Gas Sensor Versus digital output in Arduino.
Page 1 and 2: WIRELESS GAS MONITORING SYSTEM OF G
Page 3 and 4: “I hereby declare that I have rea
Page 5 and 6: ii I declare that this thesis entit
Page 7 and 8: iv ACKNOWLEDGEMENT In preparing thi
Page 9 and 10: vi ABSTRAK Tujuan projek ini adalah
Page 11 and 12: viii 2.1 Introduction 6 2.2 The Haz
Page 13 and 14: x LIST OF TABLES TABLE NO. TITLE PA
Page 15 and 16: xii 3.1 Methodology of the Project
Page 17 and 18: xiv LIST OF SYMBOLS CO - Carbon Mon
Page 19 and 20: xvi LIST OF APPENDICES APPENDIX TIT
Page 21 and 22: 2 min, and death within 30 min. Ver
Page 23 and 24: 4 iv. Zigbee Arduino Uno is a devic
Page 25 and 26: 6 CHAPTER 2 LITERATURE REVIEW 2.1 I
Page 27 and 28: 8 (which is 300ppm), the actuator c
Page 29 and 30: 10 2.2 The hazardous gases Based on
Page 31 and 32: 12 From Ohms Law in equation 2.1, v
Page 33 and 34: 14 advanced analysis and data visua
Page 35 and 36: 16 2.5.1 Buzzer Figure 2.10: Buzzer
Page 37 and 38: 18 2.5.3 Exhaust Fan Exhaust fan as
Page 39 and 40: 20 Start Writing programming and co
Page 41 and 42: 22 Figure 3.3: Experiment Diagram o
Page 43 and 44: 24 Figure 3.6: Gas Sensor Circuit D
Page 45 and 46: 26 Table 3.1: Threshold Value for G
Page 47: 28 Last but not least, the output c
Page 51 and 52: 32 iii. Step 3: (200, 2) (1000, 1)
Page 53 and 54: 34 iv. Step 4: Since Arduino only r
Page 55 and 56: 36 start read the output voltage by
Page 57 and 58: 38 void setup() { Serial.begin(9600
Page 59 and 60: 3.3V RX TX 5V GND 40 digitalWrite(l
Page 61 and 62: 42 The set up for the Zigbe data tr
Page 63 and 64: 44 Figure 3.23: VISA Interfacing Bl
Page 65 and 66: 46 The last stage in the data monit
Page 67 and 68: 48 Figure 3.28: Step 2 Then, the fi
Page 69 and 70: 50 CHAPTER 4 RESULT AND DISCUSSION
Page 71 and 72: 52 The overall project set up shown
Page 73 and 74: 54 After that, the system of gas mo
Page 75 and 76: 56 CHAPTER 5 CONCLUSION AND RECOMME
Page 77 and 78: 58 REFERENCES [1] Incorporated, C.
Page 79 and 80: 60 APPENDIX 1. Block diagram for MQ
Page 81 and 82: 3. Arduino programming for MQ3 62

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