wireless monitoring system of gas detector - Faculty of Electrical ...

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33 Alpha (α) in the equation 3.3 shows the graph in Figure 3.13 is slope value. The slope value can be obtained using the equation 3.4. α α By taking the two points from the linear graph, we can calculate the slope of the LPG concentration gas which is equal to -1. Therefore, with the slope value equal to -1, equation 3.3 can be simplified into equation 3.5 by substitute the value of slope value of graph. The same methods are applied to the gas sensor MQ3 in the step 3 from the beginning to obtain and calculate the concentration of alcohol gas. The equation for alcohol gas concentration is in equation 3.6 below.
34 iv. Step 4: Since Arduino only read in the 10-bit numbering, the threshold value for alarm system to be functional as well as the project set up, concentration value need to convert into 10- bit data to programmed the Arduino programmer. The threshold values are based on the OSHA organization standard value. By using the equation 3.5 and 3.6 in step 3, value of gas concentration can be obtain. Table 3.3 below shows all the threshold value for the both gas sensor which are taken from OSHA.. The calculation for converting the value of voltage output to digital output is based on the equation 3.7 below. - Table 3.3: Threshold Value for MQ9 and MQ3 Mode Gas sensor MQ 9 MQ 3 Vo 10-bit reading Vo 10-bit reading Green < 1.67 = 2.5V Vo > = 512 Vo > = 2.5V Vo > = 512 Red > 2.5V > 512 > 2.5V > 512
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 and 48: 28 Last but not least, the output c
Page 49 and 50: 30 As mention in chapter 2, Arduino
Page 51: 32 iii. Step 3: (200, 2) (1000, 1)
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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