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

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25 Figure 3.7 above shown gas sensor connection to the Arduino pins. The A0 pin connected at the Arduino will read the output voltage from the sensor. 3.2.2 Output circuit The output circuit consists of four type components: i. Light-Emitting Diode (LED) ii. Buzzer iii. Exhaust Fan iv. Zigbee All of four components have their own purpose for the project in order to inform the users that the level of dangerous gas in the surrounding areas continuously. There are three LEDs used namely as red LED, yellow LED and green LED. All of these LED indicate three different level of gas concentration in the atmosphere as listed in Table 3.1.
26 Table 3.1: Threshold Value for Gas Concentration MQ3 and MQ9 LED Gas concentration value (ppm) LPG (MQ6) Alcohol (MQ3) Green < 500 < 0.4 Yellow 500 > = x = > 1000 0.4 > = x = > 1 Red > 1000 > 1 When the red LED is light up, buzzer will also be trigged to inform user that the surrounding areas have reached a dangerous level and emergency evacuation is needed. Meanwhile, exhaust fan will turn on along with the yellow LED to show the level concentration in the warning stage and exhaust fan is used to suck out the dangerous gas as the precaution before entering the dangerous level. BUZZER RED LED 13 12 11 330k ohm 330k ohm 330k ohm GREEN LED 5V relay 5V exhaust fan YELLOW LED 2N22 Figure 3.8: Output Circuit Diagram
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: 24 Figure 3.6: Gas Sensor Circuit D
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 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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