Lesson 27 Flame Sensor ..................................................................................................................... 69
Lesson 28 Relay Module ................................................................................................................... 71
Lesson 29 Joystick PS2 ....................................................................................................................... 73
Lesson 30 MQ-2 Gas Sensor.............................................................................................................. 75
Lesson 31 Password Lock .................................................................................................................. 77
Lesson 32 Lie Detector ...................................................................................................................... 79
Lesson 33 Fire Alarm .......................................................................................................................... 81
Lesson 34 Thermostatic Water Tank System ................................................................................... 83
Lesson 35 Intelligent Environment Monitoring ................................................................................ 85
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