Lesson 31 Soil Moisture Detection ........................................................................... 118
Lesson 32 MQ-2 Gas Sensor .................................................................................... 121
Lesson 33 Sound Sensor ........................................................................................ 125
Lesson 34 PS2 Joystick .......................................................................................... 128
Lesson 35 LCD1602 Display ................................................................................... 131
Lesson 36 How to Make a Simple Thermometer(1) .................................................... 137
Lesson 37 How to Make a Simple Thermometer(2) .................................................... 139
Lesson 38 Make a Distance Measuring Device ........................................................... 142
Lesson 39 How to Make a Simple Voltmeter(1).......................................................... 145
Lesson 40 How to Make a Simple Voltmeter(2).......................................................... 148
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