In this book Cover all 40 Arduino Sensors details, Applications, Example Codes, Specifications and Ex. KY-001 Temperature sensor module, KY-002 Vibration switch module, KY-003 Hall magnetic sensor module, KY-004 Key switch module, KY-005 Infrared emission sensor module, KY-006 Small passive buzzer, KY-008 Laser sensor module, KY-009 3-color full-color LED SMD module, KY-010 Optical broken module, KY-011 2-color LED module, KY-012 Active buzzer module, KY-013 Temperature sensor module (have not been able to use this on the NodeMCU yet), KY-015 Temperature and humidity sensor module, KY-016 3-color LED module, KY-017 Mercury open optical module, KY-018 Photo resistor module KY-019 5v relay module, KY-020 Tilt switch module, KY-021 Mini magnetic reed module, KY-022 Infrared sensor receiver module, KY-023 XY-axis joystick module, KY-024 Linear magnetic hall sensor, KY-025 Reed module, KY-026 Flame sensor module, KY-027 Magic light cup module, KY-028 Temperature sensor module, (have not been able to use this on the NodeMCU yet), KY-029 Yin Yi 2-color LED module 3MM, KY-031 Hit sensor module, KY-032 Obstacle avoidance sensor module, KY-033 Hunt sensor module, KY-034 Automatic flashing colorful LED module, KY-035 Class Bihor magnetic sensor, KY-036 Metal touch sensor module, KY-037 Sensitive microphone sensor module, KY-038 Microphone sound senor module, KY-039 Heartbeat detector module, KY-040 Rotary encoder module. A sensor is a guy who provides data to the system via its input. Say you set your air conditioning system to bring the room temperature to 15 degrees, considering it was previously off (and the current temperature of the room is different than 15 degrees), now the system starts pumping air to bring the room to the desired temperature, how does it know when the room temperature has been reached? Here is where the sensor comes into play: there must be a sensor in the room to tell the air-conditioning system to stop pumping when the wanted temperature is attained. That is roughly it.
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LEARN ARDUINO SENSORS QUICK GUIDE: 40 Sensors details, Applications, Example Codes, Specifications 
