The 37-in-1 sensors set for the Arduino system consists of 37 individual modules which can be used to carry out many interesting experiments using the Arduino Uno system. A short description of each module is given below. 1 x Small passive buzzer module KY-006- 1 x 2-color LED module KY-011- 1 x Hit sensor module KY-031- 1 x Vibration switch module KY-002- 1 x Photo resistor module KY-018- 1 x Key switch module KY-004- 1 x Tilt switch module KY-020- 1 x 3-color full-color LED SMD modules KY-009- 1 x Infrared emission sensor module KY-005- 1 x 3-color LED module KY-016- 1 x Mercury open optical module KY-017- 1 x Yin Yi 2-color LED module 3MM KY-029- 1 x Active buzzer module KY-012- 1 x Temperature sensor module KY-013- 1 x Automatic flashing colorful LED module KY-034- 1 x Mini magnetic reed modules KY-021- 1 x Hall magnetic sensor module KY-003- 1 x Infrared sensor receiver module KY-022- 1 x Class Bihor magnetic sensor KY-035- 1 x Magic light cup module KY-027- 1 x Rotary encoder module KY-040- 1 x Optical broken module KY-010- 1 x Detect the heartbeat module KY-039- 1 x Reed module KY-025- 1 x Obstacle avoidance sensor module KY-032- 1 x Hunt sensor module KY-033- 1 x Microphone sound sensor module KY-038- 1 x Laser sensor module KY-008- 1 x 5V relay module KY-019- 1 x Temperature sensor module KY-001- 1 x Temperature sensor module KY-028- 1 x Linear magnetic Hall sensors KY-024- 1 x Flame sensor module KY-026- 1 x Sensitive microphone sensor module KY-037- 1 x Temperature and humidity sensor module KY-015- 1 x XY-axis joystick module KY-023- 1 x Metal touch sensor module KY-036.