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The KY033 KY 033 KY-033 Tracking sensor TCRT5000 infrared sensor continuously emits an infrared emitting diode when there is no reflected or TCRT 5000 reflected infrared light, but the intensity is not large enough, the phototransistor is already in the off state, the output end of the module is high, indicating that the diode is always off; in the detection range to be detected In the object, the intensity of the TCRT-5000 reflected infrared ray is large enough, the phototransistor is saturated, the output of the module is low, and the indicator light is illuminated.

This is a touch sensor to detect contact with charged bodies like human fingers and so on. These sensors are used in touch screens, you can use them to implement your own touch screen and your security system. Another application is to create an electrical safety switch, that prevents people from electrification, so whenever an electric conductor is touched by a charged object (human), the electricity will go OFF.

KY-038 LM393 Sound Detection Sensor Module for Arduino detects whether the sound has exceeded a threshold value. The sound is detected via a microphone and fed into an LM393 op-amp. The sound level setpoint is adjusted via an onboard potentiometer. When the sound level exceeds the setpoint, an LED on the module is illuminated and the output is sent low.

KY040 KY-040 Rotary Encoder Sensor Module Brick Sensor is a rotary input device (as in knob) that provides an indication of how much the knob has been rotated AND what direction it is rotating in. It’s a great device for stepper and servo motor control. You could also use it to control devices like digital potentiometers.KY040 M274 360 rotary Degree encoder, is an incremental electro-mechanical device that converts the angular position or motion of a shaft or axle to digital code. The output of incremental encoders provides information about the motion of the shaft, which is typically further processed in processor/controllers into information such as speed, distance, and position.

This LM393 Photosensitive Light-Dependent Control Sensor Module has high quality using a voltage LM393 comparator with a mounting screw hole. Easy to install using the sensitive type photosensitive resistance sensor the comparator output signal clean waveform is good.