JSN-SR0T4 is a waterproof ultrasonic distance measurement sensor module with a range of 25cm-450cm non-contact distance measurement. It is very similar to the ultrasonic sensors which are found in car bumpers.
Description of KY-040 Rotary Encoder
KY-040 rotary encoder is a device that generates an electrical signal based upon how much the
rotary input device (knob) is rotated and the direction it is rotating in.
Description of MC-38
The MC-38 magnetic switch sensor comes in a pair consisting of a Reed Switch and a magnet. The wired part of the module is the reed switch, whereas the other part is the magnet. It is commonly used as a home security alarm system.
Description of ZMCT103C Current Sensor Module
The microcurrent precision current sensor is a module capable to measure a current level up to 5A. This current sensor module is based upon the ZMCT103C IC.