This relay module is 5V active low. It is a single channel relay interface board, which can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, PLC, etc.
The HW-040 Rotary Encoder Module is a device that generates an electrical signal based on how much the rotary input device (knob) is rotated and the direction it is rotating
The HW-483 is DC5V 6mm 650nm Red Color Laser Diode Module For Arduino Very Easy To Use, Do controllable laser pointer, theft detection, etc. interesting application devices.
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