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just by joining the positive and negative terminal to power supply and LED+
The TF Card U Disk MP3 Format Decoder Board Module Audio Player is used to play MP3 music stored on a micro SD card or USB memory
The module is suitable to control small robot cars
GND for ground
Overload and Over-voltage
EM-18 RFID Reader Module Variabale Resistor just by joining the positiveRadio frequency identification (RFID) technology whereby digital data encoded in RFID tags is captured or identified by a reader via radio waves. EM 18 RFID Reader Module utilizes radio frequency electromagnetic fields to transfer data, For the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information. This EM 18 RFID Reader is a Tiny, simple to use RFID reader module. Pinout Pin