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It is LM2596S DC-DC Power Supply Step Down Module with Input Voltage Range is DC 3
This can usually be implemented by enabling an internal pull-up on the uC data pin
D5: Digital output
Module Power : 5 V
RFID Card 125khz 9V Battery It is LM2596S DC-DC PowerIntroduction : RFID Card 125khz which is widely used for RFID radio frequency identification system. RFID Card 125khz( EM4100 ) is one of the most popular models in the proposed range of read only proximity cards, i. e. not offering the possibility to store data. Features : 125KHz TK4100 ID thin card. Proximity ID card support access control. Applications : Hotel keys. Security systems. Payment control. Access control.
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