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Online fingerprint attendance system11/3/2023 ![]() ![]() 5v supply is used for powering the whole circuit by using LM7805 voltage regulator which is powered by 12v dc adaptor. Fingerprint module’s Rx and Tx directly connected at Serial pin PD1 and PD3 of microcontroller. And a LED is connected at pin PC2 of microcontroller with respect to ground through a 1k resistor. As shown in the circuit diagram, push or membrane buttons are directly connected to pin PA2 (ENROL key 1), PA3(DEL key 2), PA0(UP key 3), PA1(DOWN key 4) of microcontroller with respect to the ground or PA4.
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