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Project fingerprint attendance system12/21/2023 ![]() ![]() ![]() ![]() And PD7 is used as soft UART Tx pin for getting the current time. RTC module is connected at I2Cpin PC0 SCL and PC1 SDA. A 16×2 LCD is configured in 4-bit mode and its RS, RW, EN, D4, D5, D6, and D7 are directly connected at pin PB0, PB1, PB2, PB4, PB5, PB6, PB7 of microcontroller. 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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