SW1 used for check the available balance and SW2 used for withdraw amount from the card. Any RFID tag can be used but we must know its ID so that we can enter it to the program and assign a pin to it. Only Tx pin of reader will be connected to Rx pin of MC. Check the network LED on module and if network available then modem is now ready.

We also must put a SIM inside the microcontroller with balance or SMS pack. We connect Tx pin of GSM to Rx pin(P3^0) of MC and Rx pin of GSM with Tx pin(P3^1) of MC. GSM module have 3 pins named Tx, Rx and GND available on the module. 4 pins for 4 rows and 3 pins for 3 columns.4 rows are connected to P0^0 to P0^3 and 3 columns are connected with P0^4 to P0^6 of MC. circuit diagram of LCD and 8051 MC connection is shown below.Ī matrix keypad has 7 pins. Pin 3 will be connected with a variable resistor for adjusting brightness. Pin no 1& 16 of LCD connect with ground and Pin no. RS, RW & EN connect with P1^0, P1^1 & P1^2 respectively. 16×2 LCD:Ĭonnect 8 data pins of LCD with P2 of 89s52 microcontroller D0 with P2.0 and so on. Assembling circuits on PCB minimizes the time and error.įirstly, you must connect all the components according to circuit diagram provided. Construction and testingīy following the circuit diagram shown above we can design PCB using Proteus software else we can design the circuit using dotted board also. My_atoi() – ASCII to integer function used for convert string to integer. Wrong() – It displays if wrong PIN entered. Keypad() – Reads the data entered from Keypad.Īccept() – If correct PIN entered it shows authentication. Rxdata() – Receives data from RFID reader and stores in a variable. Uart_init() – Initialize serial communication with peripheral devices. Lcd_init() – Initialize the LCD for displaying content. Lcdstring() – Used for Display string on LCD. Lcd_num() – Used for Display numbers on LCD. Lcddata() – Used for sending DATA to LCD.

Lcdcmd() – Used for sending command to LCD.

The C program and its hex file are available for download Functions used in program:ĭelay() – This function used to generate a delay of required time. Keil Compiler is used for compiling the code and progisp with usb programmer is used to burn the program in the microcontroller’s ROM memory. We are using C program to control the hardware.

Em18 rfid reader library for proteus