Below is my full circuit connection
1) Arduino 4x4 keypad 2) Arduino I2C LCD
A0 1st pin A5 SCL
A1 2nd pin A4 SDA
A2 3rd pin GND GND
A3 4th pin 5V 5V
D2 5th pin
D1 6th pin
D0 7th pin
3) RC522 Module Arduino 4 ) Arduino GSM900 LED's Buzzer
SDA D10 D3 D7
SCK D13 D4 D8
MOSI D11 5V LED1
MISO D12 D8
PQ Not connected D7 LED2
GND GND D6 LED3
RST D9 D5 Positive
3.3V 3.3V GND GND Negative
SDA D10 D3 D7
SCK D13 D4 D8
MOSI D11 5V LED1
MISO D12 D8
PQ Not connected D7 LED2
GND GND D6 LED3
RST D9 D5 Positive
3.3V 3.3V GND GND Negative
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