for instance Arduino, you would need atleast 6 I/O pins to talk to the LCD. However, if you use an LCD module with I2C interface, you only need 2 lines to process the display information. Now a days, ...

Plug the RFID module into the breadboard with enough space around it. Connect the VCC pin to the Arduino's 3.3V (not 5V), and ...

The I2C bus or TWI (Two Wire Interface ... connected in series to pin A4 and A5 on the Arduino board. The two 4.7K pull-up resistors must be used when using I2C communication. We use the serial ...