1.When the key in the sending part is pressed by someone, the 1602LCD will display the value of the key.

2.The value of the key will stay on the 1602LCD until other key is pressed. The 1602LCD will refresh and display the value of the new key.

Code for your reference

Step 1: Components list

1.ICStation ATMEGA328 UNO V3.0 R3 Board Compatible Arduino UNO R3

2.ICStation ATMEGA2560 Mega2560 R3 Board Compatible Arduino

3.NRF24L01+2.4GHz Wireless Transceiver Module for Arduino MCU

4.For Arduino IIC/I2C/TWI 1602 Serial LCD Module Display

5.4 x 4 Matrix Array 16 Key Membrane Switch Keypad Keyboard

6.Dupont 20cm Color Cable Line 1p-1p Pin Connector

7.Pin Header

Step 2: Schematic diagram of sending part

Step 3: Schematic diagram of receiving part

Step 4: The connection of sending part

1.Connect NRF24L01 wireless transceiver module to Mega2560

SCK--Digital pin 52 ;MOSI-- Digital pin 51
MOSI--Digital pin 50;CS——Digital pin 9 CE——Digital pin 8

2.Connect the keyboard to the 0-7 pin of Mega2560

Step 5: The connection of receiving part

1.Connect NRF24L01 Wireless Transceiver Module to ICStation UNO
SCK--Digital pin 13 ;MOSI-- Digital pin 11 MOSI-- Digital pin 12 ;CS——Digital pin 7

CS——Digital pin 8

2.Connect 1602LCD to the ICStation UNO


Step 6: Video to show the effect