The materials we used: 1 elegoo Uno R3, 1 membrane switch module and 8 m-m wires.
here, the uno is connected to the membrane switch module with the help of 8 m-m wires. when connecting to the uno board, we connect them to the digital output pins, D9-D2. we connect the first pin of the keypad to D9, the second pin to D8, the third pin to D7, the fourth pin to D6, the fifth pin to D5, The sixth pin to D4, the seventh pin to D3, and the eighth pin to D2.
these are the original codes.we changed all the keys and wrote a little message to you.
Embedded Systems blog, group 1 