This is keyboard user interface using LCD 5110 and Arduino. It has 4 navigation buttons and 2 buttons for select the character or erase option. It's look like this:
The connection:
Arduino Pro Mini - Button
D2 - Left
D3 - Right
D10 - UP
D11 - Down
D9 - Select
D12 - Back
Don't forget add 10K resistor for each digital pin used to the ground (So that there is no floating digital value)
I'm using Adafruit_GFX.h library. The LCD 5110 connection was default
Arduino - LCD 5110
(8, 7, 6, 5, 4) - (SCLK, Din, DC, CE, Reset)
This keyboard was inspired by Gamebuino classic keyboard
The script (.ino):
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