4x4 keypad, TFT-LCD, STM32
Pressing the same button within the interval of 0.5 s enables switching between letters and numbers from the list of characters assigned to the same key .
- Bold: The characters on the button
- Italic: The assigned list of characters or actions obtainable by repeatable pressing the same key
- {}: The set of characters
| 1 : {1 <} | ABC2 : {A B C 2} | DEF3 : {D E F 3} | A : Add space |
| GHI4 : {G H I 4} | JKL5 : {J K L 5} | MNO6 : {M N O 6} | B : Break line |
| PRS7 : {P R S 7} | TUV8 : {T U V 8} | WXY9 : {W X Y 9} | C : Clear the previous position |
| * : {: *} | 0 : {0 Z} | # : { # Q} | D : Delete all |