| ADCButtons | A simple ADC 16 Buttons and 4x4 keypad library. |
| LettersKeypad | A simple 4x3 phonetic alphabet keypad library. |
| LiquidCrystalSerial | A simple 74hC595 shift register LCD driver. |
| MAX7219Segment | MAX7219/MAX7221 Digital Tube 7-Segment LED Display Library |