Difference between revisions of "Universal 4x4 keypad"
From ScienceZero
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==Keypads== | ==Keypads== | ||
3 predefined keypads and one user definable keypad. Selectable binary, ASCII or key number output. | 3 predefined keypads and one user definable keypad. Selectable binary, ASCII or key number output. | ||
| − | + | Telephone Calculator User defined | |
| − | 1 2 3 A | + | 1 2 3 A 7 8 9 + 7 8 9 / |
| − | + | 4 5 6 B 4 5 6 - 4 5 6 * | |
| − | + | 7 8 9 C 1 2 3 * 1 2 3 - | |
| − | + | * 0 # D 0 . E / C 0 = + | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | 4 5 6 - | + | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | 7 8 9 | + | |
| − | + | ||
| − | + | ||
| − | C 0 = + | + | |
==Interface== | ==Interface== | ||
Revision as of 13:42, 11 March 2009
Keypads
3 predefined keypads and one user definable keypad. Selectable binary, ASCII or key number output.
Telephone Calculator User defined 1 2 3 A 7 8 9 + 7 8 9 / 4 5 6 B 4 5 6 - 4 5 6 * 7 8 9 C 1 2 3 * 1 2 3 - * 0 # D 0 . E / C 0 = +
Interface
- RS-232
- 16 to 43 478 Baud
- Data out and inverted data out for generating standard RS-232 voltages
- SPI
- 83.33 kHz with enable
- Parallel
- 4 bit parallel output of key number
- MIDI
Misc
- Selectable beep/LED
Pin assignment
- RB0-3 = Keyboard row output/Parallel data output
- RB4-7 = Keyboard column input
- RA0 = DATA (RS-232, SPI, MIDI)
- RA1 = CLOCK (SPI)
- RA2 = ENABLE (SPI, Parallel)
- RA3 = Beeper/LED
- RA4 = Not connected
Connection diagram for keypad
If the keypad is 3 keys wide; leave RB7 disconnected.
RB0---X---X---X---X--
| | | |
RB1---X---X---X---X--
| | | |
RB2---X---X---X---X--
| | | |
RB3---X---X---X---X--
| | | |
RB4 RB5 RB6 RB7
