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| A Sub-circuit is a stand
alone circuit function consisting of a software module and schematic. |
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Qwerty 36-keypad
Description
36-key QWERTY keypad based on the Storm 700 series sealed
rugged keypad. Supports shift, caps and control function keys.
Software functions
QWERTY_DO() : Key pad scan routine.
Call at regular
intervals (eg 1ms timer tick interrupt)
QWERTY_KEY() : returns the currently pressed ascii key
QWERTY_NEWKEY() : returns the most recently pressed ascii
key. Subsequent calls return 0 until a new key is pressed
QWERTY_CAPS() : returns true if capitals locked else
false.
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Schematic
Projects
This sub-circuit is demonstrated in the following projects:
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'I2C QWERTY 36-Keypad' more
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Keypad 16 x 4
Description
keypad 1-16 columns x 4 rows.
Software functions
KEYPAD_DO() : Keypad scan routine. Call at regular
intervals (eg 1ms)
KEYPAD_KEY() : returns the currently pressed key
scan number.
KEYPAD_NEWKEY() : returns the most recently pressed key
scan number. Subsequent calls return 0 until a new
key is pressed
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Schematic
Similar sub-circuits:
Keypad 4 x 4
Keypad 3 x 3
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Keypad 4 x 3 (low scan)
Description
keypad 12keys, 4rows, 3cols interrupt driven 'low scan'. Uses
PORTB interrupts to detect key press and perform scan.
Software functions
KEYPAD_NEWKEY() : returns new key no.
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Schematic
Similar sub-circuits:
Keypad 4 x 4 (low scan)
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Keypad 4 x 3
Description
keypad 12keys, 4rows, 3 cols
Software functions
KEYPAD_NEWKEY() : returns new key no.
KEYPAD_SCAN() : returns current key
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Schematic
Similar sub-circuits:
Keypad 4 x 4
Keypad 3 x 3
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Push switch SPNO,PU
Description
Push to make switch with resistor pull up
Software functions
SW_PRESSED() : returns switch pressed event
SW_STATE() : returns state 0=up, 1=down
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Schematic
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