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#kPad_i2c Wiki
HARDWARE REQUIREMENTS.
- Any keypad with 8(or less)-pins connector Pic 1-3. I will assume to work with a keypad has 8-pins connector Pic 4.
- I2C/TWI adapter for LCD (like 16x2 or 20x4) with PCF8574 interface chip (or any 8-bit I/O expander may be accepted, look at his reference) Pic 5.
- Jumper wires and four 1kOhm resistors.
Last two items are needed to realize keypad behind an i2c converter.
SOFTWARE FEATURES.
Methods:
- init() acepts a parameter only when you realize i2c interface (i2c adapter address).
- setDelay() - non-blocking method (simply ignores your input during a delay time), sets up a delay magnitude. There is a default delay (250 msec). If you don't like the delay, set another. There isn't an input verifying, so use only sanity values of msecs (from 100 to 500 for example).
- read() returns a token of a pressed key.
INSTALL.
To use the library in a sketch, select it from Arduino IDE's menu Sketch > Import Library > Add Library.
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