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75 lines
2.4 KiB
Markdown
75 lines
2.4 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/AnalogKeypad/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/AnalogKeypad/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/AnalogKeypad/blob/master/LICENSE)
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[](https://github.com/RobTillaart/AnalogKeypad/releases)
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# AnalogKeypad
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Library for (Robotdyn) 4x4 and 4x3 analog keypad.
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## Description
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AnalogKeypad is a simple library to read the keys from a (Robotdyn) 4x4 or 4x3 keypad.
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No other keypads are tested, but they should work with this library after adjusting
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the **MAGIC NUMBERS** in the function **rawRead()**.
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## Interface
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### Constructor
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- **AnalogKeypad(const uint8_t pin, const uint8_t bits = 10)** constructor, pin is typical A0 etc.
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Bits has a default of 10, but need to be set to match the platform.
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If bits < 8 then the internal shift would be large causing all reads to return 0 or so.
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### polling interface
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- **uint8_t pressed()** returns 0 if no key pressed, otherwise returns key pressed (may fluctuate).
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- **uint8_t read()** read the key pressed returns 0 .. 16 where 0 means NOKEY.
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### event interface
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- **uint8_t event()** checks if a change has occurred since last time.
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- **uint8_t key()** returns the key involved with last event.
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Switch(int e = event())
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| Event | value |
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|:--------:|:-----:|
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| PRESSED | 0x80 |
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| RELEASED | 0x40 |
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| REPEATED | 0x20 |
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| CHANGED | 0x10 |
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| NOKEY | 0x00 |
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## Operation
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The simplest usage is to use the **read()** function.
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This will return a 0 (NOKEY) when no key is pressed and
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a number 1 to 16 for the keys pressed. Note the return value may
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fluctuate randomly when multiple keys are pressed.
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The **pressed()** function is a bit more robust.
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It returns the key pressed first, so multiple key presses simultaneously
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are less likely to disturb your program.
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See Examples
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## Future
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- more examples
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- self-learning example?
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- make internal mapping array runtime adaptable?
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- store in RAM, accessor functions
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-
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