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92 lines
2.9 KiB
Markdown
92 lines
2.9 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/74HC154/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/74HC154/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/74HC154/issues)
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[](https://github.com/RobTillaart/74HC154/blob/master/LICENSE)
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[](https://github.com/RobTillaart/74HC154/releases)
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[](https://registry.platformio.org/libraries/robtillaart/74HC154)
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# 74HC154
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Arduino library for the 74HC154 4-to-16 line decoder/demultiplexer.
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## Description
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This library controls the 74HC154 4 to 6 line decoder.
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With 4 IO lines one can select one of 16 output lines.
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#### Related
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- https://github.com/RobTillaart/74HC138 (3 to 8 selector)
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- https://github.com/RobTillaart/74HC154 (4 to 16 selector)
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- https://github.com/RobTillaart/HC4051 (1x8 mux)
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- https://github.com/RobTillaart/HC4052 (2x4 mux)
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- https://github.com/RobTillaart/HC4053 (3x2 mux)
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- https://github.com/RobTillaart/HC4067 (1x16 mux)
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## Interface
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```cpp
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#include "74HC154.h"
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```
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#### Constructor
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- **74HC154(uint8_t pin0, uint8_t pin1, uint8_t pin2, uint8_t pin3, uint8_t pinEnable = 255)**
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set the 4 selection IO lines from pin numbers.
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Optionally set the enable pin, connect to E1 or E2, see datasheet.
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- **74HC154(uint8_t \* pins, uint8_t pinEnable = 255)**
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set the 4 selection IO lines from an array.
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The pins array should have at least 4 elements.
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Optionally set the enable pin, connect to E1, see datasheet.
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#### Select line
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- **bool setLine(uint8_t line)** set line 0 .. 15. Returns false if out of range.
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- **uint8_t getLine()** returns 0 .. 15
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- **void nextLine()** selects the next line, wraps back to 0 if needed.
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- **void prevLine()** selects the previous line, wraps to 15 if needed.
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#### Enable
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Works only if enable line is set in constructor.
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- **void enable()** enables output / selection.
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- **void disable()** disables output / selection.
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- **bool isEnabled()** checks if line is enabled.
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## Future
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#### Must
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- improve documentation
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- get hardware to test
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#### Should
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#### Could
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#### Wont
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## Support
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If you appreciate my libraries, you can support the development and maintenance.
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Improve the quality of the libraries by providing issues and Pull Requests, or
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donate through PayPal or GitHub sponsors.
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Thank you,
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