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99 lines
3.1 KiB
Markdown
99 lines
3.1 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/HC4051/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/HC4051/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/HC4051/blob/master/LICENSE)
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[](https://github.com/RobTillaart/HC4051/releases)
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# HC4051
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HC4051 is an Arduino library for a HC4051 1x8 channel multiplexer.
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## Description
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HC4051 is a library to control the CD74HC4051 8 channel
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multiplexer / demultiplexer and compatible devices.
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The HC4051 allows e.g one analog port read up to 8 different analog channels,
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or one digital port to read the state of 8 buttons.
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The channel selection is done with four select lines **A, B, C**
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The device can be enabled/disabled by the enable line **INH**
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#### Compatibles
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to elaborate.
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#### Related to
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- https://github.com/RobTillaart/HC4051 (1x8 mux)
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- https://github.com/RobTillaart/HC4052 (2x8 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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## Hardware connection
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Typical connection is to connect the four **select pins** to four IO Pins of your board.
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The optional **enablePin (INH)** must be connected to GND if not used.
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This way the device is continuous enabled.
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Example multiplexing analog in.
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```
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processor HC4051
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+-------------+ +-------------+
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| A |------------->| S0 Y0 |
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| B |------------->| S1 Y1 |
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| C |------------->| S2 Y2 |
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| | | Y3 |
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| E |------------->| INH Y4 |
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| | | Y5 |
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| A0 |<-------------| Y Y6 |
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| | | Y7 |
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| GND |--------------| GND Y8 |
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| | | VCC |
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+-------------+ +-------------+
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```
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## Interface
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```cpp
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#include "HC4051.h"
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```
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#### Core
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- **HC4051(uint8_t A, uint8_t B, uint8_t C, uint8_t enablePin = 255)** constructor.
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Set the three select pins and optional the enable pin.
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If the enablePin == 255 it is considered not used.
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- **void setChannel(uint8_t channel)** set the current channel.
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Valid values 0..7, this value is not checked, only the lower 3 bits will be used.
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- **uint8_t getChannel()** get current channel 0..7.
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#### Enable
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These functions work only if enablePin is set in the constructor.
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- **void enable()** idem.
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- **void disable()** idem.
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- **bool isEnabled()** idem.
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Also returns true if enablePin is not set.
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## Future
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- keep in sync with HC4067 et.al.
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