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126 lines
3.8 KiB
Markdown
126 lines
3.8 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/HC4067/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/HC4067/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/HC4067/blob/master/LICENSE)
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[](https://github.com/RobTillaart/HC4067/releases)
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# HC4067
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HC4067 is an Arduino library for a HC4067 16 channel multiplexer.
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## Description
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HC4067 is a library to control the CD74HC4067 16 channel
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multiplexer / demultiplexer and compatible devices.
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The HC4067 allows e.g one analog port read up to 16 different analog channels,
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or one digital port to read the state of 16 buttons.
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The channel selection is done with four select lines **S0..S3**
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The device can be enabled/disabled by the enable line **E**
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#### Compatibles
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Not tested, considered compatible.
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- CD74HC4067, 74HC4067, 74HCT4067
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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 E** 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 HC4067
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+-------------+ +-------------+
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| S0 |------------->| S0 Y0 |
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| S1 |------------->| S1 Y1 |
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| S2 |------------->| S2 Y2 |
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| S3 |------------->| S3 Y3 |
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| | | Y4 |
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| E |------------->| Enable Y5 |
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| | | Y6 |
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| | | Y7 |
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| A0 |<-------------| Z Y8 |
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| | | Y9 |
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| | | Y10 |
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| | | Y11 |
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| | | Y12 |
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| | | Y13 |
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| GND |--------------| GND Y14 |
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| | | VCC Y15 |
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| | | |
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+-------------+ +-------------+
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```
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## Interface
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```cpp
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#include "HC4067.h"
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```
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#### Core
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- **HC4067(uint8_t s0, uint8_t s1, uint8_t s2, uint8_t s3, uint8_t enablePin = 255)** constructor.
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Set the 4 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..15, this value is not checked, only the lower 4 bits will be used.
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- **uint8_t getChannel()** get current channel 0..15.
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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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#### Must
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- elaborate documentation
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- links etc.
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#### Should
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- optimizations
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- performance setChannel
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- investigate how to use with only 3 lines or 2 lines.
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- set s3 / s2 to LOW always or so
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#### Could
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- next() and prev() as channel selector.
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- internal channel variable needed.
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- move code to .cpp file
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- investigate
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- can it be used as 16 channel OUTPUT (yes but)
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- is it buffered?
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#### Won't (unless requested)
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- optimizations
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- only do digitalWrite when changed? gain is minimal.
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- now takes 24 micros on UNO if set.
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