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94 lines
2.8 KiB
Markdown
94 lines
2.8 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/AD5246/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/AD5246/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/AD5246/blob/master/LICENSE)
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[](https://github.com/RobTillaart/AD5246/releases)
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# AD5246
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Arduino library for I2C single channel digital rheostat AD5246.
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The library is experimental and not tested with hardware yet.
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## Description
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The AD5246 is a single channel digital rheostat which comes in
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5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ and can be set in 128 steps.
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Indicative step size.
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| value | step size |
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|:--------:|:-----------:|
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| 5 kΩ | 39.06 Ω |
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| 10 kΩ | 78.13 Ω |
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| 50 kΩ | 390.6 Ω |
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| 100 kΩ | 781.3 Ω |
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An important property is that the device defaults to the mid-scale position at startup.
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One can use **AD5246_MIDPOINT** == 64 to reset to the mid-scale position.
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#### Related
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This library is based upon the AD5245 library.
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- https://www.analog.com/en/products/ad5246.html
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- https://github.com/RobTillaart/AD520X/
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- https://github.com/RobTillaart/AD524X/
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- https://github.com/RobTillaart/AD5245/
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- https://github.com/RobTillaart/AD5246/
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## I2C address
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The AD5246 has one fixed address 0x2E.
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If one needs more AD5426 on one I2C bus one need a I2C multiplexer
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- https://github.com/RobTillaart/TCA9548
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The maximum I2C speed is 400 KHz.
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## Interface
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```cpp
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#include AD5246.h"
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```
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The library has a number of functions which are all quite straightforward.
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One can get / set the value of the rheostat.
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- **AD5246(TwoWire \*wire = &Wire)** constructor
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- **bool begin(uint8_t sda, uint8_t scl)** ESP32 a.o initializing of Wire.
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- **bool begin()** for UNO.
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- **bool isConnected()** See if address set in constructor is on the bus.
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- **uint8_t reset()** sets rheostat to midpoint = 64. (startup default)
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- **uint8_t write(uint8_t value)** set to value 0 .. 127.
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Values > 127 will be mapped upon 127.
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- **uint8_t read()** read value from cache.
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- **uint8_t readDevice()** read value from device.
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Note the AD5426 does not have a **shutdown()** command like the AD5245.
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## Error codes
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| define | value |
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|:---------------|:-------:|
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| AD5246_OK | 0 |
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| AD5246_ERROR | 100 |
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## Operation
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The examples show the basic working of the functions.
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## Future
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- keep in sync with AD5245 library
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