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77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/AD5245/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/AD5245/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/AD5245/blob/master/LICENSE)
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[](https://github.com/RobTillaart/AD5245/releases)
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# AD5245
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Arduino library for I2C single channel digital potentiometer AD5245.
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The library is experimental and not tested yet.
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## Description
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The AD5245 is a single channel digital potentiometer which comes in
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10K, 100K and 1M and can be set in 256 steps.
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An important property of the device is that it defaults
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to the mid position at startup.
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One can use **AD5245_MIDPOINT** == 128 to reset to the mid position.
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#### Related libraries
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This library is based upon the AD524X library, and triggered by this issue:
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- https://github.com/RobTillaart/AD524X/issues/11
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## I2C address
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The AD5245 has one address line to configure the I2C address.
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| Addr(dec)| Addr(Hex) | AD0 |
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|:--------:|:---------:|:-----:|
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| 44 | 0x2C | GND |
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| 45 | 0x2D | +5V |
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## Interface
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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 potentiometer.
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- **AD5245(uint8_t address, 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 potentiometer to midpoint = 128. (startup default)
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- **uint8_t write(uint8_t value)** set to value 0 .. 255.
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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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- **uint8_t shutDown()** check datasheet, not tested yet, use at own risk.
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## Error codes
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| define | value |
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|:---------------|:-------:|
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| AD5245_OK | 0 |
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| AD5245_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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- sync with AD520X library
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- sync with AD524X library
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- reset ==> midScaleReset() ? AD524X alike
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