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102 lines
3.4 KiB
Markdown
102 lines
3.4 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/AD524X/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/AD524X/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/AD524X/blob/master/LICENSE)
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[](https://github.com/RobTillaart/AD524X/releases)
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# AD524X
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Arduino class for I2C digital potentiometer AD5241 AD5242.
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## Description
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The AD5241 and AD5242 are two digital potentiometers.
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The AD5241 has one, the AD5242 has two potentiometers.
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Both types have two output lines O1 and O2.
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These digital potentiometers come in 10K, 100K and 1M
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and can be set in 256 steps.
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An important property of the devices is that they defaults
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to their mid position at startup.
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#### Related libraries
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This library is related to - https://github.com/RobTillaart/AD5245
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The AD5245 is a single port digital potentiometer.
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## I2C address
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The AD524X has two address lines to configure the I2C address. 0x2C - 0x2F
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| Addr(dec)| Addr(Hex) | AD0 | AD1 |
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|:--------:|:---------:|:----:|:----:|
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| 44 | 0x2C | GND | GND |
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| 45 | 0x2D | GND | +5V |
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| 46 | 0x2E | +5V | GND |
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| 47 | 0x2F | +5V | +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 (both) the potentiometer(s), and the O1 and O2 lines.
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### Constructors
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- **AD524X(uint8_t address, TwoWire \*wire = &Wire)** base class,
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creates an instance with 2 potentiometer.
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This class does not distinguish between AD5241 and AD5242.
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The developer is responsible for handling this correctly.
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- **AD5241(uint8_t address, TwoWire \*wire = &Wire)** create an instance with 1 potentiometer.
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- **AD5242(uint8_t address, TwoWire \*wire = &Wire)** create an instance with 2 potentiometer.
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### Wire initialization
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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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### Basic IO
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- **uint8_t write(uint8_t rdac, uint8_t value)** set channel rdac 0/1 to value 0..255.
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- **uint8_t write(uint8_t rdac, uint8_t value, uint8_t O1, uint8_t O2)** idem + set output lines O1 and O2 too.
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- **uint8_t read(uint8_t rdac)** read back set value.
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- **uint8_t setO1(uint8_t value = HIGH)** value = HIGH (default) or LOW.
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- **uint8_t setO2(uint8_t value = HIGH)** value = HIGH (default) or LOW.
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- **uint8_t getO1()** read back O1 line.
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- **uint8_t getO2()** read back O2 line.
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### Misc
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- **uint8_t zeroAll()** sets potentiometer's to 0 and I/O to LOW.
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- **uint8_t reset()** sets potentiometer's to midpoint = 127 and I/O to LOW. (startup default)
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- **uint8_t midScaleReset(uint8_t rdac)** resets one potentiometer to midpoint = 127.
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- **uint8_t readBackRegister()** read register back, for debugging.
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### Experimental
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- **uint8_t shutDown()** check datasheet, not tested yet, use at own risk.
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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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- improve error handling.
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- sync with AD520X library
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