GY-63_MS5611/libraries/AD524X

AD524X

Arduino class for I2C digital potentiometer AD5241 AD5242 AD5280 AD5282.

Description

The AD5241, AD5242, AD5280 and AD5282 are digital potentiometers. The AD5241/80 has one, the AD5242/82 has two potentiometers. Both types have two output lines O1 and O2.

The main difference in the AD524x and AD528x series is the resistance. See the table below.

The AD5280/82 is compatible with AD5241/42 (based upon datasheet compare). The library provides separate classes for the AD5280/82 however these are not tested with actual hardware yet. Please let me know if you get the AD5280/82 classes working.

device	channels	steps	ranges KΩ
AD5241	1	256	10, 100, 1000
AD5242	2	256	10, 100, 1000
AD5280	1	256	20, 50, 200
AD5282	2	256	20, 50, 200

An important property of the devices is that they defaults to their mid position at startup.

The library defines AD524X_MIDPOINT == 127. To be used to set to defined mid-point.

0.5.0 Breaking change

The ESP32 specific begin(sda, scl) is removed. The user has to call Wire.begin() or equivalent himself before calling begin().

Related

• https://github.com/RobTillaart/AD520x
• https://github.com/RobTillaart/AD524X
• https://github.com/RobTillaart/AD5245
• https://github.com/RobTillaart/AD5248 (also AD5243)
• https://github.com/RobTillaart/AD5144A
• https://github.com/RobTillaart/AD5263
• https://github.com/RobTillaart/X9C10X

Compatibles ?

If you find compatible devices please let me know.

I2C address

The AD524X has two address lines to configure the I2C address. 0x2C - 0x2F

Addr(dec)	Addr(Hex)	AD1	AD0
44	0x2C	GND	GND
45	0x2D	GND	+5V
46	0x2E	+5V	GND
47	0x2F	+5V	+5V

Interface

#include "AD524X.h"

The library has a number of functions which are all quite straightforward. One can get / set the value of (both) the potentiometer(s), and the O1 and O2 output lines.

Constructors

• AD524X(uint8_t address, TwoWire *wire = &Wire) constructor base class, creates an instance with 2 potentiometer. This class does not distinguish between AD5241/42/80/82. The developer is responsible for handling this correctly.
• AD5241(uint8_t address, TwoWire *wire = &Wire) create an instance with 1 potentiometer.
• AD5242(uint8_t address, TwoWire *wire = &Wire) create an instance with 2 potentiometer.
• AD5280(uint8_t address, TwoWire *wire = &Wire) create an instance with 1 potentiometer.
• AD5282(uint8_t address, TwoWire *wire = &Wire) create an instance with 2 potentiometer.

Wire initialization

• bool begin() initialization of the object. Note the user must call wire.begin() or equivalent before calling begin().
• bool isConnected() See if the address set in constructor is on the I2C bus.
• uint8_t getAddress() returns address set in constructor, convenience.

Basic IO

• uint8_t write(uint8_t rdac, uint8_t value) set channel rdac 0/1 to value 0..255.
• uint8_t write(uint8_t rdac, uint8_t value, uint8_t O1, uint8_t O2) idem + set output lines O1 and O2 too.
• uint8_t read(uint8_t rdac) read back set value.
• uint8_t setO1(uint8_t value = HIGH) value = HIGH (default) or LOW.
• uint8_t setO2(uint8_t value = HIGH) value = HIGH (default) or LOW.
• uint8_t getO1() read back O1 line.
• uint8_t getO2() read back O2 line.

Misc

• uint8_t zeroAll() sets potentiometer's to 0 and I/O to LOW.
• uint8_t reset() sets potentiometer's to midpoint == 127 and I/O to LOW. (startup default)
• uint8_t midScaleReset(uint8_t rdac) resets one potentiometer to midpoint == 127.
• uint8_t readBackRegister() read register back, for debugging.

Experimental

• uint8_t shutDown() check datasheet, not tested yet, use at own risk.

Interface AD5421 + AD5280 specific

Since 0.4.1 the library supports writing explicit to port 0 as that is the only port.

• uint8_t write(const uint8_t value) set rdac 0 to value 0..255.
• uint8_t write(const uint8_t value, const uint8_t O1, const uint8_t O2) idem + set output lines O1 and O2 too.

Note that uint8_t write(rdac, value) and uint8_t write(rdac, value, O1, O2) can be called and return AD524X_ERROR if rdac > 0.

Error codes

define	value
AD524X_OK	0
AD524X_ERROR	100

Future

Must

• improve documentation.

Should

• verify the working of AD5280 and AD5282.
• improve error handling.
• sync with AD520X library.

Could

Wont

• make midpoint 128

Support

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Thank you,