3.7 KiB
AD5246
Arduino library for I2C single channel digital rheostat AD5246.
The library is experimental and not tested with hardware yet.
Description
The AD5246 is a single channel digital rheostat which comes in 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ and can be set in 128 steps.
Indicative step size.
| value | step size |
|---|---|
| 5 kΩ | 39.06 Ω |
| 10 kΩ | 78.13 Ω |
| 50 kΩ | 390.6 Ω |
| 100 kΩ | 781.3 Ω |
An important property is that the device defaults to the mid-scale position at startup. One can use AD5246_MIDPOINT == 64 to reset to the mid-scale position.
0.2.0 Breaking change
Version 0.2.0 introduced a breaking change. You cannot set the pins in begin() any more. This reduces the dependency of processor dependent Wire implementations. The user has to call Wire.begin() and can optionally set the Wire pins before calling begin().
Related
This library is based upon the AD5245 library.
- https://www.analog.com/en/products/ad5246.html
- https://github.com/RobTillaart/AD520x
- https://github.com/RobTillaart/AD524X
- https://github.com/RobTillaart/AD5245
- https://github.com/RobTillaart/AD5144A
- https://github.com/RobTillaart/AD5245
- https://github.com/RobTillaart/AD5263
- https://github.com/RobTillaart/X9C10X
- https://github.com/RobTillaart/AD5246/ rheostat
I2C address
The AD5246 has one fixed address 0x2E. If one needs more AD5426 on one I2C bus one need a I2C multiplexer
The maximum I2C speed is 400 KHz.
Interface
#include AD5246.h"
The library has a number of functions which are all quite straightforward. One can get / set the value of the rheostat.
- AD5246(TwoWire *wire = &Wire) constructor
- bool begin() for UNO.
- bool isConnected() See if address set in constructor is on the bus.
- uint8_t reset() sets rheostat to midpoint = 64. (startup default)
- uint8_t write(uint8_t value) set to value 0 .. 127. Values > 127 will be mapped upon 127.
- uint8_t read() read value from cache.
- uint8_t readDevice() read value from device.
Note the AD5426 does not have a shutdown() command like the AD5245.
Error codes
| define | value |
|---|---|
| AD5246_OK | 0 |
| AD5246_ERROR | 100 |
Operation
The examples show the basic working of the functions.
Future
- keep in sync with AD5245 library
Support
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Thank you,