2.8 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.
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/AD5246/
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(uint8_t sda, uint8_t scl) ESP32 a.o initializing of Wire.
- 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