A commonly used library is the DallasTemperature library, used to access DS18B20 sensors on a 1-Wire bus. When creating a DallasTemperature object you pass a reference to a OneWire object. OneWire can create a 1-Wire bus on pretty much any port of an Arduino.
An example of this is like so:
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs) OneWire oneWire(ONE_WIRE_BUS); // Pass our oneWire reference to Dallas Temperature. DallasTemperature sensors(&oneWire);
However, there are some issues with using OneWire to drive a 1-Wire bus, mainly around driving longer bus lengths, dealing with shorts, and other errors.
There is a commonly available chip called the DS2482-100 that can drive longer busses (hundreds of feet), deals with shorts and other errors. It is also less CPU heavy and it deals with a number of the slower aspects of 1-Wire.
For this reason, I would like to be able to pass a reference to a library that I have created instead. Currently, I am doing this by:
- Calling the library OneWire
- Replicating all the methods called by the DallasTemperature library
- Swapping out the OneWire library for mine
This is relatively messy. I would ideally like to be able to pass either a reference to my library or a 1-Wire library, so that people can chose which interface to use.
How would I go about doing this?