Sensor_SHT85: handle multiple sensors and multiple wires and multiple I2C modules

[mitra42]

Sensor_SHT85 is tested for a single sensor - my test hardware is a SHT30 shield plugged into an Lolin D1 mini, using its default address of 0x45

It would be a more generically useful module if it could.

• [x] a: support multiple sensors - e.g. one at 0x45 and one at 0x44
• [ ] b: support multiple wires - e.g. a sensor at 0x45 on one set of pins, and another on a different set of pins
• [ ] c: was able to work with other sensors on the same I2C - i.e. not restarting the Wire.

This will require some cleverness - some notes below.

[mitra42]

a: support multiple sensors - e.g. one at 0x45 and one at 0x44

How do we load the module twice, ideally without duplicating the code. I can see different ways to tackle this, but they might not work a1: via defines so the module is loaded more than once, but I don't think this will work well with the way the Arduino IDE compiles each cpp, the cpp file isnt "included" like the .h is. a2: splitting the sensor_SHT85 into something like a library that exists once and something trivial that can be loaded multiple times that calls it (like sensor_SHT85 itself calls the SHT library). But we still have the challenge of how to do this structurally.

UPDATE: Solved by a different method - passing an _ARRAY version of the addresses to sensor_SHT85.cpp this should be extendable to other sensors

[mitra42]

c: was able to work with other sensors on the same I2C - i.e. not restarting the Wire.

I think the wires can be supported by splitting the Wire setup into a separate module (system_wire) and only including its header and setup() if any module that needs it is used. (this would happen in _settings.h)

[mitra42]

b: support multiple wires - e.g. a sensor at 0x45 on one set of pins, and another on a different set of pins

This is a similar problem to "a1" we need to include multiple instances of the Wire and setup() them all.

[mitra42]

This module has been reorganized to make it easier to do things like above. Now defines a wrapper class for the SHT85 library