Try to avoid EEPROM footprint about ina HOT 1 OPEN

I've changed this from a "bug" to an "enhancement" because the way the library currently works is not incorrect, it is just different from what you would like to see. The addition of the ESP32 and ESP8266 devices came after the initial library was developed and considering the amount of free RAM these devices have (at least compared to an Atmel microprocessor) a generous allocation of 512B is made. This allocation is not done during class instantiation, as the library was developed to push all of the actual initialization into the begin() method rather than class instantiation. This gives greater flexibility at runtime where sometimes the hardware is not initialized by Arduino IDE at the point in time where the class is instantiated - many libraries use this "delay" tactic.

It would be possible to change this 512B allocation to a size of (expected_devices * instance size) to reduce the memory footprint.

Is there a specific problem that you are seeing, or is this more of a general discussion as to how to make the library more generally useable?

from ina.