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ZACwire protocol for MicroPython

MicroPython implementation of the ZACwire protocol used in the TSic 506F temperature sensor. One useful property of these sensors is that their nominal accuracy is excellent (±0.1 °C), which is necessary for some scientific applications (e.g., ensuring precise and accurate control of a chemical reaction's temperature).

The pyboard implementation is based on IRQs and a Timer, and seems to work reliably.

The esp32 implementation is also based on IRQs and a Timer. It stores a buffer of the 15 past readings and reports a temperature corresponding to the median of these readings. To change the buffer length, simply edit MEM_LEN and MEM_HALF_LEN in zacwire.py`.

The RP2040 implementation uses two PIO state machines and also seems quite reliable. Thanks to Robert Hammelrath for his RP2040 Examples.