Switched from 'WSWire' library to 'Wire' library for I2C communications

Merge pull request #6 from nadavmatalon/wire

Switched from 'WSWire' library to 'Wire' library for I2C communications

Namespace

Added namespaces to prevent conflicts with other libraries

Switch from using String class to lighter PString Class

Changed auxiliary functions: MCP9802InfoStr() and MCP9802ComStr() to work with the PString class instead of the String class to further reduce memory footprint. For this purpose, added PString.h & PString.cpp files to /utility folder. In addition added "I2C STATUS" (CONNECTED / NOT CONNECTED) field to device information string.

License Change to MIT

License was changed from GNU (GPL) to MIT

Functionality Change: Hysteresis & Limit Value Setting

Small change in functionality: attempting to set hysteresis or limit beyond the legitimate range (-55°C - 125°C / -67°F - 257°F) now sets the register to the maximum/minimum allowable value rather than do nothing.

Fully Tested MCP9802 Driver Library for Arduino

The MCP9802 is a 9 to 12-Bit Single-Channel Temperature Sensor with Hysteresis & Limit (i.e. Alert) capabilities, as well as a hardware I2C interface.

This library contains a robust driver for the MCP9802 that exposes its entire functionality (i.e. Configuration, Temperature, Hysteresis, Limit, and Alert Settings), allowing the end-user to get/set data in degrees Celsius or Fahrenheit.