T-962-improvements

PRs included in this release: #61 (float support for serial) #63 (float support for serial) #65 (TC2/3 used if TC0/1 absent) #67 (build fix for asm) #94 (DS18S20 support) (with an additional fix for a stray parenthesis) #112 (TC_EXTRA1 typo bugfix)

Travis-CI builds have been unbroken and #70 (schematics) has also been pulled in

Note that the resulting binary is again slightly exceeding...

Release v0.5.1

This release adds support for controlling the oven from a computer attached to the serial port (same one that's used for flashing). Also the computer software can directly generate graphs of the completed profile. See the Python code (https://github.com/UnifiedEngineering/T-962-improvements/blob/master/serial-control.py) for for details. Note that this is still work in progress and not finalized.

This release includes support to allow a DS1822 temperature sensor to be used as cold junction compensation sensor if a DS18B20 cannot be sourced.

To make such a slow baudrate possible without affecting timing the UART is now interrupt driven. Lots of other cleanup, including cleaner log output making it suitable for direct import into a spreadsheet for higher resolution plotting of the reflow profile performance:

If the UART acts...