V3.1.4
	- Mass production version, the first batch of mass production firmware

V3.1.5
	- Mass-produced version, the first batch of mass-produced firmware
	-  mass-produced version, found that the temperature below 0 degrees reading error, the program will run wrong, and modify the relevant issues

V3.1.6
	- Fixed 1 step non-turning problem, maximum force setting
	- 1st gear to turn off the out of step alarm, the maximum force

V3.1.7
	- Increase the load capacity