1. in this routine, you can set the brightness level (0-7)

2. characters can be displayed 0-9,a,b,c,d,e,f,-

3. can be set in a few decimal points are displayed on, function dotShow (): (set to 1-4)

4. key features

left key:the first digital tube +1

up key:the second digital tube +1

right key:the third digital tube +1

donw key:the fourth digital tube +1

select key:the fifth digital tube +1

