> thought it would be nice to show
> the speed as a bargraph ?
>
> My problem, is that I cannot think how to get started

Hello,

I have done this for a Volume display on my car MP3 player.

I shall assume thet you know how to control the disply and write
characters to it.

1) Define some special characters.  These will go in the User Defined
ares of the LCD module, and can be used by sending the appropriate
character code.
The characters should represent 1 and 2 vertical bars.  Each character
cell on the LCD is 5 pixels wide, and each cell is seperated from its
neighbour by a 1 pixel gap.  If you define a character that is like
this:

00011
00011
00011
00011
00011
00011
00011

or this

11000
11000
11000
11000
11000
11000
11000

(depending on which way your bargraph goes)

and this

11011
11011
11011
11011
11011
11011
11011

then you can represent 1/2 cell steps in your bargraph.  Alternatively
you can define a solid block and just have whole cell steps.

2) Think about how you will map your speed to the bargraph.  You have 16
character cells.  If they are all full then you will be representing
full speed, or 100%.  If they are all blank you will be representing 0%.
 Each cell represents 6.25% when full, or 3.125% when half full, unless
you put characters like 0 and 100 at either end.

3) Figure out the maths so that when you have a number which is to be
displayed on the bargraph you calculate how many full cell characters
you need, and whether the last one is a half cell or blank.

4) Send the appropriate characters to the screen.

Does this help?

Andy

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