Creating variables as a variable...

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hi ,
I am currently working on a lapcounter for time measuring purposes. Now the simple time measuring work pretty well and the data is shown on a 2 line LCD display. There is no connection to a PC via RS232 yet.

What I am now tring is to store the laptimes in the arduino in order to flip through the laptimes i.e. after the race. Obviously I want to keep the system flexible. So the number of laps counted shall not be limited. To store the data I need to have a variable related to the lap...and the highest lapnumber is unknown.
So something like that would be ideal

elapsed_time = (millies()- starttime);  //get the laptime
lapcount = lapcount +1;                     // get the lap
x = lapcount;               //let's take X=52 as example
int laptime(x);              // define variable with lap...HERE IS THE ISSUE
laptime52= elapsed_time;

Is that just silly or is here a possible solution?

2

You need to read about arrays, or linked lists (not recommended, given limited memory)

3

So working with arrays I would need to give the arduino an array of 250 :o (what I would call a maximum) and fill it with data afterwards?
Filling in millis would overfill the RAM, wouldn't it?

4

would need to give the arduino an array of 250

If that's the maximum number of laps, yes.
250 "long"s would take up just short of 1Kbytes of RAM.

5

Dear AWOL,
thanks for your hints. That was very helpful! [smiley=happy.gif]

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