LocalgHost:
would it be wise to use something like controllerprojects.com determine the SRAM usage ?
That would be helpful however...
freeRam returns (total memory) - (static data) - (stack space) - (heap). For the first optimization pass you should focus just on static data (like string constants). That's the part that you have the most control over. The simplest way to determine static data size is with a command-line program named avr-size. There have been several posts on this forum about how to use it. After searching, if you cannot find anything helpful, report back.