Serial ASCII conversion to int

today, arduino arrived , first big project require serial data flow both directions. serial out computer looks relatively easy, i'm struggling sending serial data arduino.

the first mini-project i'm trying typing number ide serial box , dimming led accordingly.
i can type numbers 0-9 , appropriate values, when type multi-digit number, numbers individually can use values 0 9.
i know need somehow buffer data , maybe concatenate numbers char or string convert whole thing int, i'm unsure how this.

i've been searching arduino site , googling, haven't found tutorial or better explains conversion process.

here's relevant code of (everything else loop/setup definitions etc.:

code: [select]


char analogvalue = '0';

  if(serial.available()>0)
  {
    analogvalue=serial.read();
    serial.println(analogvalue);
    analogwrite(4,analogvalue);
    //serial.flush();
  }  

storing char seems work , said, single values not entire number.
thanks in advance help.
matt

i wrote method earlier today:
http://www.arduino.cc/cgi-bin/yabb2/yabb.pl?num=1273230655/2#2

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