How to make arduino recognize a pair of numbers and turn on an led.

hello all, title may bit confusing have 2 numbers. rowstate ranges 1-5 , columnstate ranges 1-5. program first detects if "row button" hit. if 1 of 5 row buttons hit state of variable "rowstate" changes either 1-5 depedning on button hit. same columns. once hit row button , column button tell program print both of states see if works , does. question how light led 5 5 grid (max7219) using coordinates speak. if rowstate = 1 , columnstate = 1 , want have led (1,1) turn on. ideas, im still kind of beginner in arduino , i'm surprised got far project thankfull.




my code below if wondering.

code: [select]


#define referencevoltage a0
#define buttonrow a1
#define buttoncolumn a2

#define ledb 2
#define ledc1 3


  int voltage = analogread(referencevoltage);
  int whichrow = analogread(buttonrow);
 
  int rowstate = 0;
  int columnstate = 0;

void setup()
{
serial.begin(9600);

}

void loop() {
 
 
  while(rowstate == 0){
rowcheck();

}

while(columnstate == 0) {

columncheck();
}

serial.print("row =");
serial.println(rowstate);
serial.print("column =");
serial.println(columnstate);
delay(1000);

}

void rowcheck() {

int voltage = analogread(referencevoltage);
  int whichrow = analogread(buttonrow);

if (whichrow > .9*voltage) {
    serial.println("b");
    rowstate = 1;
    delay(250);
 
  }
  else {
    if (whichrow > .7*voltage) {
serial.println("i");
rowstate = 2;
delay(250);
    }
  else {
    if (whichrow > .5*voltage) {
    serial.println("n");
    rowstate = 3;
    delay(250);
  }
  else {
    if (whichrow > .3*voltage) {
    serial.println("g");
    rowstate = 4;
    delay(250);
  }
  else {
    if (whichrow > .1*voltage) {
    serial.println("o");
    rowstate = 5;
    delay(250);
  }
  else {
    serial.println("nothin hit");
    delay(250);}
  }
  }
  }
  }
}


void columncheck() {

int voltage = analogread(referencevoltage);
  int whichcolumn = analogread(buttoncolumn);

if (whichcolumn > .9*voltage) {
    serial.println("1");
    columnstate = 1;
    delay(250);
 
  }
  else {
    if (whichcolumn > .7*voltage) {
serial.println("2"); 
columnstate = 2;
delay(250);
    }
  else {
    if (whichcolumn > .5*voltage) {
    serial.println("3");
    columnstate = 3;
    delay(250);
  }
  else {
    if (whichcolumn > .3*voltage) {
    serial.println("4");
    columnstate = 4;
    delay(250);
  }
  else {
    if (whichcolumn > .1*voltage) {
    serial.println("5");
    columnstate = 5;
    delay(250);
  }
  else {
    serial.println("nothin hit");
    delay(250);}
  }
  }
  }
  }

}


ok, that's easy enough , there few ways it, common way use container "packet". want send data < value1 , value2 >. if first char '<', collect rest until serial monitor receives '>'. comma way split data multiple parts, need too.

so this.

quote

if(serial.available() > 0){
    char temp = serial.read(); // example incomming data <1,23,456,7890>
    if( temp == '<' ) // find char in buffer, , start collecting rest after it.
    {
    while( true ) // loop continuously gather rest of chars
     // serial.available , serial.read() here.

     //look @ incoming char , see if comma or end of container '>'
     // if in not comma or >, store char(s) temporary array
     // if char comma increment arrays index 1 store next char(s)

     // keep doing until incoming char > break out of while loop , should have data

i have working example if want take @ it.

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