Conversion from Hex to RGB

Troubleshooting
12

Hey @tchinou1,

I did the same thing: taking a http request as a HEX String and convert it to 3 INTs.

String color = raw_response.substring(43+3+27,44+3+27+5);//the HEX color in the msg: RRGGBB
Serial.println(color);

String Tcolor;
int Rcolor;
int Gcolor;
int Bcolor;
int temp;
char C_color;

//HEX char to INT - Red color
C_color = color[0];
Rcolor = hexToDec(C_color,1);
C_color = color[1];
Rcolor = (hexToDec(C_color,0)) + Rcolor;
Serial.println(Rcolor);

//HEX char to INT - Green color
C_color = color[2];
Gcolor = hexToDec(C_color,1);
C_color = color[3];
Gcolor = (hexToDec(C_color,0)) + Gcolor;
Serial.println(Gcolor);

//HEX char to INT - Blue color
C_color = color[4];
Bcolor = hexToDec(C_color,1);
C_color = color[5];
Bcolor = (hexToDec(C_color,0)) + Bcolor;
Serial.println(Bcolor);

and

int hexToDec(char hexString,int x) {
  
  int decValue = 0;
  int tempvalue =0;
  
  if ((hexString != 'A') && (hexString != 'B') && (hexString != 'C') && (hexString != 'D') && (hexString != 'E') && (hexString != 'F')){
      
      int tempvalue = hexString - '0';
      if (x==1){
        decValue=tempvalue *16;
      } else {
          decValue=tempvalue + decValue;
      }
    }
    
    else {
        if (hexString == 'A'){
        tempvalue=10; } 
        if (hexString == 'B'){
          tempvalue=11; }
        if (hexString == 'C'){
          tempvalue=12; } 
        if (hexString == 'D'){
          tempvalue=13; } 
        if (hexString == 'E'){
        tempvalue=14; }
        if (hexString == 'F'){
          tempvalue=15; } 
        
        if (x==1){
        decValue=tempvalue *16;
      } else {
          decValue=tempvalue + decValue;
        }
    }

return decValue;
}

I’m not sure this is the best way but it’s working :grin:
good luck