For unknown reasons the library converts uppercase 'C' to lowercase 'c' if you use setChar. You may want to use uppercase one, most likely for temperature display but not only for that. As library seems to be unmaintained now I'm publishing a workaround in "Issues".
In that case, open LedControl.h and replace PROGMEM with this
const static byte charTable [] PROGMEM = { B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000, B01111111,B01111011,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B10000000,B00000001,B10000000,B00000000, B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000, B01111111,B01111011,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B01110111,B00011111,B01001110,B00111101,B01001111,B01000111,B00000000, B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00000000,B00000000, B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00001000, B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B00000000, B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00010101,B00011101, B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000 };
You can modify this array to make library show other characters if you wish, binary data is as following:
1st bit - Decimal point
rest of bits - binary segment data representation on standard 7 seg display. Look in the internet for scheme
For unknown reasons the library converts uppercase 'C' to lowercase 'c' if you use setChar. You may want to use uppercase one, most likely for temperature display but not only for that. As library seems to be unmaintained now I'm publishing a workaround in "Issues".
In that case, open LedControl.h and replace PROGMEM with this
const static byte charTable [] PROGMEM = { B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000, B01111111,B01111011,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B10000000,B00000001,B10000000,B00000000, B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000, B01111111,B01111011,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B01110111,B00011111,B01001110,B00111101,B01001111,B01000111,B00000000, B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00000000,B00000000, B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00001000, B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B00000000, B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00010101,B00011101, B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000, B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000 };You can modify this array to make library show other characters if you wish, binary data is as following:
1st bit - Decimal point rest of bits - binary segment data representation on standard 7 seg display. Look in the internet for scheme
Regards, Daniel