WS2812B 7 segment display

7-Segment frame and transparant segments. Size 27 x 47 mm. WS2812B LED display behind the segments needs only one control wire for 28 segments.
Arduino : Segment arranged a-g clockwise. Adafruit library.
byte tab[]={0x3f,0x06,0b1011011,0b1001111,0b1100110,0b1101101,0b1111101,0x07,0x7f,0b1101111}; //shapes

void num( byte n, byte p, unsigned long c) { // digit n, position p, color c
byte m=1; n= tab[n];
for(byte i=0; i