České fórum pro všechny nadšence do Arduina a dalších technologií.
https://forum.hwkitchen.cz/
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myString = String(a)+String(b)+String(c)+String(d);
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myString = myString+String(a)+String(b)+String(c)+String(d);
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void decTo2char(uint8_t val, char *c) { // Convert normal decimal number 00..99 to two char
c[0]= '0'+val/10;
c[1]= '0'+val%10;
}
void bcdTo2char(uint8_t val, char *c) { // Convert binary coded decimal number 00..99 to two char
c[0]= '0'+((val>>4)&0x0F);
c[1]= '0'+(val&0x0F);
}
...
// request seven bytes of data from DS3231 starting from register 00h
tmp = Wire.read();
bcdTo2char(tmp,&textTime[6]);
second = bcdToDec(tmp);
tmp = Wire.read();
bcdTo2char(tmp,&textTime[3]);
minute = bcdToDec(tmp);
tmp = Wire.read();
bcdTo2char(tmp,&textTime[0]);
hour = bcdToDec(tmp); // 40+ hours = 12 hour time = something is bad anyway
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static char buf[4];
snprintf(buf,4,"%d",i);