#8 Simple Demo of Binary Coded Decimal (BCD) for Real Time Clocks (such as the DS3231 and DS1307)
A very quick explanation of Binary Coded Decimal (BCD) as used in the Real Time Clock modules DS3231 and DS1307 often used in Arduino projects.
Also a 60-second trick to convert any decimal number to binary.
You don't have to know this to work with those clock modules but it can help you understand what's going on in some of the C++ code.
It's painless and easy once you understand the concept.
And my channel is here:
/ ralphbacon
How can I remember this? Memory tip: "See" Ralph Bacon, geddit?