BBC2 年
The 12 and 24 hour clock
For any time before 10 o'clock in the morning, a zero is placed at the beginning. The first two digits show the hour and the last two digits show the minutes. We don't use AM or PM here ...
BBC2 年
The 12 and 24 hour clock
For any time before 10 o'clock in the morning, a zero is placed at the beginning. The first two digits show the hour and the last two digits show the minutes. We don't use AM or PM here ...
Hackaday9 年
Light Duty Timekeeping: Arduino Berlin Clock
This replica uses LEDs driven by an Arduino Nano and a real-time clock. Since the RTC gives hours from 0-23 and minutes and seconds from 0-59, a couple of shift registers and some modulo ...
BBC5 年
Doomsday Clock frozen at two minutes to apocalypse
When it debuted the clock's hand stood at seven minutes to midnight and it has been reset 23 times since. According to the Bulletin, its design was conceived by artist Martyl Langsdorf.