I have noticed some interesting discussions on this forum about the need for a “real time clock” bit.
Maybe someone on this forum could pick up the challenge to develop this interesting bit…
I would like to share my first thoughts about this subject with you.
Maybe the following design could work:
. Set year, month, day, hours, minutes, seconds, alarm and time zone with the set and up/down buttons.
. A maximum number of 10 alarms can be set (indicated by the alarm display).
. An alarm sets the SIG line on a 5 Volt level to activate the other connected bits.
. The timer can also be set on “chrono” to use a preset time setting. Then the clock counts down from the preset time to zero and initiates an alarm.
. Maybe an additional bitsnap could be connected to send the real time digital signals to an Arduino so with a little sketch this information could be used further in a project.
I own an alarm clock, automatically adjusted by the time signals from a low frequency radio station.
I saw your nice radio bit in the bitlab, could it be possible to integrate a radio chip, listening to such a LF (Low Freqency) radio station?
“In the United States, the signals received by radio controlled clocks originate from NIST Radio Station WWVB, which is located near Fort Collins, Colorado. WWVB broadcasts on a frequency of 60 kHz. A radio controlled clock actually has a miniature radio receiver inside, which is permanently tuned to receive the 60 kHz signal”.
See this link:
If this would not work, an oscillator controlled timer could be used, but this version would definetly be less accurate…