Some of the most inefficient appliances in the home are AC
mains-powered clocks. You can’t exactly turn them off and they use a
whole lot of energy considering how often they’re looked at. [t3andy]
came up with a great low power AC Mains clock that is only on 3% of the time. As a neat bonus, it also looks really, really cool.
[t3andy] is using a Teensy 3 as the brains of this clock, and the
serial interface on the board provides a relatively easy means of
setting the time without having to use buttons or tact switches. The
clock face consists of 13 neopixels,
with two red pixels showing the hour and a single green pixel showing
the minutes. The time is measured with a DS3232 I2C real time clock with
a battery backup.
The design is remarkably efficient since the LEDs are off 97% of the time, only being lit at the top of the minute. There are provisions for IR control and a PIR sensor to display the time whenever it’s needed, but that would obviously mean a hit to the energy efficiency.
The design is remarkably efficient since the LEDs are off 97% of the time, only being lit at the top of the minute. There are provisions for IR control and a PIR sensor to display the time whenever it’s needed, but that would obviously mean a hit to the energy efficiency.
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