Sunrise alarm clock uses DCF77 for perfect time

sunrise-alarm-clock-dcf77

Here’s a sunrise alarm clock that keeps perfect time. It was designed and built by [Renaud Schleck] who also published a post detailing the process.

As you can see, a series of white LEDs inside of the transparent case which provide the simulated sunrise. As the days get short and the nights longer we do see the benefit of having your clock brighten the room before it jolts you out of your slumber. Speaking of, that alarm sound seems to be the weak link in his design. He’s using a square wave smoothed with capacitors to drive a speaker at either end of the case. We didn’t hear an example but we imagine this not the most gentle of sounds.

The rest of the design is quite well done. He’s using a 4×20 Character LCD display and adjusts the backlight using PWM. A DCF77 radio feeds data from an atomic clock signal to the MSP430 chip which runs the clock. There’s even a battery backup in case the power goes out.

We just saw a project yesterday that aims to improve signal quality with a DCF77 radio.

[via Reddit]

Cheap USB LCD

Part of the pre-Vista hype was the idea of auxiliary displays. Laptop and desktop displays would provide additional information from your computer. The Vista SideShow feature hasn’t really caught on and the surplus hardware has started to drop in price. Take this PicoLCD for example: It’s a 4×20 character LCD with an IR receiver, multiple buttons, and a USB connection. The best part is: it has Linux drivers and an open source SDK. We know  a lot of you like wiring up HD44780 based screens, but it’s hard to pass up a $50 prepackaged solution with such nice extras.

[via Engadget]

Follow

Get every new post delivered to your Inbox.

Join 92,194 other followers