In winter time we get sleepy because days are short. And in order to get up early we definitely need an alarm clock. It seems that regular alarm clocks are boring these days and many of us are looking for something different. Renaud suggests to try his idea – a sunrise alarm clock. It is not something new or unusual, just a digital clock with set of LEDs that imitate sunrise light.
Clock is run by MSP430G2553 that runs on MSP430 Launchpad from TI. Precise time is updated using DCF77 radio module that synchronizes time automatically. Time is displayed on nice 4×40 alphanumeric LCD. It also has a speaker alarm in case LED lights won’t break through the eyelids. Alarm sound is generated using PWM signal filtered with low pass filter. Not the best sound but works for now. LED simulated sunrise is built using a bunch of LEDs that are driven using PWM through resistor key. It is hard to tell how close this light is to reality, but idea is plausible.