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Published on Dec 18, 2013
This small room automation project has been rigged with an easter-egg for the Hackaday Fubarino contest.
When the 5th channel (100V, 1A, MOSFET) is PWM'ed at a duty cycle of exactly 50%, the easter egg is revealed by fast blinking of the lights on channel 1 (260V, 10A, relay). Channel 1 isn't a random one, my mini Christmas tree is on channel 1. So this easter-egg has a Christmas theme. The blinking is actually a link to hackaday.com, endoded in morse code.
The ATMEGA8, which is the controller for this project, is controlled via a Bleutooth app on my phone. In the video, you might spot the Arduino Mega, but it is not used other than for it's 3.3V regulator for the Bluetooth module on the ATMEGA8. It has 4 channels on which a relay (260V, 10A) is driven by a way to big MOSFET (I did this project with stuff I had on my room). There is a 5th channel, which is 100V DC, 1A rated. This channel is directly controlled via a MOSFET. It's a piece of cake to add more channels, if neccesary. I've ordered a motion sensor, which came in just now, which will be coupled to an LDR to make sort of like a motion sensor coupled to all of the lights in my room. I know the video isn't really sharp or anything, but this is the first video I made of one of my projects. I tried to tap the Christmas tree button on my phone as many times as possible, to show it is not rigged in anyway. The only way to get the Morse code blinking is by setting the duty cycle to exactly 50%.
Tell me what you think about it, I'm open to suggestions. I'm going to upload the PCB file for the 4ch relay, nothing spectacular. Code is really simple, but I'll place a link to it as well.