A hot and cold candle, the Rosoku

Ok, so Rosoku (that should be written "rousoku" or even better 蝋燭　ろうそく) means candle in japanese. I stumbled upon that project today (2012/02/08) and found it quite interresting, like the kind of thing you can do on a big evening or a sunday afternoon, to change your mind of other long run projects. Also looks perfect to finally play with thoses Attiny13 I bought the other day, I have at least one spare LM35 for the temperature, a few RGB leds, some button battery ... hum...
It is also my first project using AVR Studio 5, which is a great tool but missing a little something...

The source of the idea :

• http://www.mermardesigns.com/temp_candle.htm

Other links:

• A very nice candle, with the smart idea of "record mode" to sample a real candle and replay... http://petemills.blogspot.com/2012/02/attiny-candle.html

Points of interrest and technical notes

3 PWM when you have 2 PWM

I unfortunately notice that my dear Attiny13 has only 2 PWM pin, not 3 ! How can I drive my RGB led with that since I don't want to use an external IC? Just PWM it yourself.
　⇒　HOWTO do PWM with Attiny13 the soft way .