posted Jan 30th 2009 1:29pm by Caleb Kraft
filed under: daily, tool hacks
halogen
[Matthias] sent us this project where he builds an AVR light controller.
He had a halogen bike light laying around, but was unsatisfied with its
lead-acid battery. He wanted to use a lithium-polymer battery but found
that they can't be used directly with halogen lamps due to their
voltage. His produced 8.5 volts at full charge and can't be discharged
to below 5 volts. He new a power controller would be necessary to try to
flatten that out for his lamp, which needed to stay between 6-12 volts.
He used an ATtiny45 doing PWM to change the voltage. Some other cool
features he added were the high and low settings and an LED status light
for warnings. You can find pictures, schematics and source code on his
page as well as tons of great information. Great job [Matthias].
Go there...
http://hackaday.com/2009/01/30/avr-light-controller/
Don
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