[Matthias] sent us this job where he develops an AVR light controller. He had a halogen bike light laying around, however was unsatisfied with its lead-acid battery. He wished to utilize a lithium-polymer battery however discovered that they can’t be utilized directly with halogen lamps because of their voltage. His created 8.5 volts at full fee as well as can’t be discharged to below 5 volts. He new a power controller would be required to try to flatten that out for his lamp, which needed to stay between 6-12 volts.

He utilized an ATtiny45 doing PWM to modification the voltage. Some other awesome features he added were the high as well as low settings as well as an LED condition light for warnings. You can discover pictures, schematics as well as source code on his page in addition to tons of fantastic information. fantastic task [Matthias].