Build a cheap and simple full software controlled step-up (boost) converter to drive a LED string of 10 LEDs. LEDs are used as string to light up a acrylic engraved plate placed in a holder (also made out 5 layers of lasered black acrylic glas). Step up is from 5V to about 30V, current regulated to about 20mA.
[[Datei:PlexiglasStand.jpg|640px400px]][[Datei:Led stepup1.jpg|400px]] [http://youtu.be/oMV0tqm9Ufk See video]
== Circuit ==
[[Datei:LedStepUpCircuit.jpg|640px]]
== Download == All source files, schematic, Arduino code, LTSpice simulation files etc. included here: [[DateiMedia:LEDStepUpSoftware-Konstantstromquelle_web.zipsvg]]
Passendes Fritzing-Projekt von Cheasy: [[Media:LEDStepUp.fzz.zip]]
http== Software ==The software is just a small Arduino file, it needs the ATtin85 hardware lib from [https://youtugithub.becom/oMV0tqm9Ufkdamellis/attiny/archive/master.zip here] to run on an ATtiny85. PWM is operated at 100kHz and duty cycle is adjusted adaptive in function 'regulate' according the desired brightness and the current measured. Main loop does set the brightness according first half of trimmer setting or does brightness up and down for second half of trimmer setting for a little effect. == Download == All source files, schematic, Arduino code, LTSpice simulation files etc. included here: [[Datei:LEDStepUp.zip]]
