# InsoLED ## Overview In a few words, it's a LED-based PCB exposure box. Most designs of PCB exposure boxes are based around UV-tubes, or a lot of 5mm UV leds. I chose to try with 1W UV-LEDs. The design aims to be: * Portable * Not fragile, like UV-tubes are. * Small, since I rarely need to expose an A4-sized PCB. * Big enough for standard sizes of PCB, I chose to go with 100x160mm which is already more than what I'm used to. * Easy to use * Autonomous: Put your PCB in, start, come back when it's done * Adjustable, since different PCB, traces sizes, ... require different exposure parameters. * Easy to make * Don't reinvent the wheel, at least at first... I chose to go with a cheap LED driver from eBay instead of building one. * Use cheap, easy to source, generic parts... * Use common, on-hand tools and materials * Expandable: Need a bigger one? Just add some LEDs and make a bigger case. * Safe: Yeah, this one too... Enclose the UV stuff. ## Pictures {{:avr:t44:dsc_0178.jpg?direct&150}} {{:avr:t44:dsc_0180.jpg?direct&150}} {{:avr:t44:dsc_0181.jpg?direct&150}} {{:avr:t44:dsc_0183.jpg?direct&150}} * The first one is the first prototype, on a breadboard, with a Teensy2.0 instead of an Attiny44 * The next two are the actual prototype (there was a mistake on the PCB, involving a quick fix to get the backlight) * The last one is the Power Interface to drive the LEDs, it's a phototransistor (4n35), followed by a N-Channel Power MOSFET. And yes, this is ... messy, but it works as expected, so I might integrate it in the next revision of the PCB The PCB of the Timer was made on the prototype of the exposure box ^^ {{:avr:t44:dsc_0201.jpg?direct&200|}} {{:avr:t44:dsc_0202.jpg?direct&200|}} ## PCB ### Version 1 {{:avr:t44:insoledv1.jpg?direct&300|}} I haven't built this one... ### Version 2 {{:avr:t44:insoledv2.jpg?direct&300|}} There's a small mistake the LCD Backlight must go to GND and not to Vcc... ### Version 3 Version 3 has moved to SMD parts (opto-transistor, Attiny44 and resistors). The MOSFET is now integrated on the PCB... {{:avr:t44:insoledv3fixed.jpg?direct&300|}} ## Case {{:avr:t44:revalpha.png?direct&200 }} The case is made of PVC (and PMMA for the bottom I think) cut on a small CNC. I first made a design on Catia V5, to see where to place the LEDs and stuff, and then redesigned the parts on Galaad, which was a good training exercise. The top is still to be defined, but I think it'll be in two parts, one to hold/hide the electronics, the other, on hinges, to hold the LEDs and allow access to the PCB that's being exposed. ## SVN Repository Right now, that's the only resource available. The whole project is under GPLv3, so feel free to improve it. svn co http://svn.redox.ws/svn/InsoLED . ## Bugs, improvements I've set up a Tracker for bug reports, suggestions, ... __[[http://bug.redox.ws/proj3|Here]]__