The goal of this project ist to construct a UV Exposure Unit reproducable in every Hackerspace with a Laser-Cutter. It is controlled by an Arduino and is designed to be as reproducable as possible. This means easily accessible parts and nothing too special.
16x2 Character LCD (16pin interface)
Needs to drive the Character LCD, controll a FET and needs to have three inputs left.
Logic Level MosFet
Directly connected to the Arduino, with internal Pull-Up
I have updated the casing to it's final state (until now). Since I haven't found any suitable hinges (easily available), the lid will be attached with fabric tape.
The PCB will get a buzzer, for audible notification, that the exposure is finished and maybe a led row in green/red in the bend-wood part of the casing, to see the state of the machine from a distance.
One problem I have encountered, while publishing the .dxf files, is an appropriate license. I want everyone to use the designs and replicate them for private or educational use, but I'd like to have control over, wether someone earns money with it. All licenses I have found so far are quite restrictive. It's mostly all or nothing. Is there a license, that gives me the possibilites I want?
The right most exposure time was 13 minutes. It still seems to be underexposed. The letters on the left have sharp edges, so the distance of the leds to the board seems to be sufficient. I'm currently using H2O2 + HCl for etching.