From 94743f767cc715cc3e90a4728dfbb1e60b339c14 Mon Sep 17 00:00:00 2001 From: Mark van Renswoude Date: Sat, 10 Nov 2018 12:56:29 +0100 Subject: [PATCH] Updated bom (markdown) --- electronics/bom.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/electronics/bom.md b/electronics/bom.md index 0c51374..daea809 100644 --- a/electronics/bom.md +++ b/electronics/bom.md @@ -20,6 +20,13 @@ Many people use a laser printer, but the ones I had did not deposit enough toner The printer I use is a Canon PIXMA iP7250, which is not all that expensive. For any Canon use the official "PGI" range or cartridges, as these are pigment based. With these I do not need to double up on transparencies to get great results. +## UV light source +I started out with a UV nail polish dryer which was ok, but the timer function could only do 120 seconds. Instead I built a little UV exposure box using an array of 5mm UV LEDs, 12 x 12 spaced about 1 cm apart. These are controlled through a MOSFET by an ATMega328, hooked up to a 16x2 character LCD and a rotary encoder. The time can be set, as well as the intensity (using PWM). I may one day post the code, schematics and 3D printable enclosure. + +UV LED strips will probably make for an easier build, and you can replace the bare ATMega328 with an Arduino just as easily, but I liked the challenge. The LEDs have turned out to be very effective, reducing the exposure time significantly. + +Whatever you use make sure you have enough control over the light source so that you can experiment and get good repeatable results. + # Consumables ## Transparencies