PCB Exposure Unit

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About: Passion for making.

I made this to replace my old exposure unit. This one got internal timer and real UV leds. Main material is 20mm MDF. Electronics are controlled with arduino nano. Even if you are not interested making own PCB's or stuff like that, you may find usefulI tips when working with MDF. Entire making of process is documented in video below.

Step 1: Making of Exposure Unit

Any comments and questions are welcome :)
https://youtu.be/wRdey0U7HZM

Step 2: Technical Info

Schematic is a mess but basically I made simply expansion shield for arduino nano where you plug all the wires, pullup/down resistors, buzzer, terminals, FET etc... That external 5v regulator is not needed if you use arduino's build in regulator.

Glass panel inside unit is from old scanner. That determines my box size.

R1 and R7 are 10k pulldown resistors.
R4 and R6 are ~ 200ohm current limiting resistors for led and lcd backlight.

Both trimmers are ~5k. I think you can use any other values too. LCD brightness and voltage to FET gate are controlled with them.

Caps are for smoothing purpose for regulator LM7805.

C2 1uf-10uf
C1 0.1uf

FET IRLZ44N or similar logic level fet. This one is bit over kill but i had it laying a round.

To potpin I attached multiturn 5k pot. If you are using my code I recommend using multiturn pot because accuracy is much better compared to normal pot.

PAD1 and PAD4 are meant to be connected via jumper wire.

PAD2 and PAD3 are meant to be connected via jumper wire.

Piezo is 5V Continuous Sound Piezo Buzzer. I Dont know exact part number. Bought from ebay.

Step 3: Files

Eagle files, google sketchup file and arduino code.

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    36 Discussions

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    VogEdo

    Question 8 weeks ago

    Hi,
    Thank you very much for this wonderful project.
    I would like to reproduce it but i don't know how sketchup works.
    Did you saved the mdf components in other formats (blender, dxf, ecc...)?
    Of course I can redraw every single mechanical parts but it will be a very expending time step.
    Thank for your help.

    Edoardo

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    icelicenice

    3 months ago

    can you please tell me the pin connections of the components i can't barely understand the schematics it will be an aid for me thanks in advance

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    AntonS83

    Question 5 months ago

    Very neat project. I see in your schematic you have 4 pins for the panel LED. Are pins 1, 2 and 3 for 3 seperate LED anodes which have one common cathode on pin 4 ?

    2 answers
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    fortzeroAntonS83

    Answer 5 months ago

    Yes they are. I used an RGB led in this project which have 4 pins.

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    AntonS83fortzero

    Reply 5 months ago

    Fantastic, thanks for the great project. The pinouts now make sense. I will get one of those LEDs.

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    pcbwiz

    1 year ago

    Thanks for sharing. What did you use for your LCD?

    1 reply
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    tgirard

    Question 7 months ago

    I want to do this project but I can't find a uv LED panel for a reasonable price. If you could please post where you got yours that would be great

    1 answer
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    KirkB1tgirard

    Answer 6 months ago

    My suggestion would be to go to Ebay and buy a UV LED strip and cut it up into appropriate lengths (on the CUT spots) and then wire it together. I did this and it works well.

    For example: www.ebay.com/itm/322710778646 I got 3M of the non-waterproof and I actually used this manually to make the PCB to make it automatic.

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    MohamedH50

    Question 10 months ago

    hi, tried to upload code to arduino nano, i got sketch uses 4398 bytes of the program storage space, maximum is 30720 bytes, how to upload please?

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    jbutron

    Question 11 months ago on Step 3

    Hi that´s and amazing work. What LCD screen do you use it??

    Regards

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    NassimI

    1 year ago

    Excellent workmanship

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    Mr.D3

    1 year ago

    Excellent workmanship.

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    AlejandraS19

    1 year ago

    This looks very well made! Would it work for exposing photopolymer plates? the ones used for letterpress print.

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    kamil47

    1 year ago

    Very professional project.

    Can you shortly describe a method to produce PCB by exposer unit. I know, it should be a photo, but which type of material do you use?

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    imrankazi

    1 year ago

    Superb make.

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    dapug

    1 year ago

    That flush panel mount status LED is way cool. Is that something custom you did? Any details?

    2 replies
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    fortzerodapug

    Reply 1 year ago

    It's a reflecting cover for 5mm leds.

    http://www.partco.fi/fi/ledit/ledikehykset/2738-led-5-heijas-k.html?search_query=led&results=365

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    DidanJ1fortzero

    Reply 1 year ago

    How to weld that 5mm leds? Do you know any shop store that ship it to Brazil?

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    DidanJ1

    1 year ago

    Hello, nice project. Do you create the schematic circuit? If no, can you send me the original schematic circuit from where do you based on to create its layout using EAGLE CAD, please? I want more information about that circuit. Thanks