PCB Exposure Unit

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Introduction: PCB Exposure Unit

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.

Make a Box Contest

Participated in the
Make a Box Contest

Full Spectrum Laser Contest 2016

Participated in the
Full Spectrum Laser Contest 2016

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    40 Discussions

    0
    Jorge Alfredo Laguna
    Jorge Alfredo Laguna

    Question 8 months ago on Introduction

    Hola buenas noche no puedo descargar el archivo pdf me interesa para realizar una esa máquina desde ya muchas gracias

    0
    Jean-Marie MEILLIER

    Pardon. Je parle pas anglais ...
    Très belle réalisation. Félicitations.
    How to see différence entre schéma électrique et schéma de circuit imprimé : sur le schéma électrique les broches 14 et 15 de JP1 (Arduino Nano) vont à l'afficheur et sur le circuit imprimé elles donnent accès à PAD1 et PAD2.
    PAD1 PAD2 PAD3 PAD4 est censé être connecté au connecteur SWITCH PIN 1 2 3 4 avec les résistances R1 et R7.
    Est-ce que je me trompe?
    Je n'ai pas su déterminer avec le croquis quel schéma était bon et lequel était mauvais.
    Je serais déçu de ne pas arriver au bout de cette réalisation.
    Merci pour ce que vous ferez pour moi (même en anglais).
    Jean-Marie

    1
    dapug
    dapug

    3 years ago

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

    1
    fortzero
    fortzero

    Reply 3 years 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

    0
    DidanJ1
    DidanJ1

    Reply 3 years ago

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

    0
    EvandroC5
    EvandroC5

    Reply 1 year ago

    DidanJ1 Aqui no Brasil pesquize por suporte para led. Encontra em qualquer casa de componentes eletrônicos.

    0
    Thomss
    Thomss

    1 year ago

    I love it, as well the construction as the idea.
    Thank you so much

    0
    VogEdo
    VogEdo

    Question 1 year 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

    0
    icelicenice
    icelicenice

    1 year 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

    2
    AntonS83
    AntonS83

    Question 1 year 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
    fortzero
    fortzero

    Answer 1 year ago

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

    0
    AntonS83
    AntonS83

    Reply 1 year ago

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

    0
    pcbwiz
    pcbwiz

    3 years ago

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

    0
    tgirard
    tgirard

    Question 2 years 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

    0
    KirkB1
    KirkB1

    Answer 2 years 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.

    0
    MohamedH50
    MohamedH50

    Question 2 years 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?

    0
    jbutron
    jbutron

    Question 2 years ago on Step 3

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

    Regards

    0
    NassimI
    NassimI

    2 years ago

    Excellent workmanship

    0
    Mr.D3
    Mr.D3

    2 years ago

    Excellent workmanship.