UV-Exposure box V2

The previous version of my exposure box didn't work good enough for my purposes, so I made a new one in the enclosure of an hp scanner. I also made a chronometer to help me time the exposure, the chronometer switches the lamps with a relays.

 

Pictures:.

 

The circuit:

 

The program (picbasic):

Device 16F627
Config   WDT_OFF, PWRTE_ON, LVP_OFF, MCLRE_ON, INTRC_OSC_NOCLKOUT
Declare         LCD_INTERFACE 4
Declare         LCD_LINES 2
Symbol Lampen = PORTA.2

Symbol Start =  PORTB.0
Dim hondert As Byte
Dim seconden As Byte
Dim minuten As Byte
hondert     = 0
seconden    = 0
minuten     = 0
Cls
DelayMS 500

Print At 1,1, "C Elek"

Print At 2,1, "Stynus"
DelayMS 1000
Print At 1,1, "      "
Print At 2,1, "      "
Print At 2,1, "0 :0 :00"

GoTo Begin
Begin:
Print At 1,1, "OFF"
If Start = 1 Then
    bla:
    DelayMS 50
    If Start = 1 Then
        GoTo bla
    End If
    If Start = 0 Then
        High Lampen
        GoTo Loop:
    End If
End If
GoTo Begin

Loop:

Print At 1,1, "ON "
Loop2:

If Start = 1 Then
         DelayMS 50
    bla2:
    If Start = 1 Then
        GoTo bla2
    End If
    If Start = 0 Then
        Low Lampen
            hondert     = 0
            seconden    = 0
            minuten     = 0         
        GoTo Begin
   End If
End If

'tijd op Lcd:
DelayMS 3.98
hondert = hondert + 1
If hondert = 100 Then
    hondert = 0
    seconden = seconden + 1
End If
If seconden = 60 Then
    seconden = 0
    minuten = minuten + 1
End If
Print At 2,1,"  :  :"
Print At 2,1,@minuten

Print At 2,4,@seconden
Print At 2,7,@hondert
GoTo Loop2   
End

 

The HEX-file: Download.

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Update 27/03/08

I got the question how I could do a double sided pcb with my single sided exposure box. Well, the trick is to use a L shape piece of PCB. You can drill some guide holes in it, but it is not necessary.

I tape the sheets to the pcb, so you get a "bag" where the pcb can slide in.

For the exposure you have to remove the foil on both sides off the pcb. During the exposure you can place a black piece of paper on top against reflecting light.

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Update 24/10/2011

I updated this old exposure box by fitting it with my new timer.

Connection circuit:

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Available Products:

Timer build kit	Timer PCB	UV PCB Exposure timer soldering + testing	IC16F628A UV PCB Exposure timer

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