UV Exposure Unit with built in PIC-based timer
The idea of using Ultraviolet LEDs to expose photo-sensitive circuit board is not a new one but with this design I hope to provide a solution with consistent timed exposure using very simple circuit construction, downward exposure and using off-the-peg boxes to house the unit. In fact, everything has been designed with the home constructor in mind.
The idea of using Ultraviolet LEDs to expose photo-sensitive circuit board is not a new one but with this design I hope to provide a solution with consistent timed exposure using very simple circuit construction, downward exposure and using off-the-peg boxes to house the unit. In fact, everything has been designed with the home constructor in mind. The basic system consists of two circuit boards; the UV exposure circuit and the microcontroller timer circuit. The UV exposure board has 54 UV LEDs arranged in an offset matrix and the control Board is a simple PIC controller intended for mounting above the UV exposure board. It is programmed as an adjustable timer with a triple seven segment display, two timed outputs; one for single-sided PCB exposure and another for anyone wanting to extend the unit to include double-sided PCBs. Also, a sounder output is included to indicate when the selected exposure period is over: usually about 2.5 minutes.
Please see 'Other Files' below for a more detailed description of the project including images and descriptions displayed 'in context'.
November 2020: - Code file in PDF format added. Apologies for the delay which was due to the original file being deleted in error but later found in an old backup file.
November 2020: - Code file in PDF format added. Apologies for the delay which was due to the original file being deleted in error but later found in an old backup file.
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