PCB Exposure box with LEDs

I used the ‘shell’ of an old scanner as the housing of an PCB exposure box using UV LEDs. It has a control panel with an LCD screen and 4 buttons on the front. An AVR microcontroller controls the process.

The box with all the LEDs turned on

Through the provided settings in the menu, you can set the exposure time, which panels to enable (top, bottom or both), LCD display backlight and if you want to halt the process if the lid is open. It also has 10 slots where you can save settings for future sessions.

The box with the lid open

For power it uses any power supply with voltage over 12V. The power board gives two voltage levels: 5V voltage for control and 12V for supplying the LEDs.

I only used it to expose very few PCBs, since veroboards are usually faster for one-offs. One of those boards was the control circuit for a rotation sensor using light encoding for a university assignment. Here is a picture of the control circuit after developing.

The control circuit PCB before drilling and soldering