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.
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.