The goal was to build a chamber to test the durability of wooden parts under UV radiation.
The cabinet contains six UV radiation lamps. The upper part contains all the electronics, control elements and fans.
There is one ballast for every two UV lamps. UV lamps operate on 230V alternating current (AC). The second 5V power supply is for the controller. It has a solid-state relay that turns the UV lights on/off using a microcontroller. I use Raspberry Pi Pico 2 W. The plan is to add a web interface in the future. It has a DHT22 temperature and humidity sensor. It is inside the UV chamber. Also, it has a control circuit for the fans (5V). I also added door sensors to automatically turn off the UV light when someone opens the doors.
First finished prototype. Made by TSENTER. The material is MDF, painted white. The front panel (and other details) are printed in green.
Control panel.
Wiring and electronics of the first prototype.
UV lamps in the cabinet.
For the prototype, I used a PCB that was left over from a previous project. At the same time, I started to design a new PCB for this project. I contain most of the external components that I need for this board. Like a fans control circuit, LED drivers and buttons pull up resistors. All outputs are screw terminals. It is a plain green colour that matches the overall design of the cabinet. The PCB is made and assembled by PCBWay. As always, good quality. It is a simple two-layer board, but it makes it easier to connect different parts.
Tauno Erik 