u/Grubbauer

Hello

I’m building a UV exposure box and would appreciate a quick review of the attached schematic.

The user selects the exposure duration with a potentiometer and locks the selection with a pushbutton. A low‑side switch then powers the LED strip for the programmed period, with a piezo providing audible feedback and an I²C display showing status or time remaining.

I have very limited spare parts and can’t risk damaging components through trial and error, so please highlight any errors or high‑risk items to check before I power the circuit.

Thank you for your time.

Hey there,

so I am trying to control an LED light strip (12V) with an MOSFET. The problem is, as soon as the MOSFET is triggered, not 12V but 8.6V are flowing through the LED strip, even though I do not see the Problem. I have linked all the used components.

Thanks in advance!

Hi there,

so I am trying to make DIY-Exposure box with UV light. I am using a 12V UV-LED-Strip and an N-type MOSFET. I want to later expand this project so it can be controlled via STM32/Arduino Platform. But I have run into an issue, when I try to power the LED Strip, it just doesn't quite light up, it is very, and I mean extremely dim, and when trying to power it with an 9V battery source (which would make the LED Strip dim, but still visible that there's current flowing through), it doesn't light up at all.

Even running it through a Simulator it returns that the voltage across the LED Strip is 8,xV. I have no idea what I am doing wrong, I tried many things but the circuit still doesn't live up to its expected function.

Thanks in advance!