The Flipper Zero has always felt like a digital Swiss Army knife for hardware hackers – part toy, part toolkit, and a whole lot of trouble for the devices around it. Out of the box, it could spoof RFID badges, copy remotes, analyze sub-GHz signals, and poke into wireless protocols with the ease of a gadget built by a Bond villain’s favorite engineer. But where it really opened up was at the top, with those GPIO pins that transformed it from a multi-tool into a platform.
Enter Michael Baisch’s UV Meter module. It’s a thumbnail-sized add-on that plugs directly into the Flipper’s GPIO header and does one thing extremely well: it measures ultraviolet radiation. UVA, UVB, and even UVC rays most of us can’t see, don’t think about, but probably should. It’s like giving your Flipper Zero sunscreen awareness, which feels oddly poetic for a device usually associated with penetration testing and hacking.
Designer: Michael Baisch
The core of the module is the AS7331 sensor, a surprisingly sophisticated little chip that Baisch had to wrestle into submission. Reading UV data isn’t just about pulling values from registers. The AS7331 speaks in wavelengths and photodiode voltages, not clean numerical outputs. So Baisch wrote his own library to interface with it via I²C, making the sensor’s data digestible for the Flipper’s tiny 128×64 pixel screen.
What you get is live UV index readings broken into the A, B, and C spectrums. UVA is the long-wave stuff that penetrates deep into skin, causing wrinkles and damage over time. UVB is what gives you sunburns. UVC is mostly filtered by the atmosphere, but if you’re anywhere near artificial UV sources like sterilization lamps, knowing it’s there matters.
And the module doesn’t just spit out raw numbers. Baisch paid attention to the UX, cramming a clean, usable interface into the Flipper’s minimal display. There’s even a wiring guide built into the app for DIYers who’d rather solder their own sensor than buy the full PCB. But for the rest of us, he’s made the hardware files public, so you can 3D print, fab, or Tindie your way into having a plug-and-play UV monitor on your Flipper.
Sure, it’s not as headline-grabbing as cloning key fobs or brute-forcing infrared signals, but it taps into something arguably more relevant. UV exposure is tied to everything from cancer risk to sleep patterns. Being able to measure it on a whim (especially using a tool originally designed for digital mischief) is a compelling narrative shift.
It’s another reminder that the Flipper Zero is an absolute hardware chameleon capable of so much more than we know. With every new module, it finds fresh territory to explore. Today it’s the sun. Tomorrow? Who knows. Maybe something in the air, the soil, the human body.
