To get constant moisture level, I've put together an USB powered whatstone bridge with uA-meter as display. Moisture is measured with two wires and an npn transistor. Other side of bridge is a trimpot for 0adj. 40uA makes my green lily happy.
same principle as "LED torchiere", but built low-cost with steel cable spanned across the room, crocodile clips, massive copper wire. Approx. 3 Watt per square meter for a daytime-like light impression plus super low electricity bill.
most of my electronics stuff happening here. power supplies, isolation transformer, signal generators, multimeters, scopes, microscope for smd work,... there is an additional storage room with shelves/boxes for projects and less used parts
poor litte air compressor fell off a forklift... new motor, belt and pulley, motor control (all smashed), oil exchange, built mechanical motor adapter, belt protection cage, sandblasting cabin...
never ending story ;) Lots of (sheet) metal work to be done, starter does not work yet...
volume intersection stuff based on point cloulds (re)constructed from reverse projected light path from webcam images. C++. high school project info/math.
Had to interface my two UT61E with my Linux box but no SW was available/working due to kernel usb stack changes. in the meantime there should be a kernel module for that usb-rs232 converter.
no documentation was available
control board was completely broken (no protection fuse + short circuit...), most switch contacts bad/highZ, no documentation was available (=reverse engineered the whole thing)
1. Take voltage of r,g,b VGA channels
2. voltage-to-current opamp circuit
3. drive led stip
laptop power supply, led modules (step-down current regulated), CNC wood mounting bracket
based on aluminium Rimowa Service Suitcase from 1980s/1990s including: mobile phone charger, battery charger, flatbed scanner, card reader, 2nd ethernet port, tons of usb ports, dj gooseneck lamp, bluetooth, gps, mains or car powered, ...