Open hardware
Measure what your electronics actually do.
Small, well-documented boards for seeing the numbers behind a circuit — voltage, current and capacity on a USB line or a pair of screw terminals. Designed, built and documented by FriedCircuits.
Hardware
All documentation →USB Tester
Voltage and current on any USB line. Pinout, protocol, both revisions and their assembly guides.
OLED Backpack
Add a display. Assembly, firmware updates, the Java app and the Bluetooth variant.
LED Matrix
The Master and Link boards, and how to chain them.
VA Tester
Voltage and current on screw terminals, for anything that is not USB.
TinyISP Tuner
Programme an ATtiny and tune its internal oscillator.
Accessories
Acrylic bases, dual resonator kits and the smaller parts.