I outfit two really old multimeters with new scales to display system stats (CPU/MEM/NET). They will be interfaced by some AVR which talks to the computer via software USB.
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README
scale-cpu-mem-plain.svg
scale-cpu-mem.svg

README

Vintage multimeters used as system monitors to display cpu load etc.

The hardware is a pretty straightforward ATMega8 with some low-pass filters on its
two 16-bit-PWM-outputs and the usual software-USB-stuff (resistors, connector,
12MHz crystal).