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A "Logic Probe - Next Generation"
An older article, but a good idea... Logic probe on steroids.
This is the logic probe built with an odl 16F84 (I bet you've some spare) with some advanced functions (from its web page):
Serial code receiver - The serial code receiver receives 42 bytes and displays them in both HEX and ASCII. The baud rate is selectale in 8 steps from 1200 to 115200. Signal polarity can be chosen to fit either a TTL signal or an RS-232 signal.
Logic state analyzer - A one-channel logic state analyzer. It fetches 300 single bit samples in a selectable rate from 25ms to 1µS (40 Hz to 1 MHz in 16 steps). The sampling is trigged at at a selectable edge (high-to-low or low-to-high). The digital waveforms are displayed in a pseudographic mode on the LCD.
Frequency counter - The frequency counter displays the frequency with up to 8 digits on the LCD. The refresh rate is 500ms. There are four ranges, from 5 MHz to 40 MHz, which affect the count resolution (from 4 to 32).
Logic probe - The low and high logic levels are displayed by LEDs which are OFF if the probe tip is floating.
Read more on homepage: The Engineer's Assistant