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Logic Probe With Pulse Dete...View Instructable »
Yes you are right. Both LEDs will be illumination in the middle voltages.But this is only the case if you do not use a 3.3V zener diode. The NTE519 is no zener diode (See https://en.wikipedia.org/wiki/Zener_diode). A ZF3.3, BZX79-C3V3, 1N5226B or 1N4728A will work fine.With a 3.3V zener diode the green LED will be off at about 0.6V. The levels of 0V to 0.6V for green = LOW level and the 2.2 V to 5V for red = HIGH agree well with the levels for TTL.By the way, I put my LogicTester in a transparent shrink tube.
Hallo Cesar,the hex code is already there. Its at http://praktische-elektronik.dr-k.de/Projekte/Logi...Unfortunately the description is German.