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I was planning to make a super simple logic probe but Jon beat me to it with his comparator based logic probe. So I've prototyped a microcontroller based one.   Microcontroller based logic probe with display My project has just two modules, an Arduino clone and an Adafruit I2C LED backpack. The probe is connected to an analogue pin although the current software uses it as a digital pin only. The pin is sampled once every half second and 8 samples are shown across the screen on the first 2 l ...