I had some time on my hands & just for fun, I thought I'd do a (very basic) "scope" with Crownhill's development board.
The screen updates with only the changes in the waveform so the display remains "flicker free" for anything reasonably periodic.
The "scope" is good for < ~1Khz - did I say it was basic(!)
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MAX14595: High-Speed, Open-Drain Capable Logic-Level Translator
The MAX14595 is a dual-channel, bidirectional logic-level translator designed specifically for low power consumption making