Black Pill logic probe with OLED and protocol sniff snippets
A pen-shaped STM32F4 probe that shows logic level, frequency and a short UART/I2C decode on a tiny OLED.
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How It Could Work
STM32F401/F411 Black Pill in a 3D-printed pen body with a needle tip (series resistor), 0.96in OLED and two buttons. Firmware samples input, estimates frequency/duty, and best-effort decodes recent UART/I2C bytes. USB CDC dumps a longer buffer. Pairs with EMBO/pillScope in the catalog.
Estimated Specs
DifficultyIntermediate
CostUnder $15
BoardSTM32
ChipSTM32F4
Suggested Parts
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