Free PDF

The Microcontroller Cheat Sheet

The things everyone keeps looking up, on one printable page. Pin it above your bench.

3.3 V vs 5 V logic — what can talk to what, and how to level-shift safely
Pin rules for ESP32, Pico and Arduino: strapping pins, input-only pins, ADC quirks
I2C, SPI and UART at a glance: wiring, speeds and default pins
Common resistor, LED and pull-up values you'll reach for every day
A quick-pick table: which board for Wi-Fi, battery, speed, tiny size or 5 V

PDF · 2 PAGES

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The Microcontroller Cheat Sheet

Logic levels, pins to avoid, I2C / SPI / UART basics and a quick-pick table of the best boards — on one printable PDF. Enter your email and it's yours.

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