Overclocking an Arduino Zero (or any ATSAMD21 board)

Introduction The Arduino Zero made quite popular the ATSAMD21 microcontroller, which was later adopter by a number of other compatible boards like Adafruit’s Feather M0 or Itaca-Innovation’s uChip. The SAMD21 is a 48-MHz Cortex M0+, with hardware multiplier, a nice… (READ MORE)

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How to interface a 5V output to a 3.3V input.

Many times we must interface 5V to 3.3V devices. This occurs very frequently on Arduino, but other applications need 5V to 3.3V ICs or systems to communicate. For instance, imagine you want to connect to your Arduino Uno, which works… (READ MORE)