Pinouts - adafruit learning system ItsyBitsy 32u4 Manual

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Pinouts

The ItsyBitsy 32u4's come in two flavors - 5V and 3V.
The pinouts for these are very similar except for the power pins which have different voltages!
© Adafruit Industries
https://learn.adafruit.com/introducting-itsy-bitsy-32u4
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