# Adafruit Qt Py
- https://github.com/adafruit/Adafruit-QT-Py-PCB
- https://github.com/adafruit/Adafruit_CAD_Parts/tree/main/4600%20QT%20Py

# SAMD21
- https://cdn-learn.adafruit.com/assets/assets/000/044/363/original/samd21.pdf

# GD25Q16
- 2MB SPI Flash in 8-Pin SOIC package
- https://cdn-shop.adafruit.com/product-files/4763/4763_GD25Q16CTIGR.pdf