Updated guide: Capture JPEGs with @Adafruit @CircuitPython

Jeff Epler demonstrates the recently added JPEG capture mode available with CircuitPython and OV2640 camera modules:

The OV2640 camera module can also capture JPEG images up to 2 megapixels (1600×1200 pixels). This still requires a large buffer (of width×height÷5 bytes, or 384,000 bytes for a 2-megapixel image), so the demo below is coded for the Kaluga development board together with the MicroSD card breakout board+.

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