Revision number 500... 3.5" TFT FeatherWing

for more than a year we've been slowly revising just about every product we make to account for changes in transistors, regulators, diodes, boosters...lots of churn! we're finally up to revision #500 and we're happy to finally get to a product that had to have nearly every component changed: the 3.5" TFT FeatherWing (https://www.adafruit.com/product/3651), the touch driver went from STMPE811 to TSC2007 (https://www.digikey.com/short/v2mf43q9), the screen supplier changed, the boost converter went from FAN5331 to TPS61169 (https://www.digikey.com/short/4zf0d1n2), and we've added a QT port. This demo tests all the hardware functionality - we load a BMP from the SD card, display it on the TFT, then 'draw' on the image with the touchscreen. all is good - we're ready to order the final PCBs!
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