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May 10, 2019
red = +5V
black = GND
green = TX, 3.3V TTL level (connect to RX on MCU side)
blue = RX, 3.3V TTL level (connect to TX on MCU side)
cable assignment: - red = +5V - black = GND - green = TX, 3.3V TTL level (connect to RX on MCU side) - blue = RX, 3.3V TTL level (connect to TX on MCU side)
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