Update README.md
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@ -149,8 +149,8 @@ Pin FUNCTION
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1 VCC (3.3v constant)
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2 GND (continuity to DC negative)
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3 TX (3.3v high, fluctuating during transmission, dead when unpowered)
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4 RX (3.3v high, fluctuating during transmission, dead when unpowered)
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3 TX (3.3v high, fluctuating during transmission while device is powered, dead when device is unpowered)
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4 RX (3.3v high, fluctuating during transmission while UART device powered, dead when UART device unpowered)
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Note: this has been verified with a multimeter, it is the most common used pinout layout
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