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// GPIO 1 = TX and 3=RX, so could only be used when no UART is needed (using only TX for debug output and RX as GPIO3 is possible)
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// GPIO 1 = TX and 3=RX, so could only be used when no UART is needed (using only TX for debug output and RX as GPIO3 is possible)
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// some GPIOs go high for some time at boot, so using only active-low logic is advisable, particularly for switching outputs
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// some GPIOs go high for some time at boot, so using only active-low logic is advisable, particularly for switching outputs
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