|  |  // 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)
 |  |  // 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)
 | 
											
												
													
														|  |  // some GPIOs go high for some time at boot, so using only active-low logic is advisable, particularly for switching outputs
 |  |  // some GPIOs go high for some time at boot, so using only active-low logic is advisable, particularly for switching outputs
 |