I/O

Advanced input and output functions. More...

Functions
unsigned long	pulseIn (uint8_t pin, uint8_t state, unsigned long timeout)
	Measures the duration of a pulse (in us) on the specified pin. More...
unsigned long	pulseInLong (uint8_t pin, uint8_t state, unsigned long timeout)
	Measures the duration of a pulse (in us) on the specified pin. More...
void	shiftOut (uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
	Sends out a byte of data on the specified data pin using the specified clock and bit order. More...
uint8_t	shiftIn (uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder)
	Shifts in data on a specified data pin using a specified clock pin and bit order. More...

Detailed Description

Advanced input and output functions.

Function Documentation

pulseIn()

unsigned long pulseIn	(	uint8_t	pin,
		uint8_t	state,
		unsigned long	timeout
	)

Measures the duration of a pulse (in us) on the specified pin.

/

The state parameter specifies the type of pulse to measure (HIGH or LOW). The timeout parameter specifies the maximum time to wait for the pulse to complete. This function works on pulses from 2-3 microseconds to 3 minutes in length. It cannot work in noInterrupt() context.

Parameters

pin	The pin number to measure the pulse on.
state	The type of pulse to measure (HIGH or LOW).
timeout	The maximum time to wait for the pulse to complete, in microseconds.

Returns

The duration of the pulse in microseconds, or 0 if no pulse starts before the timeout.

See also

https://www.arduino.cc/reference/en/language/functions/advanced-io/pulsein

pulseInLong()

unsigned long pulseInLong	(	uint8_t	pin,
		uint8_t	state,
		unsigned long	timeout
	)

Measures the duration of a pulse (in us) on the specified pin.

/

The state parameter specifies the type of pulse to measure (HIGH or LOW). The timeout parameter specifies the maximum time to wait for the pulse to complete. This function works on pulses from 2-3 microseconds to 3 minutes in length. It relies on the micros() function, so it cannot be used in noInterrupt() context.

Parameters

pin	The pin number to measure the pulse on.
state	The type of pulse to measure (HIGH or LOW).
timeout	The maximum time to wait for the pulse to complete, in microseconds.

Returns

The duration of the pulse in microseconds, or 0 if no pulse starts before the timeout.

See also

https://www.arduino.cc/reference/en/language/functions/advanced-io/pulseinlong

shiftIn()

uint8_t shiftIn	(	uint8_t	dataPin,
		uint8_t	clockPin,
		uint8_t	bitOrder
	)

Shifts in data on a specified data pin using a specified clock pin and bit order.

/

Parameters

dataPin	The pin on which to read the incoming data.
clockPin	The pin to toggle to signal the sending device that the Arduino is ready to receive the next bit.
bitOrder	The order in which to receive the bits (LSBFIRST or MSBFIRST).

Returns

The received data byte.

See also

https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftin

shiftOut()

void shiftOut	(	uint8_t	dataPin,
		uint8_t	clockPin,
		uint8_t	bitOrder,
		uint8_t	val
	)

Sends out a byte of data on the specified data pin using the specified clock and bit order.

/

Parameters

dataPin	The pin on which to output the data.
clockPin	The pin to toggle to signal the receiving device that the data is ready.
bitOrder	The order in which to send the bits (LSBFIRST or MSBFIRST).
val	The data byte to send.

See also

https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftout