I/O

Analog input and output functions. More...

Functions
int	analogRead (uint8_t pin)
	Reads the analog input on a specified analog pin. More...
void	analogWrite (uint8_t pin, int val)
	Writes an analog value (PWM wave) to a pin. More...
void	analogReference (uint8_t mode)
	Configures the reference voltage used for analog input (e.g., external, internal, etc.). More...
void	analogReadResolution (uint8_t bits)
	Sets the number of bits of resolution for the analogRead function. More...
void	analogWriteResolution (uint8_t bits)
	Sets the number of bits of resolution for the analogWrite function. More...
void	analogWriteFrequency (uint32_t frequency)
	Sets the frequency of the PWM on a pin. More...

Detailed Description

Analog input and output functions.

Function Documentation

analogRead()

int analogRead

(

uint8_t

pin

)

Reads the analog input on a specified analog pin.

/

Parameters

pin	The number of the analog input pin.

Returns

The analog value read from the pin.

See also

https://www.arduino.cc/reference/en/language/functions/analog-io/analogread

Reads the analog input on a specified analog pin.

This function reads an analog value from the specified pin. If the pin supports ADC, the analog value is read from the pin. If the pin does not support ADC, an error message is logged and 0 is returned.

Parameters

pin	The pin number.

Returns

The analog value read from the pin. If the pin does not support ADC, 0 is returned.

analogReadResolution()

void analogReadResolution

(

uint8_t

bits

)

Sets the number of bits of resolution for the analogRead function.

/

Parameters

bits	The number of bits (e.g., 8, 10, 12) for the resolution.

See also

https://www.arduino.cc/reference/en/language/functions/analog-io/analogreadresolution

Sets the number of bits of resolution for the analogRead function.

Parameters

bits	The resolution in bits.

analogReference()

void analogReference

(

uint8_t

mode

)

Configures the reference voltage used for analog input (e.g., external, internal, etc.).

/

Parameters

mode	The type of reference (e.g., DEFAULT, INTERNAL, EXTERNAL).

See also

https://www.arduino.cc/reference/en/language/functions/analog-io/analogreference

Configures the reference voltage used for analog input (e.g., external, internal, etc.).

This function is not yet implemented.

Parameters

mode	The reference voltage mode.

analogWrite()

void analogWrite	(	uint8_t	pin,
		int	val
	)

Writes an analog value (PWM wave) to a pin.

/

Parameters

pin	The number of the PWM pin.
val	The duty cycle: between 0 (always off) and 255 (always on).

See also

https://www.arduino.cc/reference/en/language/functions/analog-io/analogwrite

Writes an analog value (PWM wave) to a pin.

This function writes an analog value to the specified pin. If the pin supports PWM, the analog value is converted to a PWM duty cycle and applied to the pin. If the pin supports DAC, the analog value is converted to a DAC value and applied to the pin. If the pin does not support PWM or DAC, the function falls back to digital write.

Parameters

pin	The pin number.
val	The analog value to write.

analogWriteFrequency()

void analogWriteFrequency

(

uint32_t

frequency

)

Sets the frequency of the PWM on a pin.

/

Parameters

frequency

The desired frequency in Hertz (cycles per second).

See also

https://www.arduino.cc/reference/en/language/functions/analog-io/analogwritefrequency

Sets the frequency of the PWM on a pin.

Parameters

frequency

The frequency in Hz.

analogWriteResolution()

void analogWriteResolution

(

uint8_t

bits

)

Sets the number of bits of resolution for the analogWrite function.

/

Parameters

bits	The number of bits (e.g., 8, 10, 12) for the resolution.

See also

https://www.arduino.cc/reference/en/language/functions/analog-io/analogwriteresolution

Sets the number of bits of resolution for the analogWrite function.

Parameters

bits	The resolution in bits.