AnalogIO

Functions
int	analogRead (uint8_t pin)
void	analogReference (eAnalogReference mode)
void	analogOversampling (uint32_t ulOversampling)
void	analogWrite (uint8_t pin, int value)
void	analogReadResolution (uint8_t bits)
void	analogWriteResolution (uint8_t bits)

Detailed Description

Function Documentation

analogRead()

int analogRead

(

uint8_t

pin

)

Description

Reads the value from the specified analog pin

Syntax

analogRead(pin);

Parameters

pin	the name of the analog input pin to read from

Returns

The analog reading on the pin(Type: int)

analogReference()

void analogReference

(

eAnalogReference

mode

)

Description

Configures the reference voltage used for analog input

Syntax

analogReference(type);

Parameters

type	which type of reference to use Type List: RAK_ADC_MODE_DEFAULT RAK_ADC_MODE_3_0 RAK_ADC_MODE_2_4 RAK_ADC_MODE_1_8 RAK_ADC_MODE_1_2

Returns

void

analogOversampling()

void analogOversampling

(

uint32_t

ulOversampling

)

analogWrite()

void analogWrite	(	uint8_t	pin,
		int	value
	)

Description

Writes an analog value (PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to analogWrite(), the pin will generate a steady rectangular wave of the specified duty cycle until the next call to analogWrite()

Syntax

analogWrite(pin, value)

Parameters

pin	the pin which you want to read
value	the duty cycle: between 0 (always off) and 255 (always on)

Returns

void

Example

int val = 0; // variable to write the LED pin
bool state = false;
bool ledSwitch = false;

void valChage()
{
  state = !state;
  if(val == 0)
    ledSwitch = !ledSwitch;
}

void setup() {
  // put your setup code here, to run once:
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(val == 0 || val == 255)
     valChage();

  // To determine to make the led lighter or darker
  if(state)
    val++;
  else
    val--;
  // To switch the lighting led
  if(ledSwitch)
    analogWrite(GREEN_LED ,val); // Light the green led
  else
    analogWrite(BLUE_LED, val); //Light the blue led

}

analogReadResolution()

void analogReadResolution

(

uint8_t

bits

)

Description

analogReadResolution() is an extension of the Analog API for the Zero, Due, MKR family, Nano 33 (BLE and IoT) and Portenta.

Sets the size (in bits) of the value returned by analogRead(). It defaults to 10 bits (returns values between 0-1023) for backward compatibility with AVR based boards.

Syntax

analogReadResolution(bits);

Parameters

bits	determines the resolution (in bits) of the value returned by the analogRead() function. You can set this between 1 and 32. You can set resolutions higher than the supported 12 or 16 bits, but values returned by analogRead() will suffer approximation

Returns

void

analogWriteResolution()

void analogWriteResolution

(

uint8_t

bits

)

Description

analogWriteResolution() is an extension of the Analog API for the Arduino Due.
analogWriteResolution() sets the resolution of the analogWrite() function. It defaults to 8 bits (values between 0-255) for backward compatibility with AVR based boards.

Syntax

analogWriteResolution(bits);

Parameters

bits

determines the resolution (in bits) of the values used in the analogWrite() function. The value can range from 1 to 32. If you choose a resolution higher or lower than your board’s hardware capabilities, the value used in analogWrite() will be either truncated if it’s too high or padded with zeros if it’s too low

Returns

void