Analog input

Detailed Description

Usage

1. Call pinMode() with INPUT_ANALOG
2. Optionally call analogReadSampleTime()
3. Call analogRead() to get a new sample (should take ~5us)

Example

#include <Arduino.h>

void setup() {
  Serial1.begin(115200);
  pinMode(PA5, INPUT_ANALOG);
}

void loop() {
  Serial1 << "PA5=" << analogRead(PA5) << "\n";
  delay(50);
}

Functions
void	analogReadSampleTime (uint8_t sampleTime)
	Set ADC sample time. More...
uint16_t	analogRead (uint8_t pin)
	Read a single pin. More...

Function Documentation

uint16_t analogRead

(

uint8_t

pin

)

Read a single pin.

Should take ~5us for (see analogReadSampleTime())

Parameters

pin	Pin name to read

Returns

The 12-bit (0-4096) value of the converted signal, with 0 = 0V, 4096 = 3.3V

void analogReadSampleTime

(

uint8_t

sampleTime

)

Set ADC sample time.

This should be seen as a type of filtering. The default is 13.5 cycles, which is the minimum for 12-bit accuracy.

Parameters

sampleTime

One of ADC_SampleTime_1Cycles5, ADC_SampleTime_7Cycles5, ADC_SampleTime_13Cycles5 (default), ADC_SampleTime_28Cycles5, ADC_SampleTime_41Cycles5, ADC_SampleTime_55Cycles5, ADC_SampleTime_71Cycles5, ADC_SampleTime_239Cycles5. (E.g. the default is 13.5 cycles sampling time)