ADC_start_conversion

Description

back to Command Reference / Analog-IO

Start ADC measurements for continuous conversion (see ADC_init()). Use measurement channel set via ADC_set_channel().

Notes:

• Only pins marked as AINx in respective device datasheet have ADC capability.
• For accurate ADC results configure the respective pin as INPUT via pinMode()
• ADC_start_conversion() has no effect in single shot mode
• continuous ADC conversion consumes comparatively high power --> use single-shot mode in energy sensitive applications

Inclusion

• defined in adc.h
• not loaded by main_general.h
• no #define required

Syntax

ADC_start_conversion()

Parameters

• input:

  • none

• output:

  • none

Returns

• Nothing

Example Code

The below code initializes the ADC for continuous measurements of pin AIN5.

#include "main_general.h"
#include "adc.h"

void setup()
{
  ADC_init(ADC_CONTINUOUS);
  ADC_set_channel(5);
  ADC_start_conversion();
}

void loop()
{
  uint16_t result;
  if (ADC_check_conversion_flag()) {
    result = ADC_get_result(5);
    ADC_reset_conversion_flag();
  }
  // ...do something with it
  delay(100);
}

Relevant Tutorial

• tbd

Notes and Warnings

To avoid damage

• do not expose I/Os to voltages outside [-0.3V; Vdd+0.3V], else limit injection currents to the specificied limits

See also

• ADC_init()
• ADC_measure()
• ADC_get_channel()
• ADC_get_channel()
• ADC_stop_conversion()
• ADC_check_conversion_flag()
• ADC_get_result()
• ADC_reset_conversion_flag()
• ADC_enable_interrupt()
• ADC_disable_interrupt()
• ADC_ISR()