STM32 photoresistor sensor & two channel AD acquisition

Photoresistor sensor

Schematic diagram

Tr_AO: Analog output , Turn the collected light into a continuous analog signal from Tr_AO Pin out .

Tr_DO: Adjust the RP7, Comparison with partial voltage of photosensitive resistance , adopt Tr_DO Output 0 or 1.

Code

Photo.c

#include "Photo.h"

uint32_t Get_Adc2(void)
{
	uint32_t adc_value;
	
	HAL_ADC_Start(&hadc2);
	if(HAL_ADC_PollForConversion(&hadc2,10) == HAL_OK)
	{
		adc_value = HAL_ADC_GetValue(&hadc2);
	}
	return adc_value;
}

 Photo.h

#ifndef _PHOTO_H_
#define _PHOTO_H_

#include "main.h"
#include "adc.h"

uint32_t Get_Adc2(void);

#endif

Display the partial pressure value

void Lcd_Proc(void)
{
	if(uwTick - lcd_uwTick < 200)
		return;
	lcd_uwTick = uwTick;
	
	sprintf((char *)lcd_disp_string,"photo_value: %d ",Get_Adc2());
	LCD_DisplayStringLine(Line3,lcd_disp_string);
	//" R-P:%.2fK  ", Get_Adc2() / (4096. - Get_Adc2()) * 10
	sprintf((char *)lcd_disp_string," R-P:%.2fK  ", Get_Adc2() / (4096. - Get_Adc2()) * 10);
	LCD_DisplayStringLine(Line4,lcd_disp_string);
	
	if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_3) == GPIO_PIN_SET)
	{
		sprintf((char *)lcd_disp_string,"  DO: high ");
	}
	else
	{
		sprintf((char *)lcd_disp_string,"  DO: low  ");
	}
	LCD_DisplayStringLine(Line5,lcd_disp_string);
}

---

Two ways AD collection

Different for acquisition AD Different channels of , It's easy , The following is to collect the same AD Different channels of .

Schematic diagram

 

The previous part is right ADC2 The initialization , The following is the configuration of the channel , But we use the same AD Different channels , And only one channel can be configured separately , So we can get ADC Values in the function , Delete the configuration in this function .

Pay attention to the pin configuration here .

2AD.c

#include "2AD.h"

uint32_t Get_adc1(void)
{
	uint32_t adc1;
	
	ADC_ChannelConfTypeDef sConfig = {0};
	
	sConfig.Channel = ADC_CHANNEL_17;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
	
  if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
	HAL_ADC_Start(&hadc2);
	
	if(HAL_ADC_PollForConversion(&hadc2,10) == HAL_OK)
	{
		adc1 = HAL_ADC_GetValue(&hadc2);
	}
	return adc1;
}

uint32_t Get_adc2(void)
{
	uint32_t adc2;
	
	ADC_ChannelConfTypeDef sConfig = {0};
	
	sConfig.Channel = ADC_CHANNEL_13;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;

	
  if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
	HAL_ADC_Start(&hadc2);
	
	if(HAL_ADC_PollForConversion(&hadc2,10) == HAL_OK)
	{
		adc2 = HAL_ADC_GetValue(&hadc2);
	}
	return adc2;
}

2AD.h

#include "main.h"
#include "adc.h"

uint32_t Get_adc1(void);
uint32_t Get_adc2(void);
	

Display voltage value function

void Lcd_Proc(void)
{
	if(uwTick - lcd_uwTick < 200)
		return;
	lcd_uwTick = uwTick;
	
	sprintf((char *)lcd_disp_string,"   RP5_V: %.2fV  ",Get_adc1() * 3.3 / 4096);
	LCD_DisplayStringLine(Line2,lcd_disp_string);
	
	sprintf((char *)lcd_disp_string,"   RP6_V: %.2fV  ",Get_adc2() * 3.3 / 4096);
	LCD_DisplayStringLine(Line3,lcd_disp_string);
}

In some cases, the order of these two values will be reversed when reading , Remember in 15 SCM reads two AD A similar situation has occurred when the value is , The solution was to read it twice , Then this one , Appropriate delay can be made , But I don't know why , When I wrote this program myself, I succeeded as soon as I wrote it , There is no problem of location exchange , therefore , There is the problem of position exchange , You can delay reading properly .