GP2Y1014AU Dust Sensor
Module Source
Purchase link: https://item.taobao.com/item.htm?spm=a1z09.2.0.0.7cc82e8df4Wdoa&id=44147655343&_u=82t4uge5bdc4
Specifications
Operating voltage: 5-7V Current consumption: max 20mA Minimum particle detection value: 0.8 microns Sensitivity: 0.5V(0.1mg/m3) Voltage in clean air: 0.9V (typical) Weight: 15g Dimensions: 46x30x17.6mm
View Materials
The GP2Y1014AU dust sensor has a hole in the middle through which air can flow freely. An infrared LED and a photoelectric transistor are installed at adjacent corner positions inside the sensor. The infrared LED directionally emits infrared light. When there are particles in the air that block the infrared rays, the infrared light undergoes diffuse reflection, and the photoelectric transistor receives the infrared light, causing the voltage at the signal output pin to change accordingly. Within a certain range, this voltage value has a linear relationship with the dust concentration. Therefore, during use, you need to use an ADC to collect this voltage signal and calculate the dust concentration in the air through this voltage value.
Porting Process
Pin Selection
Port to Project
Our goal is to port the example to the ESP32-S3 dev board. Complete driver code has been provided for you. Follow the steps below to complete the porting. For detailed instructions on creating folders and new .c and .h files, refer to section 1.4.2 in the [DHT11 Temperature and Humidity Sensor] chapter; we will not repeat it here. However, here we change the file names bsp_dht11.c and bsp_dht11.h to bsp_dust.c and bsp_dust.h, and rename the folder to Dust
Write Code
In the file bsp_dust.c, write the following code.
/*
* LCSC-Openkits (LCKFB) software and hardware materials and related expansion board software and hardware materials are all open source on the official website.
* Dev board official website: www.lckfb.com
* Technical support resides on the forum; any technical questions are welcome for exchange and learning at any time.
* LCKFB Forum: club.szlcsc.com
* Follow our Bilibili account: [LCSC-Openkits (LCKFB)] to keep up with our latest updates!
* We do not make money by selling boards; we take cultivating engineers as our mission.
* Change Logs:
* Date Author Notes
* 2024-01-09 LCKFB-lp first version
*/
#include "bsp_dust.h"
#include "stdio.h"
esp_adc_cal_characteristics_t *adc_chars;
void delay_ms(unsigned int ms)
{
vTaskDelay(ms / portTICK_PERIOD_MS);
}
void delay_us(unsigned int us)
{
ets_delay_us(us);
}
void delay_1ms(unsigned int ms)
{
vTaskDelay(ms / portTICK_PERIOD_MS);
}
void delay_1us(unsigned int us)
{
ets_delay_us(us);
}
/******************************************************************
* Function Name: Dust_GPIO_Init
* Function Description: Dust sensor pin initialization
* Function Parameters: none
* Function Return: none
* Author: LC
* Notes: none
******************************************************************/
void Dust_GPIO_Init(void)
{
gpio_config_t ll_config = {
.pin_bit_mask = (1ULL<<GPIO_LED), //Configure pin
.mode =GPIO_MODE_OUTPUT,
.pull_up_en = GPIO_PULLUP_DISABLE, //Disable pull-up
.pull_down_en = GPIO_PULLDOWN_DISABLE, //Disable pull-down
.intr_type = GPIO_INTR_DISABLE //Disable pin interrupt
};
gpio_config(&ll_config);
adc1_config_width(width);// 12-bit resolution
//ADC_ATTEN_DB_0: indicates reference voltage is 1.1V
//ADC_ATTEN_DB_2_5: indicates reference voltage is 1.5V
//ADC_ATTEN_DB_6: indicates reference voltage is 2.2V
//ADC_ATTEN_DB_11: indicates reference voltage is 3.3V
//adc1_config_channel_atten( channel,atten);// Set channel 0 and 3.3V reference voltage
// Allocate memory
adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
// Initialize ADC characteristics so that conversion results and compensation factors can be calculated correctly
esp_adc_cal_characterize(unit, atten, width, DEFAULT_VREF, adc_chars);
}
/******************************************************************
* Function Name: Get_ADC_Value
* Function Description: Calculate the average of ADC values and output
* Function Parameters: num = number of acquisitions
* Function Return: corresponding scanned ADC value
* Author: LC
* Notes: none
******************************************************************/
unsigned int Get_ADC_Value(unsigned int num)
{
unsigned int Data=0;
int i = 0;
for( i = 0; i < num; i++ )
{
/* Read ADC regular group data register */
Data += adc1_get_raw(channel);
delay_1ms(1);
}
Data = Data/num;
return Data;
}
int Filter(int m)
{
static int flag_first = 0, _buff[10], sum;
const int _buff_max = 10;
int i;
if (flag_first == 0)
{
flag_first = 1;
for (i = 0, sum = 0; i < _buff_max; i++)
{
_buff[i] = m;
sum += _buff[i];
}
return m;
}
else
{
sum -= _buff[0];
for (i = 0; i < (_buff_max - 1); i++)
{
_buff[i] = _buff[i + 1];
}
_buff[9] = m;
sum += _buff[9];
i = sum / 10.0;
return i;
}
}
/******************************************************************
* Function Name: Read_dust_concentration
* Function Description: Read dust concentration
* Function Parameters: none
* Function Return: dust concentration
* Author: LC
* Notes: none
******************************************************************/
float Read_dust_concentration(void)
{
unsigned int value=0;
float f_value = 0, density = 0;
gpio_set_level(GPIO_LED,0);
delay_1us(280);
value = Get_ADC_Value(20); // Acquire 20 times, calculate the average and assign to value
delay_1us(40);
gpio_set_level(GPIO_LED,1);
delay_1us(9680);
value = Filter(value);
f_value = 0.17*value-0.1; //Conversion formula
return f_value;
}2
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In the file bsp_dust.h, write the following code.
/*
* LCSC-Openkits (LCKFB) software and hardware materials and related expansion board software and hardware materials are all open source on the official website.
* Dev board official website: www.lckfb.com
* Technical support resides on the forum; any technical questions are welcome for exchange and learning at any time.
* LCKFB Forum: club.szlcsc.com
* Follow our Bilibili account: [LCSC-Openkits (LCKFB)] to keep up with our latest updates!
* We do not make money by selling boards; we take cultivating engineers as our mission.
* Change Logs:
* Date Author Notes
* 2024-01-09 LCKFB-lp first version
*/
#ifndef _BSP_DUST_H_
#define _BSP_DUST_H_
#include <stdio.h>
#include <inttypes.h>
#include "sdkconfig.h"
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_rom_sys.h"
#include "esp_timer.h"
#include "driver/uart.h"
#include "rom/ets_sys.h"
#include "esp_system.h"
#include "driver/gptimer.h"
#include "esp_log.h"
#include "freertos/queue.h"
#include "driver/spi_master.h"
#include "nvs_flash.h"
#include "esp_adc/adc_cali_scheme.h"
#include "esp_adc/adc_cali.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"
#define GPIO_OUT 1
#define GPIO_LED 2
#define DEFAULT_VREF 1100 //Default reference voltage, unit mV
#define channel ADC_CHANNEL_0 // ADC measurement channel
#define width ADC_WIDTH_BIT_12 // ADC resolution
#define atten ADC_ATTEN_DB_11 // ADC attenuation
#define unit ADC_UNIT_1 // ADC1
//Number of samples
#define SAMPLES 30
void delay_us(unsigned int us);
void delay_ms(unsigned int ms);
void delay_1us(unsigned int us);
void delay_1ms(unsigned int ms);
void Dust_GPIO_Init(void);
float Read_dust_concentration(void);
#endif2
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Porting Verification
In the main function of your own project, write the following code.
/*
* LCSC-Openkits (LCKFB) software and hardware materials and related expansion board software and hardware materials are all open source on the official website.
* Dev board official website: www.lckfb.com
* Technical support resides on the forum; any technical questions are welcome for exchange and learning at any time.
* LCKFB Forum: club.szlcsc.com
* Follow our Bilibili account: [LCSC-Openkits (LCKFB)] to keep up with our latest updates!
* We do not make money by selling boards; we take cultivating engineers as our mission.
* Change Logs:
* Date Author Notes
* 2024-01-09 LCKFB-lp first version
*/
#include <stdio.h>
#include "bsp_dust.h"
void app_main(void)
{
printf("demo start\r\n");
Dust_GPIO_Init();
while(1)
{
printf("Read_dust_concentration = %.2f\r\n",Read_dust_concentration());
delay_1ms(1000);
}
}2
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Power-on effect:
Driver code:
File Download
📌 Materials Download Center (click to jump)
📌 In the Materials Download Center -> Module Porting Materials Download, inside the compressed package of this chapter.