We do not engage in one-time transactions; we aim to be long-term partners in technical growth!
01
—
Physical Video Display
See the end of the article for data sharing
02
—
Project Overview
Title: Design of IoT Monitoring Node for Urban Noise and Air Quality Based on STM32 Microcontroller
Main Control: STM32F103C8T6
Display: OLED Display
Sensors:
Sound Sensor
PM2.5 Sensor
Carbon Dioxide Sensor
Air Quality Sensor
Bluetooth Module
Three Buttons
DC Power Supply
Functions:
1. The screen displays the current sound level, PM2.5 data, carbon dioxide sensor data, and air quality data in real-time.
2. Can connect to the microcontroller via Bluetooth to retrieve current data on a mobile phone.
3. Bluetooth can control the microcontroller.
4. Buttons can adjust thresholds, including maximum noise threshold, PM2.5 threshold, carbon dioxide threshold, and air quality threshold.
5. When data is outside the threshold, an audible and visual alarm is triggered.
03
—
Schematic Design
04
—
PCB Hardware Design
05
—
Program Design
#include "stm32f10x.h" // Device header
#include "delay.h"
#include "lcd.h"
#include "IOput.h"
#include "usart.h"
#include "adc.h"
extern u8 res;
void wifi() {
if(res=='a')
{
OLED_Clear();
res=0;
set_flag=1;
}
else if(res=='b')
{
res=0;
add_flag=1;
}
else if(res=='c')
{
res=0;
dec_flag=1;
}
}
float pm; // PM2.5 concentration
float AD_PM; // PM2.5 concentration obtained from AD conversion
void GetGP2Y(void) // Function to get PM2.5 concentration
{
LED = 1; // Turn off LED
delay_us(280); // Delay 280 microseconds
AD_PM = Get_Adc_Average(6, 10) * 3.3 * 2/ 4095; // Get and calculate AD conversion value
delay_us(40); // Delay 40 microseconds
LED = 0; // Turn on LED
delay_us(9680); // Delay 9680 microseconds
pm = AD_PM*100/0.37; // Convert voltage to PM2.5 concentration value
}
u8 gz,sw;
u8 show_flag,show1_flag,max_wd=100,dec_gz=30,dec_ts=60,dec_sd=40,count=0;
int main (void){
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
OLED_Init();
delay_ms(1);
OLED_Clear();
Adc_Init();
output_init();
input_init();
Usart2_Init(9600);
Usart1_Init(9600);
delay_ms(50);
while(1)
{
wifi();
GetGP2Y();
count++;
sw=100-Get_Adc_Average(1,10)*100/4096;
gz=Get_Adc_Average(0,10)*100/4096;
key_scan(1,0,0);
if((set_flag==1 && show_flag!=1))
{
OLED_Clear();
show1_flag=0;
set_flag=0;
show_flag++;
if(show_flag>=2)
{
show_flag=0;
}
}
if(show_flag==0)
{
OLED_ShowCH(0,0,"Urban Environmental Monitoring System");
OLED_ShowCH(0, 4, "PM2.5:"); // Display PM2.5
OLED_ShowNum(48, 4, pm, 4, 16);
OLED_ShowCH(88, 4, "ug/m3"); // Display unit
OLED_ShowCH(0,2,"Quality:");
OLED_ShowNum(40,2,gz,2,16);
OLED_ShowCH(64,2,"Noise:");
OLED_ShowNum(104,2,sw,2,16);
OLED_ShowCH(0,6,"C02:");
OLED_ShowNum(40,6,co2_ppm,4,16);
}
if(show_flag==1)
{
OLED_ShowCH(0,0,"Air Quality:");
OLED_ShowCH(0,2,"Max Noise:");
OLED_ShowCH(0,4,"PM2.5:");
OLED_ShowCH(0,6,"CO2:");
OLED_ShowNum(72,0,dec_gz,2,16);
OLED_ShowNum(72,2,dec_ts,2,16);
OLED_ShowNum(72,4,max_wd,3,16);
OLED_ShowNum(72,6,dec_sd,3,16);
if((set_flag==1 && show_flag==1))
{
set_flag=0;
show1_flag++;
if(show1_flag>=4)
{
show_flag=0;
OLED_Clear();
}
}
if(show1_flag==0)
{
OLED_ShowCH(112,0,"←");
if(add_flag==1)
{
add_flag=0;
dec_gz++;
}
if(dec_flag==1)
{
dec_flag=0;
dec_gz--;
}
if(dec_gz>=100 || dec_gz<=0){dec_gz=0;}
}
if(show1_flag==1)
{
OLED_ShowCH(112,2,"←");
if(add_flag==1)
{
add_flag=0;
dec_ts++;
}
if(dec_flag==1)
{
dec_flag=0;
dec_ts--;
}
if(dec_ts>=100 || dec_ts<=0){dec_ts=0;}
}
if(show1_flag==2)
{
OLED_ShowCH(112,4,"←");
if(add_flag==1)
{
add_flag=0;
max_wd++;
}
if(dec_flag==1)
{
dec_flag=0;
max_wd--;
}
if(max_wd>=200 || max_wd<=0){max_wd=0;}
}
if(show1_flag==3)
{
OLED_ShowCH(112,6,"←");
if(add_flag==1)
{
add_flag=0;
dec_sd++;
}
if(dec_flag==1)
{
dec_flag=0;
dec_sd--;
}
if(dec_sd>=200 || dec_sd<=35){dec_sd=35;}
}
}
if(gz>=dec_gz || sw>=dec_ts || pm>=max_wd || co2_ppm>=dec_sd*10)
BEEP=0;
else
BEEP=1;
if(count>=50)
{
count=0;
// UsartPrintf(USART1,"Temperature:%d\r\n",temp);
// UsartPrintf(USART1,"Humidity:%d\r\n",humi);
UsartPrintf(USART1,"Air Quality:%d\r\n",gz);
UsartPrintf(USART1,"Noise:%d\r\n",sw);
UsartPrintf(USART1,"CO2:%d\r\n",co2_ppm);
UsartPrintf(USART1,"PM2.5:%f\r\n",pm);
UsartPrintf(USART1,"\r\n\r\n");
}
}}
06
—
Data Sharing
Baidu Cloud Link:
https://pan.baidu.com/s/1AfQvrhOPOSRqZ78t1_4I7Q?pwd=82aq Extraction Code: 82aq
If the link is invalid, please click on the public account to contact us!