Project finished product images:
Bilibili video link:
https://www.bilibili.com/video/BV1oi42117dp/?share_source=copy_web&vd_source=097fdeaf6b6ecfed8a9ff7119c32faf2
(See the end of the article for data sharing)
01
—
Project Introduction
1. Function Explanation
STM32 Home Environment Monitoring System (Gizwits)
Functions are as follows:
1) Detection Function: Environmental temperature and humidity data, smoke concentration data, PM2.5 concentration data.
2) Display Function: Display detected environmental data on the OLED screen.
3) Control Function: The system can control the fan, humidifier, and stepper motor.
4) Manual Mode: Control the operation of the fan, humidifier, and stepper motor through a mobile app.
5) Automatic Mode: The fan turns on when the environmental temperature exceeds the threshold, the humidifier turns on when the environmental humidity is below the threshold, the fan turns on and alarms when the environmental smoke concentration exceeds the threshold, and the window opens and alarms when the environmental PM2.5 concentration exceeds the threshold.
2. Material List
-
STM32F103C8T6 minimum system board
-
OLED display (4-pin I2C protocol)
-
MAX30302 heart rate and blood oxygen sensor
-
ADXL345 accelerometer
-
DS18B20 temperature sensor
-
Bluetooth module (BT04-A)
-
Buzzer
-
LED light
02
—
Schematic Design
03
—
PCB Hardware Design
1. PCB Diagram
2. PCB Board and Components Diagram
04
—
Program Design
int main(void){
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
OLED_Init();
ADCX_Init();
GP2Y_Init();
MQ2_Init();
DHT11_UserConfig();
MOTOR_UserConfig();
Key_Init();
Relay_Init();
Buzzer_Init();
Timer2_Init(9,14398);
uart2_init(9600);
uart1_init(115200);
GENERAL_TIM_Init();
userInit();
// Complete Gizwits initial assignment
gizwitsInit();
// Open a circular buffer
Delay_ms(500);
gizwitsSetMode(WIFI_AIRLINK_MODE);
IWDG_Init();
// Initialize watchdog
while (1)
{
IWDG_ReloadCounter(); // Reload counter value to feed the watchdog
switch(Menu)
{
case 1:
Menu1();
// Check if stepper motor needs to rotate
if(Window_Flag_ON == 1)
{
MOTOR_Direction_Angle(1,0,90,1); // Rotate 90 degrees clockwise
MOTOR_STOP();
Window_Flag_ON = 0;
}
if(Window_Flag_OFF == 1)
{
MOTOR_Direction_Angle(0,0,90,1); // Rotate 90 degrees counterclockwise
MOTOR_STOP();
Window_Flag_OFF = 0;
}
break;
case 2:
OLED_Clear();
Menu2();
Menu = 3;
// Used to check if threshold data has changed
old_Temp_value = Temp_value;
old_Humi_value = Humi_value;
old_Smog_value = Smog_value;
old_PM25_value = PM25_value;
break;
case 3:
// Display sensor threshold
OLED_ShowNum(1,13,Temp_value,2);
OLED_ShowNum(2,13,Humi_value,2);
OLED_ShowNum(3,13,Smog_value,4);
OLED_ShowNum(4,13,PM25_value,4);
// Threshold selection
if(KeyNum == 1)
{
KeyNum = 0;
value_Option_Num++;
if(value_Option_Num > 4)
{
value_Option_Num = 1;
}
}
// Display selection identifier ">"
OLED_Option(value_Option_Num);
// Adjust threshold values
switch(value_Option_Num)
{
case 1:
if(KeyNum == 3)
{
KeyNum = 0;
Temp_value++;
if(Temp_value >= 100)
{
Temp_value = 1;
}
}
if(KeyNum == 4)
{
KeyNum = 0;
Temp_value--;
if(Temp_value >= 100)
{
Temp_value = 99;
}
}
break;
case 2:
if(KeyNum == 3)
{
KeyNum = 0;
Humi_value++;
if(Humi_value >= 100)
{
Humi_value = 1;
}
}
if(KeyNum == 4)
{
KeyNum = 0;
Humi_value--;
if(Humi_value >= 100)
{
Humi_value = 99;
}
}
break;
case 3:
if(KeyNum == 3)
{
KeyNum = 0;
Smog_value++;
if(Smog_value >= 501)
{
Smog_value = 1;
}
}
if(KeyNum == 4)
{
KeyNum = 0;
Smog_value--;
if(Smog_value >= 5001)
{
Smog_value = 500;
}
}
break;
case 4:
if(KeyNum == 3)
{
KeyNum = 0;
PM25_value++;
if(PM25_value >= 501)
{
PM25_value = 1;
}
}
if(KeyNum == 4)
{
KeyNum = 0;
PM25_value--;
if(PM25_value >= 501)
{
PM25_value = 500;
}
}
break;
}
// Exit threshold setting interface
if(KeyNum == 2)
{
KeyNum = 0;
// Only write to FLASH when threshold data is changed
if((old_Temp_value != Temp_value) || (old_Humi_value != Humi_value) || (old_Smog_value != Smog_value) || (old_PM25_value != PM25_value))
{
// Write sensor threshold data
FLASH_W(FLASH_START_ADDR,Temp_value,Humi_value,Smog_value,PM25_value);
}
Menu = 1; // Return to main menu
OLED_Clear(); // Clear screen
}
break;
}
userHandle(); // Update Gizwits data point variable storage value
gizwitsHandle((dataPoint_t *)&currentDataPoint); // Data uploaded to Gizwits
}
} 05
—
Experimental Results
Data Sharing (Baidu Cloud)
https://pan.baidu.com/s/1sMYyoLFoEDbOZ_K0TbIfeA?pwd=mj26
Extraction code: mj26
(Or scan the QR code below to obtain)
