Product images of the project:
Bilibili video link:
https://www.bilibili.com/video/BV1s5qYYAEHh/?share_source=copy_web&vd_source=097fdeaf6b6ecfed8a9ff7119c32faf2
(See the end of the article for data sharing)
01
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Project Introduction
1. Function Details
STM32 Smart Aquarium/Aquaculture System
The functions are as follows:
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Can detect temperature, water level, and TDS water quality, while displaying the data on an OLED screen.
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When the temperature is too high, Relay 1 engages for cooling; when too low, Relay 2 engages for heating. An abnormal condition triggers the buzzer alarm.
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When the water level is too low, Relay 3 operates to simulate water intake. When the water level is too high, Relay 4 operates to drain water.
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When TDS water quality is too high, Relays 3 and 4 operate sequentially to simulate water replacement.
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Can time feeding; after the countdown ends, the servo rotates to simulate feeding operation.
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Thresholds can be adjusted via buttons.
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Connects to a mobile app for remote data viewing, LED switch control, threshold adjustments, etc.
2. Bill of Materials
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STM32F103C8T6 Microcontroller
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OLED Screen
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DS18B20 Temperature Sensor
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ESP8266-01S WiFi Module
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TDS Conductivity Sensor
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Ultrasonic Sensor
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Relay
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Servo
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High-Power LED Module
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Active Buzzer
02
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Schematic Design
03
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PCB Hardware Design
PCB Diagram
04
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Program Design
#include "stm32f10x.h"
#include "sys.h"
#include "led.h"
#include "bmp.h"
#include "oled.h"
#include "adc.h"
#include "ds18b20.h"
#include "timer.h"
#include "delay.h"
#include "usart.h"
#include "usart2.h"
#include "cJSON.h"
#include "sr04.h"
int LED_STATUS = 0;
int FAN_STATUS = 0;
char WIFIName[] = "ESP8266-WIFI";
char WIFIpwd[] = "12345678";
int temp_up = 35,temp_down = 15; // Temperature upper and lower limits
int tds_up = 90,tds_down = 0; // Water quality upper and lower limits
int level_up = 5,level_down = 60; // Water level upper and lower limits
int maxHighLevel = 5; // Maximum water level for replacement
int feedTime = 30; // Feeding time
int cacheFeedTime = 30; // Cached feeding time
int sendDataTime = 3; // Data sending time
int cacheSendTime = 3; // Cached data sending time
#define LED PAout(2) // LED
#define BUZZ PAout(4) // Buzzer
#define JD1 PAout(8) // Relay 1 - Water extraction
#define JD2 PAout(5) // Relay 2 - Water drainage
#define JD3 PAout(6) // Relay 3 - Heating
#define JD4 PAout(7) // Relay 4 - Cooling
#define KEY_EDIT PBin(13) // Set button
#define KEY_NEXT PBin(14) // Switch button
#define KEY_SWIT PBin(15) // Next page button
#define KEY_ADD PAin(11) // Increment button
#define KEY_DEC PBin(12) // Decrement button
#define TEST PCout(13)
#define SG90_CLOSE 175 // Servo closed
#define SG90_OPEN 185 // Servo opened
// Upper computer data processing
int connectFlag = 0; // Connection success flag
int handleFlag = 0; // Flag to determine which data from the upper computer needs processing
int sendFlag = 0; // Timer time reached, this position indicates sending data
int initFlag = 0; // ESP8266 initialization success flag
int paramFlag = 1; // Whether to enable parameter check
int changeWaterFlag = 0; // Water change flag
int feedFlag = 0; // Whether to feed
int feedEndFlag = 0; // Feeding end
unsigned char temp = 0,level = 0; // Temperature, humidity
void paramCheck( void ); // Check if parameters exceed limits
void handleData( void ); // Upper computer data processing
void co2Process(void); // CO2 data processing
void DisplayUI( void ); // Fixed page UI rendering
void paramEdit( void ); // Threshold parameter setting
void editUiDisplay( int pageIndex ); // Set page UI initialization
void runAlter(int cursor,int count); // Execute parameter modification
extern char *USARTx_RX_BUF; // Serial data buffer
extern float TDS_value;
int main(void){
int time;
delay_init();
LED_Init();
OLED_Init();
Adc_Init();
DS18B20_Init();
// Temperature initialization
HC_SR04Config(); // Ultrasonic initialization
uart_init(115200);
timeInit(4999,7199); // 72M 0.1ms 500ms Serial data initialization,
timeSendInit(9999,7199); // 72m 0.1ms 1s Data sending timer
timePwmInit(199,7199); // PWM-> CH3->PA2 CH4->PA3 (Adjust pulse width)
TIM_SetCompare4(TIM2,100);
TIM_SetCompare4(TIM2,SG90_CLOSE); // Close feeding
OLED_ShowChLength(38,16,47,3); // Displaying startup
ESP8266Init(WIFIName,WIFIpwd);
OLED_Clear();
while(1){
DisplayUI();
if( time++ > 5 ){
time = 0;
temp = getTemperture(); // Get temperature
delay_ms(1000);
delay_ms(1000);
temp = getTemperture(); // Get temperature
TDS_Value_Conversion(); // Get TDS water quality value
}
level = Getlength(); // Get water level
OLED_ShowNum(45,0,temp,2,16,1);
OLED_ShowNum(45,16,level,3,16,1);
OLED_ShowNum(45,32,TDS_value,3,16,1);
OLED_ShowNum(76,48,cacheFeedTime,3,16,1);
OLED_Refresh();
// Start feeding
if( feedFlag ){
TIM_SetCompare4(TIM2,SG90_OPEN);
// Wait for feeding to end
if( feedEndFlag ){
feedFlag = 0;
feedEndFlag = 0;
feedTime = cacheFeedTime;
TIM_SetCompare4(TIM2,SG90_CLOSE);
}
}
// Enter settings page
if( !KEY_EDIT ){
while( !KEY_EDIT ); // Debounce
paramEdit(); // Enter parameter settings
// Refresh parameter prompt button (this button needs to be updated after entering settings)
if( !paramFlag ) OLED_ShowChLength(105,2,62,1);
else OLED_ShowString(105,2," ",16,1);
}
// Switch parameter reminder settings
if( !KEY_NEXT ){
while( !KEY_NEXT );
paramFlag = !paramFlag;
if( !paramFlag ){
JD2 = 0;
JD3 = 0;
JD4 = 0;
JD1 = 0;
BUZZ = 0;
OLED_ShowChLength(105,2,62,1);
}else{
OLED_ShowString(105,2," ",16,1);
}
OLED_Refresh();
}
// Upper computer changes data
if( handleFlag ) handleData();
// Upload data every 3 seconds
if( sendFlag && 1){
ESP8266Pub(temp,level,TDS_value);
sendFlag = 0; // Reset flag
sendDataTime = cacheSendTime; // Refresh sending time
}
// Check if parameters exceed limits (parameter check enabled)
if( paramFlag ) paramCheck();
delay_ms(100);
}}
05
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Experimental Results
Data Sharing (Baidu Cloud)
https://pan.baidu.com/s/1ChQKiFGKjoKkRzPhC7Olfw?pwd=vvsy Extraction code: vvsy
(Or scan the QR code below to obtain)
For physical purchases, scan the QR code below