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Embedded design and development project - liquid level detection and alarm system
2022-06-28 13:26:00 【Procedural deer】
Embedded design and development project - Liquid level detection alarm system
One 、 Implemented function
- ① Liquid level detection , adopt ADC A voltage analog liquid level sensor with a peripheral detection potentiometer , And calculate the liquid level height through the formula ;
- ② Threshold settings , Set the threshold value of liquid level through key peripherals ;
- ③ Threshold save , adopt IIC Peripherals save data to AT12C02 In the memory ;
- ④ Serial port query and output , Send specific characters through serial port peripherals ‘C’、‘S’ Query the liquid level height, level and threshold respectively . When the liquid level level level changes, the serial port sends real-time liquid level data ;
- ⑤ Status indication , adopt LED Peripheral LD1 With 1S The interval flashing indicates the operation status indicator ,LD2 With 0.2S Blinking at intervals 5 Times indicates that the liquid level level sends a change ,LD3 With 0.2S Blinking at intervals 5 Times indicates that the serial port has received information ;
Two 、 According to code implementation
1、 Master file main.c
#include "stm32f10x.h"
#include "lcd.h"
#include "led.h"
#include "key.h"
#include "usart.h"
#include "i2c.h"
#include "adc.h"
typedef unsigned char uchar;
typedef unsigned int uint;
uint uiAdc_Val; //R37 Analog liquid level sensor ADC value
uchar ucHeight,ucLevel,ucLevel1; // Liquid level height 、 Liquid level level level
uchar ucState,pucStr[21],pucTh[3],pucRcv[1]; //LCD Show buffer 、 Level threshold 、 Serial buffer
uchar ucLed,ucLd2,ucLd3,ucNum = 10; // Lighten up LED
uchar ucSec,ucSec1,ucKey_Long; // preservation ms、s, Long press the flag bit
unsigned long ulTick_ms; // The count of the tick timer
void KEY_Proc(void);
void LCD_Proc(void);
void ADC_Proc(void);
void UART_Proc(void);
//Main Body
int main(void)
{
SysTick_Config(SystemCoreClock/1000); // Set the system tick clock 1ms And can interrupt
KEY_Init(); // Key initialization
LED_Init(); //LED initialization
STM3210B_LCD_Init(); //LCD initialization
LCD_Clear(Blue); // Refresh the screen to blue
LCD_SetBackColor(Blue); // Set the font background to blue
LCD_SetTextColor(White); // Font set to white
USART2_Init(9600); // Serial initialization
i2c_init(); //IIC initialization
ADC1_Init(); //ADC initialization
i2c_read(pucTh,0,3); //AT24C02 Read from address 0 At the beginning 3 Bytes of data
if(pucTh[0] > 100)
pucTh[0] = 10;
if(pucTh[1] > 100)
pucTh[0] = 20;
if(pucTh[2] > 100)
pucTh[0] = 30;
while(1)
{
KEY_Proc(); // The function corresponding to the key
LCD_Proc(); //LCD Corresponding functions
ADC_Proc(); //ADC Collect corresponding functions
UART_Proc(); // Functions corresponding to serial port
}
}
/********************************************************************************************** * function ：void KEY_Proc(void) * function ： Key B1 Set the key ,B2 Toggle key ,B3 Add the key ,B4 Minus the key * Input ： nothing * Output ： nothing * Special instructions ： Each key does not affect each other **********************************************************************************************/
void KEY_Proc(void)
{
uchar ucKey_Val;
ucKey_Val = KEY_Scan(); // Check that the key is pressed
if(ucKey_Val != ucKey_Long)
ucKey_Long = ucKey_Val;
else
ucKey_Val = 0; // Prevent long press
switch(ucKey_Val)
{
case 1: //B1: Set the key
if(!ucState)
ucState = 1;
else
{
if((pucTh[0]) < pucTh[1] && pucTh[1] < pucTh[2])
{
LCD_DisplayStringLine(Line3,(u8*)" ");
i2c_write(pucTh , 0 , 3); //pucTh Threshold save to AT24C02
ucState = 0;
}
else
{
LCD_SetTextColor(Red);
LCD_DisplayStringLine(Line3,(u8*)" Threshold Error "); // Error in setting the threshold
LCD_SetTextColor(White);
}
}
break;
case 2: //B2: Toggle key
if(ucState)
if(++ucState == 4)
ucState = 1;
break;
case 3: //B3: Threshold plus
if(ucState)
if(pucTh[ucState-1] < 95)
pucTh[ucState-1] +=5;
break;
case 4: //B3: The threshold is reduced
if(ucState)
if(pucTh[ucState-1] > 5)
pucTh[ucState-1] -=5;
break;
}
}
/********************************************************************************************** * function ：void LCD_Proc(void) * function ：LCD Screen display function * Input ： nothing * Output ： nothing * Special instructions ： nothing **********************************************************************************************/
void LCD_Proc(void)
{
float temp;
if(!ucState) //0 Display the status interface , It's not equal to 0 Display the setting interface
{
LCD_DisplayStringLine(Line1,(u8*)" Liquid Level ");
sprintf((char*)pucStr," Height:%03ucm ",ucHeight);
LCD_DisplayStringLine(Line4,pucStr);
temp = (float)uiAdc_Val * 3.3 /4095;
sprintf((char*)pucStr," VR37: %4.3fV ",temp);
LCD_DisplayStringLine(Line6,pucStr);
sprintf((char*)pucStr," Level: %01u ",ucLevel);
LCD_DisplayStringLine(Line8,pucStr);
}
else
{
LCD_DisplayStringLine(Line1,(u8*)" Threshold Setup ");
// The index is on page 1 Threshold settings
sprintf((char*)pucStr," Threshold 1: %02ucm ",pucTh[0]);
if(ucState == 1)
LCD_SetBackColor(Red);
LCD_DisplayStringLine(Line4,pucStr);
LCD_SetBackColor(Blue);
// The index is on page 2 Threshold settings
sprintf((char*)pucStr," Threshold 2: %02ucm ",pucTh[1]);
if(ucState == 2)
LCD_SetBackColor(Red);
LCD_DisplayStringLine(Line6,pucStr);
LCD_SetBackColor(Blue);
// The index is on page 3 Threshold settings
sprintf((char*)pucStr," Threshold 3: %02ucm ",pucTh[2]);
if(ucState == 3)
LCD_SetBackColor(Red);
LCD_DisplayStringLine(Line8,pucStr);
LCD_SetBackColor(Blue);
}
}
/********************************************************************************************** * function ：void ADC_Proc(void) * function ：ADC Acquisition potentiometer R37 The voltage signal of * Input ： nothing * Output ： nothing * Special instructions ： nothing **********************************************************************************************/
void ADC_Proc(void)
{
if(!ucState && ucSec != ucSec1)
{
ucSec1 = ucSec;
uiAdc_Val = ADC1_Conv(); // Obtain the replacement value
ucHeight = uiAdc_Val*100/4095; // Calculate the liquid level ADC_Val = V * 4095 / 3.3
if(ucHeight < pucTh[0])
ucLevel = 0;
else if(ucHeight < pucTh[1])
ucLevel = 1;
else if(ucHeight < pucTh[2])
ucLevel = 2;
else
ucLevel = 3;
if(ucLevel != ucLevel1)
{
if(ucLevel > ucLevel1) // The liquid level rises
printf("A:H%02u+L%01u+U\r\n",ucHeight,ucLevel);
else // The liquid level decreases
printf("A:H%02u+L%01u+D\r\n",ucHeight,ucLevel);
ucLevel1 = ucLevel;
ucLd2 = 1; // Grade change
}
}
}
/********************************************************************************************** * function ：void UART_Proc(void) * function ： Serial port query and sending function * Input ： nothing * Output ： nothing * Special instructions ： nothing **********************************************************************************************/
void UART_Proc(void)
{
if(pucRcv[0] == 'C')
printf("C:H%02u+L%01u\r\n",ucHeight,ucLevel);
if(pucRcv[0] == 'S')
printf("S:TL%02u+TM%02u+TH%02u\r\n",pucTh[0],pucTh[1],pucTh[2]);
if(pucRcv[0] == 'C' || pucRcv[0] == 'S')
ucLd3 = 1; // Serial port query
pucRcv[0] = 0;
}
/********************************************************************************************** * function ：void SysTick_Handler(void) * function ： Tick timer interrupt function * Input ： nothing * Output ： nothing * Special instructions ： Every time 1 Mode enters once **********************************************************************************************/
void SysTick_Handler(void)
{
ulTick_ms++;
if(ulTick_ms%1000 == 0)
{
ucSec++;
ucLed ^=1; //LD1 flashing
}
if(ucLd2)
{
if(ulTick_ms%200 == 0)
{
if(ucNum--)
ucLed ^= 2; //LD2 flashing 5 Time
else
{
ucLd2 = 0;
ucNum = 10;
}
}
}
if(ucLd3)
{
if(ulTick_ms%200 == 0)
{
if(ucNum--)
ucLed ^= 4; //LD3 flashing 5 Time
else
{
ucLd3 = 0;
ucNum = 10;
}
}
}
LED_Disp(ucLed);
}
/********************************************************************************************** * function ：void USART2_IRQHandler( void ) * function ： Receiving serial port 2 The data of * Input ： nothing * Output ： nothing * Special instructions ： Receiving serial port 2 The interrupt service function of **********************************************************************************************/
void USART2_IRQHandler(void)
{
pucRcv[0] = USART_ReceiveData(USART2);
}
Principal function analysis ：️ ️ ️
- Define global variables , Functions in the current source file can be cross assigned and used .
- Each peripheral of the main control chip shall be modularized as much as possible , Each function is responsible for the function of a peripheral .
- Three are defined ucLevel1、ucSec1、ucKey_Long Variable , Save the last level level respectively 、 Time 、 Key value , thus Judge the liquid level level in real time 、 Time delay 1S、 Prevent long press The function of .
2、void KEY_Proc(void) Key processing program design
/********************************************************************************************** * function ：void KEY_Proc(void) * function ： Key B1 Set the key ,B2 Toggle key ,B3 Add the key ,B4 Minus the key * Input ： nothing * Output ： nothing * Special instructions ： Each key does not affect each other **********************************************************************************************/
void KEY_Proc(void)
{
uchar ucKey_Val;
ucKey_Val = KEY_Scan(); // Check that the key is pressed
if(ucKey_Val != ucKey_Long)
ucKey_Long = ucKey_Val;
else
ucKey_Val = 0; // Prevent long press
switch(ucKey_Val)
{
case 1: //B1: Set the key
if(!ucState)
ucState = 1;
else
{
if((pucTh[0]) < pucTh[1] && pucTh[1] < pucTh[2])
{
LCD_DisplayStringLine(Line3,(u8*)" ");
i2c_write(pucTh , 0 , 3); //pucTh Threshold save to AT24C02
ucState = 0;
}
else
{
LCD_SetTextColor(Red);
LCD_DisplayStringLine(Line3,(u8*)" Threshold Error "); // Error in setting the threshold
LCD_SetTextColor(White);
}
}
break;
case 2: //B2: Toggle key
if(ucState)
if(++ucState == 4)
ucState = 1;
break;
case 3: //B3: Threshold plus
if(ucState)
if(pucTh[ucState-1] < 95)
pucTh[ucState-1] +=5;
break;
case 4: //B3: The threshold is reduced
if(ucState)
if(pucTh[ucState-1] > 5)
pucTh[ucState-1] -=5;
break;
}
}
Key KEY Brief analysis ：️ ️
- Definition ucKey_Long Sign a , Prevent long press to execute the function of the key ;
- Definition pucTh[3] Data can be used as a function i2c_write Of （unsigned char*） The ginseng , Save the data in order AT24C02 In the memory ;
- If ucState Greater than 0, Judgment is the setting interface , Thus, the toggle key can be executed 、 Threshold plus 、 Operation of threshold subtraction .
- Use... Cleverly ucState Judge the threshold setting of the current switching level , And can use the threshold array pucTh Set up .
3、LCD Handler design
/********************************************************************************************** * function ：void LCD_Proc(void) * function ：LCD Screen display function * Input ： nothing * Output ： nothing * Special instructions ： nothing **********************************************************************************************/
void LCD_Proc(void)
{
float temp;
if(!ucState) //0 Display the status interface , It's not equal to 0 Display the setting interface
{
LCD_DisplayStringLine(Line1,(u8*)" Liquid Level ");
sprintf((char*)pucStr," Height:%03ucm ",ucHeight);
LCD_DisplayStringLine(Line4,pucStr);
temp = (float)uiAdc_Val * 3.3 /4095;
sprintf((char*)pucStr," VR37: %4.3fV ",temp);
LCD_DisplayStringLine(Line6,pucStr);
sprintf((char*)pucStr," Level: %01u ",ucLevel);
LCD_DisplayStringLine(Line8,pucStr);
}
else
{
LCD_DisplayStringLine(Line1,(u8*)" Threshold Setup ");
// The index is on page 1 Threshold settings
sprintf((char*)pucStr," Threshold 1: %02ucm ",pucTh[0]);
if(ucState == 1)
LCD_SetBackColor(Red);
LCD_DisplayStringLine(Line4,pucStr);
LCD_SetBackColor(Blue);
// The index is on page 2 Threshold settings
sprintf((char*)pucStr," Threshold 2: %02ucm ",pucTh[1]);
if(ucState == 2)
LCD_SetBackColor(Red);
LCD_DisplayStringLine(Line6,pucStr);
LCD_SetBackColor(Blue);
// The index is on page 3 Threshold settings
sprintf((char*)pucStr," Threshold 3: %02ucm ",pucTh[2]);
if(ucState == 3)
LCD_SetBackColor(Red);
LCD_DisplayStringLine(Line8,pucStr);
LCD_SetBackColor(Blue);
}
}
LCD Screen brief analysis ：️ ️
- If ucState by 0, yes Liquid level status display Interface , It is Set up Interface .
- Clever use of Space Overlap another interface to display data ;
5、ADC Handler design
/********************************************************************************************** * function ：void ADC_Proc(void) * function ：ADC Acquisition potentiometer R37 The voltage signal of * Input ： nothing * Output ： nothing * Special instructions ： nothing **********************************************************************************************/
void ADC_Proc(void)
{
if(!ucState && ucSec != ucSec1)
{
ucSec1 = ucSec;
uiAdc_Val = ADC1_Conv(); // Obtain the replacement value
ucHeight = uiAdc_Val*100/4095; // Calculate the liquid level ADC_Val = V * 4095 / 3.3
if(ucHeight < pucTh[0])
ucLevel = 0;
else if(ucHeight < pucTh[1])
ucLevel = 1;
else if(ucHeight < pucTh[2])
ucLevel = 2;
else
ucLevel = 3;
if(ucLevel != ucLevel1)
{
if(ucLevel > ucLevel1) // The liquid level rises
printf("A:H%02u+L%01u+U\r\n",ucHeight,ucLevel);
else // The liquid level decreases
printf("A:H%02u+L%01u+D\r\n",ucHeight,ucLevel);
ucLevel1 = ucLevel;
ucLd2 = 1; // Grade change
}
}
}
ADC Brief analysis of analog liquid level voltage ：️ ️
- On the liquid level display interface , Conduct 1S Collect once Analog liquid level voltage potentiometer ;
- According to the obtained AD Value for Formula conversion For height , Judge whether the height is within the threshold range of liquid level , So as to know the current liquid level level ;
- adopt ucLevel1 Judge the level level Send changes , Send the corresponding message to the serial port according to the liquid level change , And carry on Ld2 Of 5 Secondary flicker .
6、UART Handler design
/********************************************************************************************** * function ：void UART_Proc(void) * function ： Serial port query and sending function * Input ： nothing * Output ： nothing * Special instructions ： nothing **********************************************************************************************/
void UART_Proc(void)
{
if(pucRcv[0] == 'C')
printf("C:H%02u+L%01u\r\n",ucHeight,ucLevel);
if(pucRcv[0] == 'S')
printf("S:TL%02u+TM%02u+TH%02u\r\n",pucTh[0],pucTh[1],pucTh[2]);
if(pucRcv[0] == 'C' || pucRcv[0] == 'S')
ucLd3 = 1; // Serial port query
pucRcv[0] = 0;
}
A serial port UART Brief analysis ：️ ️
- Judge the characters received by the serial port , Whether it is consistent with the system setting parameters , Perform corresponding functions .
- After receiving , Put the pucRcv Buffer restore defaults .
7、LED Handler design
/********************************************************************************************** * function ：void SysTick_Handler(void) * function ： Tick timer interrupt function * Input ： nothing * Output ： nothing * Special instructions ： Every time 1 Mode enters once **********************************************************************************************/
void SysTick_Handler(void)
{
ulTick_ms++;
if(ulTick_ms%1000 == 0)
{
ucSec++;
ucLed ^=1; //LD1 flashing
}
if(ucLd2)
{
if(ulTick_ms%200 == 0)
{
if(ucNum--)
ucLed ^= 2; //LD2 flashing 5 Time
else
{
ucLd2 = 0;
ucNum = 10;
}
}
}
if(ucLd3)
{
if(ulTick_ms%200 == 0)
{
if(ucNum--)
ucLed ^= 4; //LD3 flashing 5 Time
else
{
ucLd3 = 0;
ucNum = 10;
}
}
}
LED_Disp(ucLed);
}
Brief analysis of the system tick timer ：️ ️
- Set up 1ms, Interrupt entering this function once , Achieve accurate timing .
- If the level level level sends a change , be LD2 flashing 5 Time ; If you receive a command from the serial port , be LD3 Flashing 5 Time , Clear the flag bit after flashing .
8、USART2 Handler design
/********************************************************************************************** * function ：void USART2_IRQHandler( void ) * function ： Receiving serial port 2 The data of * Input ： nothing * Output ： nothing * Special instructions ： Receiving serial port 2 The interrupt service function of **********************************************************************************************/
void USART2_IRQHandler(void)
{
pucRcv[0] = USART_ReceiveData(USART2);
}
Brief analysis ：️ ️
- Serial interrupt function , The serial port receives the data entry interrupt and saves the data to pucRcv Array .
3、 ... and 、 Attention and learning points in the process of realizing functions
1、 Be careful
① How to define global variables , Coupling various peripheral functions together ！
2、 What to learn
- ① Realize modular programming , The function of each peripheral defines a function separately ;
- ② Cleverly define an array , Save the thresholds for each level of the liquid level , It also realizes the addition and subtraction of the threshold ;
- ③ Learn to define flags , Determine whether the current state has changed , Prevent long press of key 、 Level level change detection and other functions ;
- ④ Realize the interrupt receiving service function of the serial port ;
️ ️ ️ ️ ️ ️
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