20. [stm32] realize the function of intelligent garbage can by using ultrasonic module and steering gear

 

Author's brief introduction ： Hello, everyone , My name is DW, Share some of my new knowledge every day , Look forward to making progress with you
   
 
  Series column ：STM32
   
 

  Small experimental target ： Smart trash can
  If there is anything that is not well written, you are welcome to correct

Development board ：STM32F103
Creation time ：2022 year 6 month 27 Japan  

         In the previous post , We have learned how to use the ultrasonic ranging module , At the same time, I also know how to oled The measured data is displayed on , So today I will integrate the knowledge I learned before , Realize the function of intelligent garbage cans .

The specific functions are as follows ：

1. Can be in oled On Display the measured distance ;

2. When someone approaches to take out the garbage , The steering gear controls the trash can to open ; After taking out the garbage , The steering gear controls the trash can to close .

         In the last article, the principle and application method of ultrasonic module have been introduced in detail , On the basis of the last article , Add a steering gear program , Control the opening and closing of garbage cans .  

Hardware connection

OLED：

CS----PB5  
DC----PB6
D0----PB7  
D1----PB8
RST----PC13  
GND--- The earth
VCC---5V

HC_SR04:

Trig-----PA6
Echo----PA7
VCC-----5V
GND---- The earth

The steering gear ：

The signal line （ The yellow line ）：PB0  Red thread ：5V  Brown line ：GND

Use TIM3 Timer channel 3, Its corresponding PB0 Pin

         Prior to The first 12 Article online The process of using the steering gear has been explained in detail  , This article uses TIM3 Of CH1, This article USES TIM3 Of CH3, Modify several parameters based on the previous article .

12.[STM32]PWM Pulse width modulation - Steering gear control （ One is enough ）

	// Configure timer 3
    TIM_DeInit(TIM3);
	TIM_InitStructure.TIM_Period = 200-1;
	TIM_InitStructure.TIM_Prescaler = 7200-1;
	TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_InitStructure.TIM_RepetitionCounter = DISABLE;
	TIM_TimeBaseInit(TIM3,&TIM_InitStructure);
	TIM_ClearFlag(TIM3,TIM_FLAG_Update);
	
	
	PWM_InitStructure.TIM_OCMode = TIM_OCMode_PWM1;//PWM1
	PWM_InitStructure.TIM_OutputState = TIM_OutputState_Enable;
	PWM_InitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OC3Init(TIM3,&PWM_InitStructure);//CH3
	
	TIM_OC3PreloadConfig(TIM3,ENABLE);
	TIM_SetCompare3(TIM3,0);
	TIM_Cmd(TIM3,ENABLE);

         In the 19 Of the article void HC_SR04_Debolan(u8 mode)  Make a change in the function , When away from the garbage can 3~10cm when , Slowly open the trash can , Otherwise, the trash can is closed . The specific implementation process is as follows ：

void HC_SR04_Debolan(u8 mode){

	u16 data1 = 0,data2 = 0; u32 data = 0;
	static u8 flag;
	HC_SR04_Ranging(&data1,&data2);
	
	if(mode){  
	
		for(u8 i=0;i<5;i++){
		
			data = data + data1;
		}
	}
	else{	
	
		for(u8 i=0;i<5;i++){
		
			data = data + data2;
		}
	}
	data/=5;
	
	if((data >= 3) && (data) <= 10){
		
		if(flag == 0){
			
			flag=1;
			for(u16 i=15;i>5;i--){
			
				TIM_SetCompare3(TIM3,i);
				delay_ms(1);
			}
			delay_ms(1500);//1.5s  1.86s
		}
	}
	else{
		if(flag == 1){
			
			flag=0;
			for(u16 i=5;i<15;i++){
			
				TIM_SetCompare3(TIM3,i);
				delay_ms(1);
			}
		}
	}
	OLED_Write_Number(0,30,data);
}

thus , The program is all written , Compiling and burning code , We have successfully achieved the functions we need . 

In order to facilitate the next search , Remember to pay a little attention .

This chapter ends , I'll see you in the next chapter

Reference material ：

1.STM32 Firmware library manual

2. The punctual atoms STM32 Incomplete manual _ Library function version

3. Reference video

Data uploaded , You need to take it yourself