One 、 The basic parameters

HC- SR04+ It is a wide voltage ultrasonic ranging module . The overall dimensions and software of the module are the same as those of the old version
HC- SR04 Fully compatible with ; It can be compared with the old version HC SR04 Seamless switching . As low as 3V Low operating voltage ,
Make it relate to 3.3V Powered by electricity MCU It can be connected directly .

characteristic
Detection angle : <15°
Industrial grade MCU, working temperature :-20C~80C
Detection distance :5V:2cm-- 450cm;3.3V: 2cm–400cm
Wide voltage operation : 3V-5.5V And HC SR04 Software and hardware dimensions are fully compatible
plate . Upper wiring mode ,VCC、trig ( Control terminal )、echo( The receiver )、out( Empty feet ,GND).

Be careful : The module should be plugged into the circuit board before being powered on , Avoid high-level maloperation , If it does ,
Power on again to solve .

Two 、 Communication timing

3、 ... and 、 Part of the code shows

//HC-SR04 Wiring definitions 
sbit INPUT  = P1^2;                // Echo receiving port 
sbit OUTPUT = P1^3;                // Ultrasonic trigger port 

//LCD1602 Wiring definitions 
//D0-D7----------P0
sbit rs    = P0^7;
sbit rw    = P0^6;
sbit lcden = P0^5;

/******************************************************************************/
/*  The name of the function  : main */
/*  Function description  :  The main function  */
/*  Input parameters  :  nothing  */
/*  Parameters to describe  :  nothing  */
/*  Return value  :  nothing  */
/******************************************************************************/					
void main(void)
{
    	
  rw = 0;
	initLCD();
	Init_MCU();
	Init_Parameter();
	
	display_char(table,0x00);
	display_char(table0,0x40);
	Delay_xMs(30000);
	display_char(table2,0x00);
	display_char(table1,0x40);

	while(1)
	{
    
		 Trig_SuperSonic();         // Trigger ultrasonic emission 
		 while(INPUT == 0)          // Waiting for echo 
         {
    
             ;
         }
		 Measure_Distance();        // Calculate the pulse width and convert it to distance 
		 display_char(table3,0x40);
		 display(distance,0x49);    // Show the distance 
		 Init_Parameter();          //  Parameter reinitialization 
		 delayt(100);               // Time delay , There must be at least 10ms interval 
	 }	
}

Four 、 The actual effect

summary

1、 Power supply 3.3V,5V All possible , Try not to supply more than 5V, No less than 3.3V
2、 The measured distance is the plane distance , The error of slope measurement will be particularly large
3、 The measuring angle is 15 Within degrees , Other objects blocking the measurement range will also affect the measurement results

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