如何在PIC微控制器中添加两个超声波传感器
[英]how to add two ultrasonic sensors to PIC microcontroller
问题描述
i am in troble with when using two ulrasonic sensores, but when working with one sensore, code is working fine. 
我在使用两个超声波传感器时遇到麻烦，但是在使用一个超声波传感器时，代码工作正常。 please help me to attach two ultarsnic sensores (HC-SR04) to my code and make this worke fine, 请帮助我在我的代码上附加两个ultansnic传感器（HC-SR04），并使其正常工作，
here i am tring to do thing is i want to keep a object with in the range and if the object move LED lights need to be on. 在这里，我想做的事情是我想将物体保持在范围内，如果物体移动，则需要打开LED灯。
i am using the PIC 16F877A 我正在使用PIC 16F877A
Working code for one ultrasonic sensor 一个超声波传感器的工作代码
void main()
{
int a;
int b;
TRISB = 0b00010000; //RB4 as Input PIN (ECHO)
TRISC = 0; //C as Output PINs (LED)
T1CON = 0x10; //Initialize Timer Module
TRISD = 1; // 1 input 0 output ,related to LED (display)
while(1)
{
for(b=1; b<3; b++){
if (b=2){
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer
PORTB.F1 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F1 = 0; //TRIGGER LOW
while(!PORTD.F0); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTD.F0); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops
a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration\
//formular s=ut
if(a != 4 ){
PORTC = 0b01111111; // turn on LEDs in the PIC
Delay_ms(5);
PORTC = 0; // turn on LEDs in the PIC
} else {
//out of range
PORTC = 0b00000000;
}
}
}
}
}
not working code for two ultarsonic sensers 两个ultarsonic传感器的无效代码
void main()
{
int a;
int b;
TRISB = 0b00010000; //RB4 as Input PIN (ECHO)
TRISC = 0; //C as Output PINs (LED)
T1CON = 0x10; //Initialize Timer Module
TRISD = 1; // 1 input 0 output ,related to LED (display)
while(1)
{
for(b=1; b<3; b++){
if(b=1){
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer
PORTB.F0 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F0 = 0; //TRIGGER LOW
while(!PORTD.F1); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTD.F1); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops
a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration\
//formular s=ut
if(a != 4 ){
// PORTB.F3 = 1;
// PORTD = 0xFC; // display number two in LED displa
// Delay_ms(5);
// PORTB.F3 = 0;
PORTC = 0b00000011; // turn on LEDs in the PIC
Delay_ms(5);
PORTC = 0; // turn on LEDs in the PIC
} else {
//out of range
PORTC = 0b00000000;
}
}
else if (b=2){
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer
PORTB.F1 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F1 = 0; //TRIGGER LOW
while(!PORTD.F0); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTD.F0); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops
a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration\
//formular s=ut
if(a != 4 ){
PORTC = 0b01111111; // turn on LEDs in the PIC
Delay_ms(5);
PORTC = 0; // turn on LEDs in the PIC
} else {
//out of range
PORTC = 0b00000000;
}
}
}
}
}
2 个解决方案
解决方案1
1 2017-03-28 06:14:54
Because of all the blocking waits on signal values to change, what you have effectively done is to use only one sensor at a time. 由于所有阻塞都等待信号值的改变，因此您实际上要做的是一次只使用一个传感器。 If you want to use multiple sensors at the same time, you'll need to either interleave the logic for both sensors or use interrupts. 如果要同时使用多个传感器，则需要为两个传感器交错逻辑或使用中断。
Additionally, depending on the scale of the distances being measured, the cut off point of distance between object and sensor should be adjusted to take the relative distance between sensors themselves into account. 此外，根据被测距离的大小，应调整对象与传感器之间的距离的截止点，以考虑到传感器自身之间的相对距离。
解决方案2
1 2017-03-29 08:47:31
Here is the answer code for two ultrasonic sensors 这是两个超声波传感器的答案代码
void main()
{
int a;
int b;
TRISB = 0b00011000; //RB4 and RB5 as Input PIN (ECHO)
TRISC = 0; //C as Output PINs (LED)
T1CON = 0x10; //Initialize Timer Module
TRISD = 1; // 1 input 0 output ,related to LED (display)
while(1)
{
for(b=1; b<3; b++){
if(b==1){
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer
PORTB.F0 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F0 = 0; //TRIGGER LOW
while(!PORTB.F4); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTB.F4); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops
a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration\
//formular s=ut
if(a != 4 ){
PORTC = 0b00000011; // turn on LEDs in the PIC
Delay_ms(5);
PORTC = 0; // turn on LEDs in the PIC
} else {
//out of range
PORTC = 0b00000000;
}
}
else if (b==2){
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer
PORTB.F1 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F1 = 0; //TRIGGER LOW
while(!PORTB.F5); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTB.F5); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops
a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration\
//formular s=ut
if(a != 4 ){
PORTC = 0b01111111; // turn on LEDs in the PIC
Delay_ms(5);
PORTC = 0; // turn on LEDs in the PIC
} else {
//out of range
PORTC = 0b00000000;
}
}
}
}
}
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