1개의 초음파센서 동작 속도 측정 방법?

function y = fcn(u)

if u >=0.5

y=1;

else

y=0;

end;

인 함수 블록에 입력되는

초음파센서가 입력된 함수의 출력=1 에서 출력=0이 될때까지의 시간을 측정할 수 있는 방법이 있나요?

Answer 1

[Shivani]

Hello @유나 정,

Based on my understanding, you are looking to clock the total time taken for the output of the function fcn() ,’y’, to change from 1 to 0. I am assuming that there is an external function that is capturing the data from the ultrasonic sensor and storing it in the input variable ‘u’. Since the code calling the function 'fcn()' is not shared in the question, I am assuming that the function is being called within a loop with unique ‘u’ values at every iteration.

To calculate the total time taken for variable ‘y’ to move from 1 to 0, we can use the ‘tic’ and ‘toc’ function. Refer to the sample code attached below for an example of how to use these functions to determine the total execution time. Please note that I am assuming ‘u’ to be populated by the function ‘readUltrasonicSensor()’.

prev_y = fcn(readUltrasonicSensor());  
startTime = tic;     
while true 
    u = readUltrasonicSensor();   
    y = fcn(u);  
    if prev_y == 1 && y == 0 
        elapsedTime = toc(startTime); % Measure time since start 
        fprintf('Time elapsed from start to output change (1 to 0): %f seconds\n', elapsedTime); 
        break;   
    end 
    prev_y = y;  
    pause(0.01);  
end 

Additionally, you can refer to the following documentation link for more information:

• https://www.mathworks.com/help/matlab/ref/tic.html
• https://www.mathworks.com/help/matlab/ref/toc.html

Hope this helps!