How to get time of first and second rising edge for the period(simulink)?

By the way, I have to calculate the speed of the signal I get from the Hall effect encoder. I decided to use the fronts so in real time I get the current montan front and the previous one to do the delta and I will have the period continuously. Now I can't synchronize the times so as not to have infinity or a nan at the exit. I've tried everything I know. Please help.6

Answer 1

[Satwik]

Hi,

I understand you want to calculate the speed of the signal obtained from a Hall effect encoder using the rising edges. However, you are encountering issues with synchronizing the timestamps, which is leading to infinite or NaN values in your output. Here is an example that can help you achieve this objective and address the synchronization challenge:

% Example setup
fs = 1000; % Sampling frequency (Hz)
t = 0:1/fs:10; % Time vector (10 seconds)

% Example: Generate a random signal
signal = randn(size(t)); % Replace this with your actual signal
timeVector = t; % Use the time vector corresponding to your signal

% Initialize variables
previousTimestamp = NaN;
currentTimestamp = NaN;
speed = 0;

% Process the signal to detect rising edges and calculate speed[AA2] [SM3] 
for i = 2:length(signal)
    
    % Detect rising edge
    if signal(i) > signal(i-1)
        % Update timestamps
        previousTimestamp = currentTimestamp;       
        currentTimestamp = timeVector(i);     
        
        % Calculate time difference     
        if ~isnan(previousTimestamp)
            timeDifference = currentTimestamp - previousTimestamp;
            
            % Avoid division by zero
            if timeDifference > 0
                % Calculate speed (example calculation)
                speed = 1 / timeDifference; % Adjust the formula based on your application
            else
                speed = NaN; % Handle zero or negative time differences
            end
            
        end
        
    end
    
    % Output the speed value
    disp(['Speed at time ', num2str(timeVector(i)), ': ', num2str(speed)]);
    
end

This example simulates a signal from a Hall effect encoder using a square wave. It detects rising edges by checking when the current signal value is greater than the previous value. When a rising edge is detected, timestamps are updated and the time difference between consecutive rising edges is calculated. The speed is calculated as the inverse of this time difference.

Hope this helps!