How would one go about using Matlab to stop data acquisition at a certain threshold?
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I'm working on a project involving taking in data, and I need to design a code which will stop the data collection once a certain threshold has been reached. I have a separate Python based program which I am using to take in the data, but I want to use Matlab in order to examine the data, while it is being acquired, and stop dats acquisition at a certain threshold. So to say, once data X reaches threshold Y, then warning Z will be displayed and data acquisition will be discontinued.
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KALASH
2024-6-9
Hi Zachary,
As you have not shared your python code on how you are acquiring the data in python and using MATLAB for a real time communication with the python script. I can give a workaround using some basic assumptions as shown in the code below:
MATLAB Script to Monitor Data and Stop Acquisition at Threshold
dataFilePath = 'path_to_data_file.txt'; % Path to the data file being written by Python
stopSignalPath = 'path_to_stop_signal.txt'; % Path to a stop signal file
threshold = Y; % Define your threshold value Y
checkInterval = 2; % Time in seconds between checks
while true
% Read the latest data from the file
data = dlmread(dataFilePath, ',');
% Assuming the data of interest is in a specific column, e.g., first column
latestData = data(end, 1); % Get the latest piece of data
% Check if the latest data exceeds the threshold
if latestData >= threshold
% Display warning
warning('Threshold reached. Data acquisition will be stopped.');
% Write a stop signal to a file (or another stop mechanism)
fid = fopen(stopSignalPath, 'w');
fprintf(fid, '%s', 'stop');
fclose(fid);
% Optionally, break the loop if no further processing is needed
break;
end
% Wait for a bit before checking again
pause(checkInterval);
end
Python Script
import time
stopSignalPath = 'path_to_stop_signal.txt'
while True:
# Your data acquisition logic here
# Check for the stop signal
try:
with open(stopSignalPath, 'r') as file:
signal = file.read().strip()
if signal == 'stop':
print("Stop signal received. Ending data acquisition.")
break
except FileNotFoundError:
# Handle the case where the MATLAB script hasn't created the file yet
pass
As this just an example script, feel free to adjust things according to your requirements.
Hope this helps!
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