Problem with 3 accelerometer using python

[Sarun8755]

• ---

  I have struggle with 3 accelerometer(Model 352c33) using with DAQ(NI-9230BNC + cDAQ-917) with this code:

• import nidaqmx
  import csv
  import time
  import numpy as np

  # Define your accelerometer channel names here
  accelerometer_channels = ["cDAQ1Mod1/ai0", "cDAQ1Mod1/ai1", "cDAQ1Mod1/ai2"]

  # Create a task for analog input for each accelerometer channel
  tasks = []
  for channel in accelerometer_channels:
  task = nidaqmx.Task()
  task.ai_channels.add_ai_voltage_chan(channel)
  
  # Set the voltage range for each channel (adjust as needed)
  task.ai_channels[-1].ai_max = 5.0 # Set the maximum voltage to +5V
  task.ai_channels[-1].ai_min = -5.0 # Set the minimum voltage to -5V
  
  tasks.append(task)

  for i in range(30):
  # Start all tasks
  for task in tasks:
  task.start()

  # Read data from all channels
  data = [task.read(number_of_samples_per_channel=10000) for task in tasks]

  # Stop all tasks
  for task in tasks:
  task.stop()

  # Create a time axis
  time_axis = np.arange(len(data[0])) / 10000 # Assuming the same sampling rate for all channels

  # Save data to a CSV file
  csv_file = f"vibration_data{i}.csv"
  with open(csv_file, "w", newline="") as file:
  writer = csv.writer(file)
  writer.writerow(["Time (s)", "Channel 0", "Channel 1", "Channel 2"]) # Write header row
  for t, ch0, ch1, ch2 in zip(time_axis, *data):
  writer.writerow([t, ch0, ch1, ch2])

  # Sleep to wait for the next trial (optional)
  time.sleep(10.0) # Sleep for 10 seconds between trials

  # Close all tasks
  for task in tasks:
  task.close()
  
  
  

• Before this code i can use 1 accelerometer to detect vibration signal, but when i adjust the code to use 3. It only detect 1, i can’t use 3 together