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working code with hex, bin and bin.txt output.
bit length and amount changeable

pi_numbers_seperated_USB.py

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+import os
+import serial
+import time
+
+ser = serial.Serial('/dev/ttyACM0', 115200) # change port to input port from arduino
+
+# define the number of numbers and bits per number to generate
+num_numbers = 5
+bits_per_number = 10001
+
+# calculate the total file size in bits
+filesize = num_numbers * bits_per_number
+
+# define the filename
+filename = f'{num_numbers}numbers_{bits_per_number}bits'
+
+start_time = time.time()  # start time of read
+
+with open(filename + '.bin', 'wb') as file:
+    for i in range(num_numbers):
+        # write the separator between numbers except for the last one
+        if i != num_numbers - 1:
+            file.write(b'//' + b'\n')
+        for j in range(bits_per_number // 8):
+            # read one byte from the serial port
+            byte = ser.read(1)
+            file.write(byte)
+
+end_time = time.time()  # end time of read
+elapsed_time = end_time - start_time 
+
+seconds = int(elapsed_time)
+milliseconds = int((elapsed_time % 1) * 1000)
+
+new_filename = f"{filename}_TimeInSeconds_{seconds}_{milliseconds}.bin" # filename in format filename_seconds_milliseconds as txt with needed time to finish read
+
+os.rename(filename + '.bin', new_filename)  # change filename to new filename
+
+# Open the file in binary mode
+with open(new_filename, 'rb') as f:
+    # Read the contents of the file as bytes
+    content = f.read()
+
+# Convert the bytes to a string of hexadecimal digits with zero padding
+hex_str = ''.join(format(byte, '02x') for byte in content).zfill(num_numbers * (bits_per_number // 4))
+
+# Write the hex string to the file with separators and newlines
+with open(filename + '.txt', 'w') as f:
+    for i in range(num_numbers):
+        hex_number = hex_str[i * (bits_per_number // 4) : (i+1) * (bits_per_number // 4)]
+        # write the separator between numbers except for the last one
+        if i != num_numbers - 1:
+            hex_number += '//'
+        f.write(hex_number + '\n')
+
+print(f"time needed in seconds: {elapsed_time:.2f}. New filename: {new_filename}.")  # console write
+
+# Open the file in binary mode
+with open(new_filename, 'rb') as f:
+    # Read the contents of the file as bytes
+    content = f.read()
+
+# Convert the bytes to a string of binary digits
+binary_str = ''.join(format(byte, '08b') for byte in content)
+
+# Write the binary string back to the file with separators
+with open(filename + '_binary.txt', 'w') as f:
+    for i in range(0, len(binary_str), bits_per_number):
+        binary_number = binary_str[i:i+bits_per_number]
+        f.write(binary_number + '\n')
+