The Industrial Raspberry Pi Forum

Posted: **25 Nov 2024, 21:32**

Hi to everybody, I'm new in the forum and also a beginner with this device! So please patience with me.
I'm a worker on automation field, normally I work with PLC and HMI, this is my world while Raspberry is quite dark for me.
I have more than a few client that asked me to give them some production log by csv file exported in a USB. In automation field it happens very often to works with old machinery where an ethernet cable is unthinkble to carry. So the easiest solution is the USB.
I know that by default linux does not recognize a new hardware and it's required to mount/unmount the disk ecc.

My goal would be to make the whole procedure automatic (clear some action from operator must be done for example click button export...) but as I told at the begin I'm really a begginer.

So there's somebody can help me with some sample or some manual/guide to give me the right direction?

Really thank's in advanced!

Posted: **06 Dec 2024, 12:53**

Hi JohnDorian,
Welcome to the forum, and thank you for reaching out.
Your use case is a common scenario in automation, and you're absolutely on the right track exploring Raspberry Pi and Linux for solving it. I'll guide you step-by-step to automate the process of exporting logs to a USB drive when it's plugged in.

Overview of the Solution
The process involves:

Detecting when a USB drive is connected.

Automatically mounting the USB drive.

Copying your logs (or exporting your CSV files) to the USB.

Safely unmounting the USB drive to avoid data corruption.

Step-by-Step Instructions

1. Detect the USB Drive
Linux uses udev to manage hardware events. We can create a rule to detect when a USB drive is inserted and trigger a custom script.

Open a terminal and create a new udev rule:

Code: Select all

sudo nano /etc/udev/rules.d/99-usb-auto-export.rules

Add the following rule to execute a script when a USB drive is inserted:

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ACTION=="add", KERNEL=="sd[a-z][0-9]", RUN+="/usr/local/bin/usb-export-logs.sh"

Reload the udev rules:

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sudo udevadm control --reload-rules

2. Write the Export Script

This script will handle mounting the USB drive, copying the logs, and optionally unmounting it after the operation.

Create the script file:

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sudo nano /usr/local/bin/usb-export-logs.sh

Add the following code to the script:

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#!/bin/bash

MOUNT_POINT="/media/usb"
LOG_SOURCE="/var/log"
EXPORT_FILE="production_log_$(date +'%Y%m%d_%H%M%S').csv"

# Create the mount point if it doesn't exist
[ ! -d $MOUNT_POINT ] && mkdir -p $MOUNT_POINT

# Mount the USB drive
mount $1 $MOUNT_POINT

# Copy logs or export CSV
if [ -d $MOUNT_POINT ]; then
    tar -czf $MOUNT_POINT/$EXPORT_FILE -C $LOG_SOURCE .
    echo "Logs exported to $MOUNT_POINT/$EXPORT_FILE"
else
    echo "Error: Unable to mount the USB drive!"
fi

# Optionally, unmount the USB drive
umount $MOUNT_POINT

Make the script executable:

Code: Select all

chmod +x /usr/local/bin/usb-export-logs.sh

3. Test the Setup

Insert a USB drive into the Raspberry Pi.

The script should automatically mount the drive, copy the logs, and optionally unmount it.

Check the USB drive for the exported logs.

Posted: **18 Dec 2024, 10:51**

You should try an automatic way to update USB driver.

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