From the OPTA docs "Additionally and using a USB memory stick, the USB-C® connector can be used for data logging
purposes or to update the program inside the PLC."
I've tried extensively with the USBHost library and cannot get the OPTA to read or even power a memory stick (OPTA powered externally).
The USBHost function 'supplyPowerOnVBUS' does not seem to have any effect.
Does anyone have an examples of this working?
Hi @tmbkr
A new tutorial on USB data logging with Arduino Opta will be released soon on Arduino Docs.
Stay tuned!
Best,
Hello!
Such an OPTA PLC will arrive soon, to which it would be important to connect a USB data carrier. Where can I get the required library?
take a look here: Introducing Arduino's new storage libraries: Streamline data management for your projects | Arduino Blog
Example for OPTA: https://github.com/arduino-libraries/Arduino_USBHostMbed5/blob/main/examples/OptaDirList/OptaDirList.ino
For anyone who's interessted.
I used this code on an Arduino Opta RS485
/*
SimpleStorageWriteRead
Demonstrates basic usage of the "Arduino_UnifiedStorage" library to write and read data to storage.
Supports SD card, USB storage, and internal storage (default, uncomment to choose).
In the setup function, the code initializes serial communication, mounts the storage medium,
creates a root directory with three subdirectories, and writes data to three files in each subdirectory.
Following this, the code showcases reading data from files by using "seek" and "available" methods,
switching file modes to read, resetting file pointers to the start,
and printing the read data to the serial monitor using a while loop.
INSTRUCTIONS
1. Check compatibility with your board and make sure you have "POSIXStorage" and "Arduino_UnifiedStorage" installed
2. Connect your board to the serial monitor
3. Wait for the sketch to run
Created 28th July 2023
By Cristian Dragomir
Modified 24th August 2023
By Ali Jahangiri
https://github.com/arduino-libraries/Arduino_UnifiedStorage/blob/main/examples/SimpleStorageWriteRead/SimpleStorageWriteRead.ino
*/
#define ARDUINO_UNIFIED_STORAGE_DEBUG
#include "Arduino_UnifiedStorage.h"
void printFolderContents(Folder dir, int indentation = 0) {
std::vector<Folder> directories = dir.getFolders();
std::vector<UFile> files = dir.getFiles();
// Print directories
for (Folder subdir : directories) {
for (int i = 0; i < indentation; i++) {
Arduino_UnifiedStorage::testPrint(" ");
}
Arduino_UnifiedStorage::testPrint("[D] ");
Arduino_UnifiedStorage::testPrint(subdir.getPath());
printFolderContents(subdir, indentation + 1);
}
// Print files
for (UFile file : files) {
for (int i = 0; i < indentation; i++) {
Arduino_UnifiedStorage::testPrint(" ");
}
Arduino_UnifiedStorage::testPrint("[F] ");
Arduino_UnifiedStorage::testPrint(file.getPath());
}
}
// Uncomment one of the three lines below to select between SD card, USB or internal storage
//SDStorage storage; // Create an instance for interacting with SD card storage
USBStorage storage; // Create an instance for interacting with USB storage
//InternalStorage storage;
void setup() {
beginRS485(115200);
// toggle this to enable debugging output
Arduino_UnifiedStorage::debuggingModeEnabled = true;
// storage = InternalStorage();
// storage = SDStorage(); // Uncomment this line to use SD card storage
storage = USBStorage(); // Uncomment this line to use USB storage
if(!storage.begin()){
Arduino_UnifiedStorage::testPrint("Error mounting storage device.");
}
// Create a root directory in storage device
Folder root = storage.getRootFolder();
// Create subdirectories inside the root directory
Folder subdir1 = root.createSubfolder("subdir1");
Folder subdir2 = root.createSubfolder("subdir2");
Folder subdir3 = root.createSubfolder("subdir3");
// Create .txt files inside the subdirectories
UFile file1 = subdir1.createFile("file1.txt", FileMode::WRITE);
UFile file2 = subdir2.createFile("file2.txt", FileMode::WRITE);
UFile file3 = subdir3.createFile("file3.txt", FileMode::WRITE);
// Write data to the files
file1.write("This is file 1.");
file2.write("This is file 2.");
file3.write("This is file 3.");
// Read data from the files using seek and available
Arduino_UnifiedStorage::testPrint("Reading data from files using seek and available:");
// Close and open files in reading mode
file1.changeMode(FileMode::READ);
file2.changeMode(FileMode::READ);
file3.changeMode(FileMode::READ);
// Read data from file1
file1.seek(0); // Move the file pointer to the beginning
while (file1.available()) {
char data = file1.read();
Arduino_UnifiedStorage::testPrint(String(data));
}
Arduino_UnifiedStorage::testPrint("");
// Read data from file2
file2.seek(0); // Move the file pointer to the beginning
while (file2.available()) {
char data = file2.read();
Arduino_UnifiedStorage::testPrint(String(data));
}
Arduino_UnifiedStorage::testPrint("");
// Read data from file3
file3.seek(0); // Move the file pointer to the beginning
while (file3.available()) {
char data = file3.read();
Arduino_UnifiedStorage::testPrint(String(data));
}
Arduino_UnifiedStorage::testPrint("");
printFolderContents(storage.getRootFolder());
}
void loop() {
//Flash LED to see that test finished
digitalWrite(LEDG, !digitalRead(LEDG));
delay(500);
}
USB Drive is attached via a USB A to USB C Adapater
i used RS-485 Interface to send debug messages.
Anyone else who already tried this?
Hello!
You can now access the new tutorial: "Using a USB Memory Stick for Data Logging on Opta™". Here is the tutorial link: https://docs.arduino.cc/tutorials/opta/usb-data-logging.
Hi, I have an OPTA Lite and just tried this sketch. I uploaded with the Arduino IDE and now I can't reprogram the Opta anymore through the USB port. How do I recover the OPTA?
Hello @gjt211
Double click the reset button of your Opta. The red led will start to blink
That means that Opta is now in bootloader mode, connect it to your arduino ide and upload whatever sketch you are interested into, that should work"