PEAK_DETECT_AVAILABLE_DEVICES

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Detects available PCAN devices and returns a string containing the device name and the channel number. This blocks is use to detect available PCAN devices and returns a string containing the device name and the channel number. → Use the channel number to configure to connect to PEAK can hardware and other devices that support the PCAN interface using the PCAN_CONNECT block. For Windows and Linux compatibilities, the following Drviers are required: → https://www.peak-system.com/Drivers.523.0.html?&L=1 For MacOS compatibilities, the following Drivers are required: → https://mac-can.github.io/ Params: None : Returns: out : String A string containing the device name and the channel number.

Python Code

from flojoy import flojoy, String, DataContainer
import can
from typing import Optional


@flojoy(deps={"python-can": "4.3.1", "uptime": "3.0.1"})
def PEAK_DETECT_AVAILABLE_DEVICES(default: Optional[DataContainer]) -> String:
    """Detects available PCAN devices and returns a string containing the device name and the channel number.

    This blocks is use to detect available PCAN devices and returns a string containing the device name and the channel number.
    → Use the channel number to configure to connect to PEAK can hardware and other devices that support the PCAN interface using the PCAN_CONNECT block.

    For Windows and Linux compatibilities, the following Drviers are required:
        → https://www.peak-system.com/Drivers.523.0.html?&L=1
    For MacOS compatibilities, the following Drivers are required:
        → https://mac-can.github.io/

    Parameters
    ----------
    None

    Returns
    -------
    String
        A string containing the device name and the channel number.
    """
    available_channels = can.detect_available_configs("pcan")

    str_builder = ""
    for channel in available_channels:
        str_builder += f"{channel['device_name']}: {channel['channel']}\n"

    if str_builder == "":
        raise Exception(
            "No device available detected. Please make sure that the PCAN drivers are installed."
        )

    return String(str_builder)

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Example App

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This application demonstrates how to use multiple CAN blocks to connect to a PEAK-USB device and read messages from it. The PEAK-USB device is a USB-to-CAN interface that enables you to connect a computer to a CAN network. This device is used in this case to capture the messages of a particular sensor by filtering them directly at the kernel level, thus reducing the load on the CPU, and save those messages to a log file locally.

Once the app is done, the generated logs are exported to an S3 bucket to keep a record of the sensor’s data for further analysis.

To replicate this application, you must connect the PEAK-USB to your computer and install the required driver (refer to the PEAK_CONNECT blocks for more information on the necessary driver for your platform). Then, simply specify the PEAK-USB channel in the required blocks, and this Flojoy application will log the messages received by the device!

Detecting channels A valuable block is the PEAK_DETECT_AVAILABLE_DEVICE. This block allows you to display the devices using the PCAN interface that are connected to your computer.