PEAK_CONNECT
Python Code
from flojoy import flojoy, DataContainer, DeviceConnectionManager, HardwareDevice
from typing import Optional
import can
@flojoy(deps={"python-can": "4.3.1", "uptime": "3.0.1"})
def PEAK_CONNECT(
PCAN_address: str, bitrate: int = 500000, default: Optional[DataContainer] = None
) -> Optional[DataContainer]:
"""Connect to a PCAN device.
Connect to a PCAN device. This blocks should be compatible with all devices that support the PCAN interface.
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
----------
PCAN_address : str
The PCAN device address to connect to. This address can be found by the PCAN_DETECT_AVAILABLE_DEVICES block.
→ Example: "PCAN_USBBUS1"
bitrate : int
The bitrate of the PCAN device. Default is 500000.
Returns
-------
DataContainer
Optional: None
"""
session = can.interface.Bus(interface="pcan", channel=PCAN_address, bitrate=bitrate)
DeviceConnectionManager.register_connection(
HardwareDevice(PCAN_address),
session,
cleanup=lambda pcan_bus: pcan_bus.shutdown(),
)
return None
Example App
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.