A node-hid (USB HID device access library) wrapper for nodered
Credit goes to node-hid.
You can look up either git to find information on setup, Prerequisites and Platforms to get the node working: https://github.com/node-hid/node-hid
- Node.js v0.8 - v4.x+
- Mac OS X 10.8, Linux (kernel 2.6+), and Windows XP+
- libudev-dev, libusb-1.0-0-dev (if Linux, see Compile below)
- git
node-hid uses node-pre-gyp to store pre-built binary bundles, so usually no compiler is needed to install.
Platforms we pre-build binaries for:
- Mac OS X x64: v0.10, v0.12, v4.2.x
- Windows x64 & x86: v0.10, v0.12, v4.2.x
- Linux Debian/Ubuntu x64: v4.2.x
- Raspberry Pi arm: v4.2.x
This package works natively with Windows.
Manual installation is the current way to get the node. It will be added to the pallette manager in the future.
From github: Navigate to the your home directory on linux and windows it is typically ~/.node-red/node-modules
git clone https://github.com/gdziuba/node-red-contrib-usbhid.gitcd node-red-contrib-usbhid
npm installHID ( USB ) read/write access for non root users ( in my case for user pi on an raspberry pi 2 running nodered )
Install libraries for Linux
sudo apt install libusb-1.0-0 libusb-1.0-0-dev libudev-dev
The Pd-extended [hid] object allows you to access Human Interface Devices such as mice, keyboards, and joysticks. However, in most Linux distributions, these devices are setup to where they cannot be read/written directly by Pd unless you run it as root.
Running a non-system process as root is considered a security risk, so an alternative is to change the permissions of the input devices so that pd can read/write them.
sudo mkdir -p /etc/udev/rules.d
sudo nano /etc/udev/rules.d/85-pure-data.rules
Now add the following rules to /etc/udev/rules.d/85-pure-data.rules making sure to updated KERNEL to your hidraw* device:
SUBSYSTEM=="input", GROUP="input", MODE="0777"
SUBSYSTEM=="usb", MODE:="777", GROUP="input"
KERNEL=="hidraw<<put HID Number Here>>", MODE="0777", GROUP="input"
Example:
SUBSYSTEM=="input", GROUP="input", MODE="0777"
SUBSYSTEM=="usb", MODE:="777", GROUP="input"
KERNEL=="hidraw0", MODE="0777", GROUP="input"
Make sure no existing rules compete. I found existing file on Raspberry pi that needed updating. I added above code instead of creating a new file
Then create an "input" group and add yourself to it:
sudo groupadd -f input
sudo gpasswd -a $USER input
Reloads rules:
udevadm control --reload-rules
Reboot your machine for the rules to take effect. Your nodejs / nodered has now FULL ACCESS !! to you usb devides. Feel free to adjust the permissions to fit your needs.
Leverage this Flow to get started.
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