• Micro USB 2.0
  • D-Sub 9
  • STM32F07
  • Native socketcan support
  • RX/TX Status LED

The candleLight is a low price Open Hardware (CERN OHL) USB to CAN adapter. Like a network card, the candleLight allows to equip a computer with a CAN bus and to communicate via the CAN protocol.

New: This device is also available as candleLight FD in a version with support for CAN-FD.

The candleLight not only fits in any pocket and enables any developer to set up a CAN remote station even when on the road, it is above all an important building block for a reliable test infrastructure:

  • Unlocked Bootloader to use your own Firmware
  • Open Hardware & Open Software
  • Long-Term Availability
  • Runs native on Linux and Raspberry Pi OS

The LXA-IOBus universe is based on the CAN bus infrastructure in order to have a stable communication channel to and between the "devices under test".

Assemble the Hardware

The candleLight will be supplied as a kit. For full functionality, the D-SUB 9 connector must be soldered to the contacts. To protect the PCBA a heat shrink tube is also supplied. (The work should only be carried out by trained and instructed persons).

First Steps

The candleLight adapter is supported from Linux kernel version v3.6. The associated CAN driver is CONFIG_CAN_GS_USB "Geschwister Schneider UG interfaces".

This driver is included on all modern Linux distributions, such as Debian, Ubuntu or Raspberry Pi OS.

Just plug the device in and check for a new network device using the ip tool:

pi@raspberrypi:~ $ ip a s can0
5: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10

Before we can connect it to a CAN bus, we must configure the bitrate that's used on the bus. The bus in the example uses 500 kbit/s:

pi@raspberrypi:~ $ sudo ip link set dev can0 up type can bitrate 500000

You are now ready to use the candeLight with every software that can use the Linux socketcan-interface. For low level access to the bus:

  • cansend to send arbitrary frames
  • candump to log frames and status information into a terminal
  • wireshark for deep, graphical protocol analysis

Our Commitment to Quality

This device is manufactured in Germany. Each device is put into operation and tested by hand by Linux Automation.