Visual heartbeat for a Raspberry Pi or other small headless Linux system.
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ledflash is a simple daemon which will switch an indicator LED on a small Linux computer (e.g. a Raspberry Pi running Raspbian) off or on every three seconds. This lets you immediately tell if a headless device has crashed. It's a small program, written in C so as to not consume a lot of system resources.

ledflash will work fine on any computer that implements the Linux LED interface, provided you have defined the constant 'FLASHFILE' to point to the correct LED control file. It was originally written to work on a Pogoplug that had been upgraded to run Debian.

Building and Installing

To build ledflash:

  1. Install gcc and the basic dev libraries.

  2. Install perl (the manual is in perldoc).

  3. Clone the source tree and cd to it.

  4. Edit the Makefile to define the correct 'PLATFORM' value. If your platform isn't supported, it's pretty straightforward to add it in ledflash.c.

  5. Do a 'make && sudo make install'.

  6. Frantically review the Makefile to ensure that I didn't just trick you into running an exploit as root. Revise as necessary, then repeat the previous step.

  7. Do a 'sudo ledflash' to start the service.

  8. Add 'ledflash' to /etc/rc.local to start the service at boot time.

Other Stuff

Copyright (C) 2012-2016 Chris Reuter, GPLv2, NO WARRANTY!