The C.H.I.P. computer from Next Thing Co. has many IO ports, features, and expansion capabilities. It also has a status LED that can be controlled via software. That means that the LED can be made to blink.
fordsfords wrote a much better version of a blink utility: it can use different control buses and even has a feature to flash differently depending on the current battery level.
To go above and beyond, fordsfords has an example in both C and bash. But I don't like writing in C or bash. So this is one in ruby.
You need to install ruby on your C.H.I.P. I'm too daring to use an unprivileged user so all commands below are for root. Adjust to taste.
At the time of writing, the current version of ruby is 2.3.1. Also, adjust to taste.
Install build dependencies.
Not all of these are needed but I expect to want some of them later so I'm throwing them all in for now. Adjust to taste.
apt-get -y install wget curl build-essential zlib1g-dev libssl-dev libreadline-gplv2-dev libxml2-dev libsqlite3-dev libffi6 libffi-dev
tar -xvf ruby-2.3.1.tar.gz cd ruby-2.3.1
./configure && make && make install
gem install daemons
Unfortunately, the current version of this library (0.0.5) does not support forcing commands over the i2c bus. This is a requirement for controlling the LED.
This feature has been merged into the library; but until a new version is published, you'll need to build the code.
apt-get -y install git
Clone the current i2c-devices code
cd git clone https://github.com/cho45/ruby-i2c-devices.git
Build and install the development version of the gem
cd ruby-i2c-devices gem build i2c-devices.gemspec gem install --local i2c-devices-0.0.5.gem
Get the code
You could download the code directly from github; but you have git installed so why not use it?
cd git clone https://github.com/willia4/chip-blink-ruby.git
Install the script
cp chip-blink-ruby/blink.rb /usr/local/bin chmod 755 /usr/local/bin/blink.rb
Install the service
cp chip-blink-ruby/blink.service /etc/systemd/system/blink.service systemctl enable /etc/systemd/system/blink.service
Start the service
service blink start
Stop the service
service blink stop
Thanks again to fordsfords for writing the code that I was able to copy.