This module https://github.com/garethr/garethr-docker lets you install and control Docker using Puppet.

For example this Vagrant setup spins up an Ubuntu VM and then using the Docker module spins up a Jenkins build server Docker container with a few simple commands;

include docker
docker::image { 'jenkins': }
docker::run { ‘some-jenkins’:
image => ‘jenkins’,
ports => ‘8080:8080’,
volumes => ‘/vagrant/jenkins’,
use_name => true,
}

Doodle’s Geek Monkey by Alastair Montgomery

Minimal 3x5 numeric font on a LCD Matrix for Arduino Nano.

Doodle’s Geek Monkey by Alastair Montgomery

Testing a LCD Max7219 Matrix with an Arduino Nano, thank to http://tronixstuff.com/2013/10/11/tutorial-arduino-max7219-led-display-driver-ic/

#include <LedControl.h>
LedControl lc=LedControl(12,11,10,1);
// pin 12 is connected to the MAX7219 pin 1
// pin 11 is connected to the CLK pin 13
// pin 10 is connected to LOAD pin 12
// 1 as we are only using 1 MAX7219
void setup(){
  lc.shutdown(0,false);
  lc.setIntensity(0,8);
  lc.clearDisplay(0);
}