Frustrated with an inability to find a cost-effective karaoke machine with enough useful features to make it workable, Harry Gonzalez-Rivera decided to take a cheaper karaoke machine and cram a Raspberry Pi Zero inside. He added a USB audio card and wi-fi adapter, as well as a small hub, to create connectivity and all he needed to do then was to plug the HDMI cable and microphone in. You can read more about the system over at The MagPi and you can view the code behind it here.