Use fairy lights and a Raspberry Pi to make a beacon that flashes every time a hashtag is ’’ll need to put into your Raspberry Pi to get the action started: http://bit.ly/TwiBeacon In this year’s CHRISTMAS LECTURES electrical and electronics engineer, Prof Danielle George will take three great British inventions - a light bulb, a telephone and a motor - and show you how to adapt them and transform them to do extraordinary things. This is tinkering for the 21st century, using the full array of cutting edge devices that we can lay our hands on: 3D printers, new materials, online collaboration and controlling devices through coding. Find out more here: http://rigb.org/christmas-lectures/sparks-will-fly/about-sparks-will-fly Special thanks to Raspberry Pi for their support with this year’s Lectures The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter