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Industrial Ethernet Book 103

PHOTO: WIKIMEDIA Hedy Lamarr, contemplating frequency-hopping spread spectrum technology Originally, Gaussian frequency-shift keying (GFSK) modulation was used, which limited the bandwidth to 1 Mbit/s. The introduction of Bluetooth 2.0 in 2004 allowed the use of differential quadrature phase shift keying, increasing the bandwidth to 3 Mbit/s. Different flavours With ongoing development, Bluetooth today comes in three different “flavours”. Classic Bluetooth, in Basic Rate or Enhanced Data Rate, is still the dominant cable replacement technology. It is what we all use for wireless keyboards, mice, speakers and headsets. Bluetooth Low Energy (LE), introduced in 2010, is optimised to use as little energy as possible. Powered by only a coin-sized battery, it can often last for years. Almost every smartphone or tablet today supports Bluetooth LE. The latest addition is Bluetooth mesh, which was launched this summer. It is intended to make the technology better suited for IoT applications. Classic Bluetooth is a star- topology in which all devices are connected to a central hub, which limits the network range to the furthest connected device. In the mesh network, all devices communicate with each other, which makes the area covered by the network almost unlimited. Beyond wireless speakers So what can Bluetooth do beyond connecting speakers or keyboards to our tablets and PCs? To find this out, the Bluetooth SIG organizes the annual Imagine Blue Awards. Designers develop solutions that push the boundaries of wireless connectivity. Here are some creative projects from the Imagine Blue competition. Bluejay After Sara Du got lost in the mountains, she developed the concept of Bluejay, a combination of software and hardware that is able to find missing people. Bluejay is a drone that uses an onboard Intel Edison computer and Bluetooth technology to communicate with both people in need of rescuing and rescuers. While cellular service may fail in such situations, Bluetooth would still function, so the drone could communicate with cell phones and facilitate rescues. PHOTO: SARA DU TrackR While we may not get lost at home, our car keys sometimes do. That’s where TrackR comes in. It creates a virtual floor plan of a users home and helps track frequently misplaced items. After attaching the coin-sized TrackR bravo to keys, wallet or phone, the TrackR app can locate it in seconds. One smart feature is that the app even helps you find items that you misplaced outside your home through a crowd-sourced network. When another TrackR user is within Bluetooth range of the lost item, the owner will receive a location update. Also, the app records the last known location on a map, so at least you know where to start searching. Novalia The Novalia project brings touch-based interactivity to virtually any printed material. Paper thin self adhesive touch sensors from printed conductive ink are combined with a microcontroller module that handles processing and Bluetooth communications. Touching the sensors controls apps on a smart phone or laptop. A single CR2016 coin cell powers the system for up to one year. Using this technology, Novalia created what the world had been waiting for a long time: The first playable pizza box DJ decks. The Pizza Hut boxes come in a design modelled on a modern DJ set-up. They feature two turntables, a cross-fader, pitch volumes, cue buttons and the ability to ‘rewind’ the music. The decks sync via Bluetooth to the user’s smartphone with DJ software such as Algoriddim’s DJAY Pro. The sound is produced from the smartphone or computer, which can be linked to external speakers. The DJ decks work by sensing human touch through conductive ink and can differentiate between taps, long presses and even swipes of the finger in any direction. This allows music and pizza fans to mix and scratch their own DJ sets by tapping and sliding their fingers over the controls. It’s really a shame that this was only a one-off promotion and limited to just a few of the Pizza Hut restaurants. Let us know if there is interest in a DJ-enabled edition of Industrial Ethernet Book magazine. Leopold Ploner Private Ethernet PHOTO: PIZZA HUT 51 industrial ethernet book 11.2017


Industrial Ethernet Book 103
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