 Welcome myself Mr. Vishal Angire and friends today we are going to see introduction to Bluetooth low energy. Learning outcome at the end of this session students will be able to explain Bluetooth low energy. While studying introduction to the Bluetooth low energy we have to cover these topics that is introduction to Bluetooth technology. Bluetooth technology have three different versions first one is base rate or enhanced data rate, high speed and low energy. So before starting introduction to Bluetooth technology a student should be aware of different communication technologies as well as we should know what is mean by Bluetooth. Now we will see introduction to Bluetooth technology. Physical data link layer uses wire or wireless communication technologies. For example Bluetooth NMC that is near field communication RFID, ZigBee etc. So Bluetooth devices follow IEEE 802.15.1 standard protocol for physical come data link layer. Bluetooth devices form WPAN that is wireless personal area network devices network. So generally the use of this Bluetooth technology is for IoT that is internet of things. In internet of things the devices or digital gadgets are to be connected or interconnected with each other they can send, receive data or communicate with each other with the help of internet and in that case it is required to use communication technologies like Bluetooth NFC RFID or ZigBee. So from that now we are studying Bluetooth technology that how this Bluetooth technology is helpful for communication between two devices which we are going to use in internet of things. Now we will see Bluetooth technology evaluation. Actually Bluetooth technology is to be designed at 2007 means before this the Bluetooth is invented at 1998 and after that there are different versions are to be evaluated. In 2007 version 2.1 which is called as secure simple pairing in which it allows secure device pairing with a button press numeric compare and out of band. So in this basic version just we have to push the button or we have to press the button and after that the pairing is to be done between two devices and just a simple authentication is to be done and after that two devices are to be paired and both those devices can send or receive data or communicate between each other. In 2009 next version is to be designed and that is version 3.0 which is also called as high speed which enables application to use 802.11 standard through addition of generic alternate. Next in 2010 next version is designed which is called as version 4.0 it is called as low energy Bluetooth low energy which enables new application in different markets include healthcare, sports, fitness, security, home entertainment. So in this latest version that is version 4.0 that is Bluetooth low energy which is to be invented in 2010 is to be used for low power consumption. So generally Bluetooth low energy that is version 4.0 is to be used in healthcare products, sports, fitness, security or home entertainment. As an example we can see today's smartwatches in which they will provide different functionalities through which will get a heart rate or calories which are to be burned for a particular person and all this data are to be recorded in that smartwatch and that data you can see in your smart phone with the help of that Bluetooth low energy. So we can consider these two devices that is one is smart phone and another is smart watch. So that smart watch and smart phone both are to be connected with the help of Bluetooth and data present in that smartwatch is to be sent on smart phone. So you can keep track of your health with the help of these gadgets as well as applications and communication between these two devices or sending and receiving of the data is to be done with the help of Bluetooth low energy. So this is evaluation of Bluetooth technology. Next we are going to see the technologies or specification or configurations of these two different variants of Bluetooth. So one variant is Bluetooth BR, EDR or HS that is basic rate, enhanced data rate or high speed technology and another is Bluetooth low energy technology. So first is radio frequency range. The radio frequency range for both the variants is 2.4 GHz. Next range for Bluetooth BR, EDR or HS is 10 to 100 meters and for Bluetooth low energy it is 10 to 100 plus the range is to be extended in meters. Next is data rate, data rate for Bluetooth basic rate or enhanced data rate or HS that is high speed is from 1 to 3 mvps and for Bluetooth low energy it is 1 mvps. Notes or active slayers means how many devices can be paired with this Bluetooth. So for basic rate it is up to 7 and for EDR it is 1677184 and in case of Bluetooth low energy technology you can connect many billions of devices and the range or the number of devices you can connect in Bluetooth low energy is up to 2.1 billion. Next security so in case of basic rate it is 56BE0 means 56 bits E0 as well as 128 bits AES and application layer user defined and in case of Bluetooth low energy technology it is 128 bits AES and application layer user defined. Latency is 100 ms in case of Bluetooth basic rate or EDR that is enhanced data rate or high speed and in case of Bluetooth low energy it is less than 3 ms. Regulatory acceptance is worldwide for both the variants of Bluetooth technology. Voice capability is available in Bluetooth BR, EDR, HS technology that is basic rate, enhanced data rate or high speed and it is not available in Bluetooth low energy means with the help of Bluetooth we can play the music in case of BR, EDR or HS but that functionality is not available in Bluetooth low energy. For example for this voice capability functionality you can play the music on your smartphone and that music will be played or through speakers you can enjoy the music but this feature is not available in this new version that is Bluetooth low energy. Power topology so scatenate topology is to be used in first variant that is Bluetooth BR, EDR or HS technology and starburst topology is to be used in Bluetooth low energy technology. Power consumption so power consumption is 1 unit in case of first variant and it is from 0.01 to 0.5 in case of Bluetooth low energy technology. Service discovery is available in both the variants of this Bluetooth technology. Now we will see Bluetooth technology block diagram so in middle it is BR, EDR at the left of this it is AMP and the right of this is low energy. So in next lecture we are going to see in detail of this Bluetooth technology block diagram so there are different physical layers in case of BR, EDR as well as low energy variant of Bluetooth technology. So in case of BR basic rate it is physical layer as well as MAC layer and another layer is to be used and for low energy it is low energy link layer as well as low energy physical layer and there are different profiles as well as protocols in case of basic rate enhanced data rate as well as there are different profiles as well as protocols in case of Bluetooth low energy technology. So in next lecture we are going to see these different profiles as well as protocols for these two different variants of Bluetooth technology. While preparing this video lecture I have used Internet of Things, Architecture and Design Principles by Raj Kamal. Thank you.