IJARCCE ISSN (Online) 2278-1021 ISSN (Print) 2319 5940 International Journal of Advanced Research in Computer and Communication Engineering ISO 3297:2007 Certified Vol. 5, Issue 8, August 2016 Copyright to IJARCCE DOI 10.17148/IJARCCE.2016.5848 257 Survey on Energy Efficient Protocols and Challenges in IOT Syeda Butool Fatima 1 , Sayyada Fahmeeda Sultana 2 , Sadiya Ansari 3 Assistant Professor, E&CE Dept, Khaja Banda Nawaz College of Engineering, Karnataka, India 1 Assistant Professor, CS Dept, PDA College of Engineering, Karnataka, India 2 Assistant Professor, CS Dept, Khaja Banda Nawaz College of Engineering, Karnataka, India 3 Abstract: Internet of things (IoT) connects everything for communication making smart cites, smart home etc with IoT. it is embedded with various technologies WSN wireless sensor networks one such technology play important role in IoT, sensors with limited power as battery backup problem of IoT. In this paper we survey of different challenges and energy efficient protocol that make IoT energy efficient. Keywords: Internet of things (IoT), wireless sensor network (WSN), battery backup, Energy efficient. I. INTRODUCTION Internet of things Internet of Things in general ability of network devices to sense and collect data from the world around us, and then share that data across the Internet where it can be processed and utilized for various interesting purposes. The large-scale implementation of IoT devices promises to transform many aspects of the way we live. For consumers, new IoT products like home automation components smart home [1], smart cities etc. Other personal IoT devices like wearable fitness and health monitoring devices and network enabled medical devices are transforming the way healthcare services are delivered. Some observer sees IoT connecting everything “smart” world. While other warns IoT taking towards dark world surveillance, privacy and security violations, and consumer lock–in. In fact, one of the most important elements in the IoT is wireless sensor networks (WSN). That helps in connecting both WSN and other IoT elements go beyond remote access, as heterogeneous information systems can be able to collaborate and provide common services [2]. The idea of internet of things (IoT) was developed in parallel to WSNs. Internet of things was devised by Kevin Ashton in 1999 [3] and refers to uniquely identifiable objects and their virtual representations in an “internet -like” structure. IoT and WSN are base technology areas for ongoing and emerging standardization areas by the IEC (International Standards and Conformity Assessment services to solve global problems in electro technology) like smart grid, industry and smart cities, it is important for IEC to have a good understanding of them, the standardization environment and the specific needs [4]. Supplying power to these IoT devices and their network connections can be expensive and logistically difficult. Portable devices require batteries that someday must be replaced. Although many mobile devices are optimized for lower power usage, energy costs to keep potentially billions of them running remains high. In this paper survey on different energy efficient protocol use in IoT and some of the challenges face by IoT. II. CHALLENGES An easy way to Internet of things (IoT) communications of things with internet such as making everything smart, smart cities, smart home ,offices fig.1 etc. With the rapid technological development of sensors, WSNs will become the key technology for IoT. As we all know to connect things needs sensors to sense and collect data that data is send for further processing through internet. Major problem in IoT, sensors battery backup which helps to route the data. Intermittent connectivity [7] Due to the limited battery life, there is always a danger of change in the network topology. Intermittent connectivity can also be experienced due to the highly mobile devices, which get disconnected from the network when they move. As IoT in future everywhere connecting everything its network also become vast everywhere deployment of IoT which will be embedded in devices. Under such situation lack of energy backup will affect communication stops as soon as battery over. Most of the devices use in IoT are multi-hop communication are low powered devices they uses relay for transmission of data from source to destination. It is use for load balancing. If keep topology reconfiguration in control. Also use to increase fault tolerance, reliability, QOS Another challenge in IoT is connecting all technologies use in IoT together such as WSN, network, WiFi, zigbee all together using common standard protocol. Heterogeneity is in IoT Scalability as IoT use wireless sensors for communication .therefore its network some time get large some time reduce .it is also an effect the routing