What is a Wireless Sensor Network? (2020) | Learn Technology in 5 Minutes

Hello and Welcome to another episode of “Learn Technology in 5 Minutes” from MAKERDEMY.

In this episode, we will learn about Wireless Sensor Networks and why they are often an important part of an IoT solution. When we want to rapidly prototype IoT solutions, we often use Raspberry Pi, the ESP32 or even the Arduino. This is all fine for prototyping, but real-world deployment is a different ball game altogether. In the real world, there are a variety of constraints. We have constrained networks, we have cost constraints, we may have to make our solution work in harsh environments and so on.

For example, let us consider a smart city project. Such a project may involve deploying several thousands of sensors all over a city spanning an area of several hundred square kilometers. Often, these sensors will have to run on batteries with minimal or zero human assistance. Furthermore, the radio network may have bandwidth and quality constraints. And the project will also most likely have budget constraints.

This is where the Wireless Sensor Networks come in to play. A wireless sensor network comprises a large number of sensor nodes arranged in a variety of topographical configurations like the star, ring, and mesh. These sensor nodes are usually battery or solar operated and are designed to operate on very little power. Often the radio transmission range of these sensor nodes is a few tens of meters, so the network nodes will have to relay the data from sensors all the way to the gateway from where the data can be sent to the cloud via either wired ethernet, cellular or wifi networks. Thus, the data in a wireless sensor network takes a multi-hop path to reach the sink node or the base station.

And what are the benefits of have this sensor network wireless? Well, to start with it is a lot cheaper to build a wireless network rather than wiring up all the sensor nodes. Secondly, with wireless, the sensor network can be configured and reconfigured into various topographies like mesh, star, etc. very easily. Sensor nodes can also be added to and removed from a wireless network a lot easier than a wired network.

Now let us see what are the components of a typical wireless sensor node. The sensor is just one component of a wireless sensor node. Usually, it also has a power supply, a microcontroller, and a radio transceiver.

Put simply, all this data from various sensors in the wireless sensor network, take a multi-hop route to the base station or gateway from where the data is funneled to the cloud IoT platforms like AWS IoT where all this data is cleaned, and analyzed to come with actionable insights.

Typical sensor nodes are used to measure temperature, humidity, vibrations, light, heat, movement, moisture and so on.


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#WirelessSensorNetwork #WSN #Sensor
divya dharshini : good one ,sir...!!!
MAKERDEMY : Check out the "Learn Technology in 5 Minutes" video playlist
https://www.youtube.com/playlist?list=PLZPR_hmBy0cz75sWkojLbt8KrfC3UkPdJ
Abdo Idris : Hi everyone how can get date set of the wireless sensor network, please?
محےمد علیے : Hi, can I get this slides please ?
MAKERDEMY : Many thanks

【TOSHIBA】Wireless sensor network

Toshiba’s technology enables sensor networks to watch over people and society.：「Wireless sensor network」

D1mini ESP8266과 mosquitto를 이용한 Wifi 무선센서네트워크 [김동일교수 두원공과대학교 메카트로닉스] 1-15

Di mini ESP8266 2개를 iPtime Wifi 무선 네트워크를 사용해 PC의 Mosquitto에 연결하여 센서네트워크를 구성한다.
아두이노 소스프로그램 :https://github.com/kdi6033/arduino/tree/master/1-15_Mqtt/mosquittoOut
김무수 : 김동일교수님 어제 질문에 빠른 답글 감사합니다. 지금까지는 잘 따라 왔는데, 이 동영상 강의에서 막혀서 질문드립니다.
ESP8266 mIni 2개의 USB 연결은 어디에 하는지 잘 몰라 문의 드립니다
저는 노트북에 2개의 ESP mini를 2개의 USB 연결 포트에 연결하니까, 포트가 1개 밖에 나오질 않아 uploading을 시킬 수가 없네요.
혹시 2대의 컴퓨터로 하셨는지요?
kim Hee jin : PC에서 mosquitto를 설치하고 DOS 기반에서 통신이 되는 것을 확인했습니다. 그런데 아두이노에서는 mqtt_server = "broker.mqtt-dashboard.com"로 해야 통신이 되는 것 같습니다.
1. 사전에 pc에서 mosquitto를 실행시키고 해야 합니까? 그러면 어떻게 실행시깁니까?
2."broker.mqtt-dashboard.com"과 PC mosquitto에서 사용하는데 차이는 무엇입니까?
3. serial 모니터 두개가 동시에 올라오지 않네요...보드 1은 Di mini이고 , 보드2는 esp-12f인데 포트가 Sillicon Labs CP210x USB to UART Bridge(Com6)로 잡힙니다. D1 mini가 하나 밖에 없고. esp-12f는 여러개를 가지고 있습니다. 원인이 여기에 있을까요?
김무수 :  @김동일  답변 감사합니다. D1 mini 한개는 그렇게 해서 교수님 강의를 따라하고 있었는데, 2개의 D1 mini를 연결해도 포토 번호가 하나맊에 나오질 않네요. 그럼 제 컴퓨터가 이상한지확인해 보겠습니다. 감사합니다!!
김무수 : 김동일 친절한 답변 감사합니다. 가르쳐 주신 방법으로 제 컴퓨터를 점검해 보겠습니다.
김무수 :  @김동일  교수님의 말씀 듣고 전자상가 가서 데이터케이블 구매후 ESP8266간 mosquitto를 이용 wifi 통신이 해보니 잘 되네요. 감사합니다!!!

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