About this courseInternet of thing is everywhere. Reading and visualisation of temperature data is a good example to help us understand the world of IoT. It is easy to implement and you can find out more interesting user scenario anytime if you want. As NodeMCU LoLin contains a WIFImodes, we can publish temperature to remote server, which means when you finish this course, you are able to send the temperature data to everywhere you want. As the IoT hardware in this course are powered by Battery, it also means you can get the temperature data from everywhere, what you need is a WiFi Hotspot (or from SmartPhone).Actually we can just connect NodeMCU LoLin directly to temperature sensor DHT22, get temperature data from it and then publish it to a remote Raspberry Pi. But in this course, i just wanna show you how to use an Arduino UNO in between. One reason is: With this solution you have more free pins. For the future, if you wanna connect more IoT Hardwares to NodeMCU LoLin, the IoT infrastructure has already been good prepared by this project. In this course you will learn HardwareConnect IoT hardware components so that they can work toghter. Power up IoT hardware. SoftwareHow to get temperature data from a temperature sensor DHT22. How to forward temperature data from sensor to Arduino UNO. How to connect Arduino UNOand NodeMCU LoLin by using Breadboard. How to forward temperature data from Arduino UNO to NodeMCU LoLin. How to transmit temperature data from NodeMCU LoLin to remote Raspberry Pi via MQTTMessage. Development EnvironmentSetup Development environment using Arduino IDE and Visual Studio Code. Programming and Upload code from laptop to Arduino Uno and NodeMCU LoLin. Production EnvironmentUse Battery supply for IoT Hardware so that you can take your IoT Hardware everywhere.