In the previous article we connected Arduino UNO with ESP8266-01 and tried various AT commands to create an Access Point, making a connection to a Wifi Network, listening to the TCP port and passing message back and forth with AT commands. That was all basic tasting water, in the post we will step up the game and we will read sensor data from Arduino and send it to a central server and then will display that sensor data on the mobile client.

For the purpose of demonstration, we will use DHT11 temperature and humidity sensor and will send temperature and humidity data to the central server. For the server and mobile client, we will use Blynk which is has a server which collects sensor data from various devices and there is also Blynk mobile client which you can create a dashboard with drag and drop interface and play around with visualization of the sensor data.

If you ever heard of internet of a thing and have been fascinated by its possibilities and its promises then I am sure you must have heard of Arduino development boards. Arduino is a great piece of hardware to do some quick hardware prototyping and when you are confident with the prototype you go a step further and build more of these devices and make them work for you to do some sort of automation. Adding Wireless capability to Arduino projects will even make it more easy to install/use. In this post, I will connect the ESP8266 chip to Arduino Uno. We will see how we can create Access Point and connect to wireless networks. ESP8266 is a low-cost alternative to Arduino WiFi shield.