This is the 4th and final part of the Ethereum IOT Kid Grounding Device project. In this part, I will focus on describing the process of putting together the PIR sensor to write to the Ethereum Blockchain whenever the kid moves. I will also discuss my thoughts behind this project, explaining where it is lacking and how I could make it better in its next iteration.

You may read part 1 here,  part 2 here and part 3 here.

This is part 3 of my Ethereum IOT Kid Ground Device project. In this part, we will discuss the codes of the web service backend written in Node.js and running as a server application. You may read part 1 here and part 2 here.

This is part 2 of my Ethereum IOT Kid Grounding Device project. In this part, we will discuss the business logic behind Grounder.sol, the Smart Contract that does the real work behind grounding my kid. You may read part 1 here.

I like to equate Smart Contract to the business logic layer of conventional apps which developers would have developed as JSON web services in tools such as node.js (if you like JavaScript) or django (if you like Python).

Internet of Trusted Things (IOTT) is a recently-coined term that explores the integration of Internet of Things (IOT) with Blockchain.

In this part, I will develop a Cordova mobile app to display the message received from the Sigfox network on my mobile device.

What have we done so far?

In part 1, I developed the Zoe Helper hardware, a button that sends a Sigfox message to the Sigfox backend, and through a callback, route the message to jacksonn.org.

In this part of the project, I process the message sent by Sigfox Backend via callback. To recap, this is the message:

http://jacksonng.org/sigfox/newnotifications.php?message={data}&deviceid={device}

The job of newnotifications.php is to read the message, check who it is intended for, and send the message to the receiver's mobile device. 

Whose message is this?

In this project, I will hook up a button to my Arudino UNO. When the button is pressed, it will send a message through the Sigfox backend to my virtual server, and then finally as a notification to my mobile phone. 

Objective