Live data visualization
In the last recipe of the chapter, we are going to improve the previous recipe by adding a refresh feature to the project, so that the graph is refreshed as new data comes in. This will avoid having to constantly refresh the page.
Getting ready
Make sure that you have carried out and tested the previous recipe, as we are going to improve it. Of course, as usual, you will find the whole code inside the GitHub repository of the book.
How to do it...
Here, we are going to improve the code from the previous recipe in order to measure data and display it on the graph.
First, we need to add some code to the app.js file in order to make measurements and write them into the database.
This is done with the following piece of code:
app.get('/make_measurement', function (req, res) {
// Prepare request to Galileo server
request_options = {
url: 'http://192.168.1.103:3000/api/analog/read?pin=0',
json: true
}
// Make request to Galileo server
request...