What if you could make your very own digital, Internet-connected piano? It can be a bit complicated, but it's your lucky day! We'll teach you how to make one in just a few steps.

It's actually very simple. We will use a NodeMcu connected to the cloud (Ubidots) and we'll establish the musical notes. We'll also create buttons in Ubidotsreplacing the standard piano keys. So, let's make the music sound!

Step 1: Overview

In this post you will learn how to use the NodeMcu with a Buzzer + Ubidots. NodeMcu is IoT device with GPIO, PWM, IIC, 1-Wire and ADC all in one board, and it has connection via Wi-Fi. Is easy to use and you just need the Arduino IDE to learn to program it.

Step 2: Requirements

First, you need the following:

NodeMcu version 1.0
Grove Base Shield for NodeMcu
Grove Buzzer
UbidotsESPMQTT library
Ubidots account

Step 3: Setup

1. First, couple the NodeMcu to its base shield and then make the connection of the buzzer to pin D1.

2. Go to the Arduino IDE, click on Files -> Preferences and enter http://arduino.esp8266.com/stable/package_esp8266... into the "Additional Board Manager URLs" field. You can add multiple URLs, separating them with commas.

3. Open "Boards Manager" from Tools -> Board menu and install esp8266 platform. Don’t forget to select your NodeMCU 1.0 board from Tools > Board menu after installation.

4. Download the UbidotsESPMQTT library if you haven't already. Now, click on Sketch -> Include Library -> Add .ZIP Library

5. Select the .ZIP file of Ubidots ESPMQTT and then “Accept” or “Choose” for all the libraries. If you can't add the library, try manually; unzip the downloaded rar / zip and copy the folder from the library to the path C:\Users\ubidots\Documents\Arduino\libraries

6. Close the Arduino IDE and open it again.

Step 4: Setting Up Ubidots

1. Add a new Data Source called "piano".

2. Add a new Variable for each musical note. Start with a variable called "do", and then "re", "mi", "fa", "sol", "la", "ti".

3. Verify that the label of the Data Source and the Variables are the same as the name. This allows the communication between Ubidots and the NodeMcu.

4.Create the buttons/switches that allow you to play each musical note. To do this, go to Dashboard and in the upper right of the page click Add widget. Select Control > Switch > piano (data source) > do (variable) > finish. Don't forget do the same for each musical note.

Step 5: Program the ESP NodeMcu

Once everything is connected correctly, we will go to the IDE and write the following code.

https://gist.github.com/ubi-gists/7f67f1240e4e4480...

The next code is an example that show you how subscribe to a variable. If you want to use this example don’t forget to change TOKEN, WIFINAME and WIFIPASS.

Step 6: Results

And that's it! It's time to play de piano.

We've just shown you how to create a low-cost digital piano based on the Internet of Things (IoT), which by the way proves how apparently complex things can be done with the right tools and time.