Wiring Diagram

The following diagrams help you wire the NodeMCU board with parts, to work with both examples of Play a Tune and Send to IoTCS.

The pin connection: Button(GND, D2), and Piezo buzzer (GND, D6).

Note: for the button, you just pull two legs from one side and straighten them out, so you can connect them with the jumper wire to GND and D2 pins.

A close-up view of button legs, and how to use the button

And here is an example of actual wiring