How do I transfer data from firebase to Arduino?

How to Fetch Data From a Firebase Database on NodeMCU

Go to Tools > Board and select ESP32 Dev Module. Next, go to Tools > Port and select the appropriate port through which your board is connected. Click on the upload button to upload the code to your ESP32 development board. After you have uploaded your code to the development board, press its ENABLE button.

limitToFirst method returns the specified number of items beginning from the first one. limitToLast method returns a specified number of items beginning from the last one .

You can use the ESP32 to connect and interact with your Firebase project , and you can create applications to control the ESP32 via Firebase from anywhere in the world.