The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52.

This is a Example code for Sending Data from Arduino UNO to NodeMCU ESP8266 which then publishes the serial data to Firebase Realtime Database The API key in Firebase is the Web API key on the main ...

The first example plays the first audio track stored on a connected SD card once through and stops. In Arduino, open the example by navigating to File > Examples > SparkFun MY1690X MP3 Decoder Arduino ...