The hardware was assembled by connecting the Arduino UNO R4 WiFi, the PZEM 004T, the current transformer, and the OLED ...

This example code is in the public domain. http://www.arduino.cc/en/Tutorial/ForLoop int timer = 100; // The higher the number, the slower the timing.

This sketch shows how to use the serial transmit pin (pin 1) to send MIDI note data. If this circuit is connected to a MIDI synth, it will play the notes F#-0 (0x1E) to F#-5 (0x5A) in sequence. The ...