This is a useful addition to my previous article “Arduino EEPROM ... are address input pins (A0-A1-A2) for multiple device operation. Likewise, the SCL pin is the serial clock line and the SDA pin is ...

Morse code used ... out with an Arduino and a simple microphone. He wrote a basic sketch to read the input from the microphone and output the perceived volume over a Serial monitor as a series ...

In my case I ditched the serial port and use port D as a 8-bit port. I was able to use my ATMega8 to emulate an ISA bus cycle to write to an I/O port on a 8255 a few times faster than 3.5us.