Using this file instead of the standard ArduinoISP sketch, you can program an Atmega on a breadboard and use pins 3 and 4 to send Serial debug information back to your PC. This uses the Software ...

I modified ArduinoISP code a bit to report more details about the status and simulate programmer LEDs using the OLED display. Best used with the good old Wemos module with ESP32 and I2C connected OLED ...

While the new ArduinoISP (in-system programmer) board has been created to provide extra space on the Arduino board for developers and makers and is based on David Mellis’ projectFabISP.