Note: Pin D9 on the Arduino is not the same pin 9 on the ATmega328 IC. Pin 15 on the IC is actually the pin for Digital Pin 9 (D9) on the Arduino. If you want to see the pinout for the ATmega328 IC, ...

Atmega328-PU/ Atmega328P-PU – 1 16Mhz Xstal – 1 22pF Ceramic Capacitor – 2 Small Breadboard / Protoboard & 28-Pin (PDIP) IC socket – 1 Your Arduino UNO board (here used as a programmer) If you go ...

which offers a ATmega328 microcontroller with Optiboot (UNO) Bootloader. The Metro 328 has been created to provide extra features on top of what you would expect from the Arduino Uno offering ...