Thanks!

No I have not but I assume It would be very similar. there is some things you would have to change. 1. you will have to change the ATMega328 Variant to 328PB 2. watch out for the pin layout as it will be different I hope that helps Thanks for watching!

Not as far as I know. here is what the datasheet say about these pins: • XTAL2/TOSC2/PCINT7 - Port B, Bit 7 XTAL2: Chip clock oscillator pin 2. Used as clock pin for crystal oscillator or low-frequency crystal oscillator. When used as a clock pin, the pin can not be used as an I/O pin. TOSC2: Timer oscillator pin 2. Used only if internal calibrated RC oscillator is selected as chip clock source, and the asynchronous timer is enabled by the correct setting in ASSR. When the AS2 bit in ASSR is set (one) and the EXCLK bit is cleared (zero) to enable asynchronous clocking of Timer/Counter2 using the crystal oscillator, pin PB7 is disconnected from the port, and becomes the inverting output of the oscillator amplifier. In this mode, a crystal oscillator is connected to this pin, and the pin cannot be used as an I/O pin. PCINT7: Pin change interrupt source 7. The PB7 pin can serve as an external interrupt source. If PB7 is used as a clock pin, DDB7, PORTB7 and PINB7 will all read 0. • XTAL1/TOSC1/PCINT6 - Port B, Bit 6 XTAL1: Chip clock oscillator pin 1. Used for all chip clock sources except internal calibrated RC oscillator. When used as a clock pin, the pin can not be used as an I/O pin. TOSC1: Timer oscillator pin 1. Used only if internal calibrated RC oscillator is selected as chip clock source, and the asynchronous timer is enabled by the correct setting in ASSR. When the AS2 bit in ASSR is set (one) to enable asynchronous clocking of Timer/Counter2, pin PB6 is disconnected from the port, and becomes the input of the inverting oscillator amplifier. In this mode, a crystal oscillator is connected to this pin, and the pin can not be used as an I/O pin. PCINT6: Pin change interrupt source 6. The PB6 pin can serve as an external interrupt source. If PB6 is used as a clock pin, DDB6, PORTB6 and PINB6 will all read 0. Here is a link to the datasheet: ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf page 65 is where you can find this info Thanks for watching!

@@prettymuchflawless-cn1ms Thank you

is there a crystal connected?

From AliExpress here is the link: www.aliexpress.com/item/1005005925028098.html?spm=a2g0o.order_list.order_list_main.10.15ea1802UkmVN8 it was $20 so fairly inexpensive Thanks for watching!

@@prettymuchflawless-cn1ms Wow that's a great price, got me a 44-pin one for my ATMEGA1284, thanks for the pointer