Hi, I have uploaded optiboot bootloader to my nano via ISP. My arduino IDE detects the board as optiboot 8MHz.Also I have selected the optiboot on 32 pin cpu (I have a 328p-au) in the ide.Ok. But millis() is not accurate (my 1min counter (at 16mhz), only count 48.5sec in order a min when running …

How to setup Arduino to 8mhz properly?

iduranb September 13, 2021, 4:17pm 3

@anon77129126 , what are the other ways to configure the 328p to 8mhz, with accurate millis() ? Please could you provide me any example or a link?

Topic		Replies	Views
Improved support for internal-clock, single-chip Arduino Libraries	12	7426	May 6, 2021
Arduino using external clock and 1mhz 3rd Party Boards	39	16387	May 6, 2021
External crystal on 328p ... 3rd Party Boards	7	2400	May 6, 2021
Bootloader for 328 with external 8MHz crystal 3rd Party Boards	4	2705	May 6, 2021
ATMega328p 20Mhz Troubleshooting	27	53122	May 6, 2021