I've read some articles on the forum about replacing crystals (and what the impact could be)
But I did'nt find a satisfying answer to my question.
1° - did anyone ever did it with succes (D-I-Y)? 2° - what would be a higher precision crystal for the MEGA 2560 ADK 3° - are there any "hands-on" articles on this issue (on the forum - or the internet), where I could learn to do something like that myself 4° - if its impossible, is there an alternative (higher speed MCU? still compatible with the arduino IDE)
For my project i can be no more than 50PPM off, it's a high precision,competition chronometer
I've read some articles that claim that the Mega 2560 is something like 1237ppm off !!?? Is this true? how does one measure something like that?