ATmega2560 clone: Strange serial problem...

Hi,

beside some problems to upload sketches to an ATmega2560 equipped boards, which seems to be reported by several people, I encountered another strange problem now, which also seems to be related to the UART.

I used the "now" example sketch of the library "Sodaq_DS3231" to talk to a DS3231-board.

After finally get ot uploaded I started the serial monitor of the IDE and get this (baudrate set to
the value, which the sketch uses: 57600):

och: 2089732769
2165/165/165 45:165:165 ⸮;o⸮⸮h⸮乱⸮⸮⸮|⸮⸮⸮<?y⸮⸮ߞn<:⸮⸮ҫk⸮Ѫ⸮o+⸮3⸮r⸮⸮țo⸮߸⸮⸮⸮]⸮z9⸮⸮{⸮%⸮
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Seconds since

This is a lot of bit-smash and (surprisingly to me) some readable output.
I tried several settings for the line ending which influences a little the ratio between bit-smash and
readable characters.

I would understand if either everything would be readable or all get "encrypted"...but this mixture?

What did I possible wrong here?

Thanks a lot for any help in advance!
Cheers
mcc

You have 59 posts and still dont use code tags ( </> ) or include a sketch !

Not sure what to make of it.

The '165' issue has been reported several times; do a search and see if there is a solution. I haven't had that when using another library.

The rest of the data that you get looks like it comes from a bug in your code (non nul-terminated character array so serial.print does not know when to stop printing).

For both, post your code and use code tags. Also provide a link to the library that you use.