is alarm declared as volatile ?
Maybe create a minimal but complete sketch which highlights the problem, and post that.

I might have used softer language but my conclusion is exactly the same as @Nick_Pyner


If you want help then it is your task to try very hard so we don't have to. We are not being paid to help you.

...R

so, if you dont understand the issue (whatever the reason (too complex, nonsense, foreign language, out of site scope....), dont help.
if you dont understand the issue but you want to get paid to solve it, then suggest a transfer to "gigs and collaboration".

everybody has the right to have opinion. The right and the opinion should be (and is- by me-) respected.
No member is oblidged to spend time in order to think a solution to another member;s problem. But, if a member wants to involve and thinks that the "data" given by the OP is not sufficient, he can ask for more details.
it is tottally impolite for anybody to say that somebody else;s writing is nonsense.

Well, that is my opinion and I expect it should be not critisised.

at #2, david_2018 asks for details and I respond.

Anyway
Although I disagree , I will not stop to support the right for everybody to have his/her opinion.

pls do not continue posting, the issue is solved. Because Im considered newbie I cannot edit the initial subject to wright [solved] in.
thank you

have a nice day

Il faut des résistances de pullup sur SDA et SCL en général on utilise des résistances de 4.7k.
Sur internet tu trouveras plus de détails sur le calcul des pullup et le calcul sur des topologies plus complexes. Par exemple ici.

Par contre si tu utilises des modules, quelquefois les modules intègrent des résistances de pullup. Il faut donc vérifier avec les modules utilisés.

Benvenuto,
essendo il tuo primo post, nel rispetto del regolamento della sezione Italiana del forum (… punto 13, primo capoverso), ti chiedo cortesemente di presentarti IN QUESTO THREAD (spiegando bene quali conoscenze hai di elettronica e di programmazione ... possibilmente evitando di scrivere solo una riga di saluto) e di leggere con MOLTA attenzione tutto il su citato REGOLAMENTO ... Grazie.

nid69ita

P.S.: Ti ricordo che, purtroppo, fino a quando non sarà fatta la presentazione, nessuno ti potrà rispondere, quindi ti consiglio di farla al più presto.

Vielen Dank euch beiden.

Das funktioniert ja super, damit kann ich nun weiter arbeiten und evtl noch verfeinern.