Arduino master slave ic2 flackern

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moin

ich habe 2 arduino uno rev 3 die sollen mit dem wire.h und sda und scl verbunden werden,
die reden auch mit einander und es funktioniert auch.
irgendas ist aber nicht richtig, die beiden flackern, das heißt die servo´s laufen unsauber und zuckeln und das licht flackert auf beiden boards.
ich habe schon die pullup widerstände mit verbaut, aber keine veränderung.
hat irgendjemand eine idee??

vielen dank

trino

welches licht?
verdrahtung?
scetch?


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