Hi bernhard,
serial.read() read a single byte.
read the Serial input basics by Robin2
best regards Stefan
Be the change you want to see in the world
This notion of be the change you want to see in the world does 3 powerful things when we adopt it:
It stops us from judging others;
It replaces complaining about others with reflection on self;
It stirs us into taking action within the only thing in the world over which we have any control: ourselves.