Dirkbeyer:
// SenderID und Pins
const int txId = 1;
const int txPin = 0; output for atTiny84
const int humPin = 1; input for atTiny84
[/quote]
Are you sure this is the actual sketch you try to run? Because as it is posted, it doesn't even compile.
Then: "it doesn't work" is a useless comment. Please explain: what do you expect it to do, what does it do, and what doesn't it do?