Can I upload binary packages to a Launchpad PPA?

Well, I have a launchpad account and a just set up a PPA.

Since I don't have generated source packages, I'd like to upload my binary packages to the PPA.

Though it seems not possible... Is there a way to avoid create source packages?

No. You can only upload source packages to a PPA, for security and licensing (open-source) reasons; Launchpad will then build it into binary packages for you.

Do you have a GPG key? Does Launchpad know your key? In term of packaging, you can use debuild -S -sa -k<YourGPGkey> to build your *.desc file. After this, you can upload your source-package, *.dsc file to PPA. Launchpad will compile your code.