That's interesting idea. Good luck!
But I think it would take a very long time. And bitcoin mining profit reduces every day... My wishes to you to break even

thank you very much Sir. I ask myself wether the mentioned Raspberry PI controller is included in the redeem-hardware offer (which is a least 40 euro-pesetas and more here in germania) or not, but will report this.
As I remember - yes. They must include raspberryPi because it has miner soft installed.