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I doubt if a raspberry Pi is able to search through the plots fast enough in order to report your deadlines in time. Furthermore it is certainly a good idea to start mining with those HDD's. I am currently mining with 10 TB and making reasonable profit, good luck :D

Thanks for your advice! Yes I'm still looking for a not to much energy consuming way to work it out! Maybe you should make a guide about how you did it!? :-)

I agree with your concerns about power usage. I mine Burstcoin while my graphics card is mining Zcash. My burstcoin mining profits are paying the electricity bill and the graphics card is making the real money! ;)