Hi all, thanks for the replies so far, I entered the command line as suggested and even though my miners will start working, they still only mine in Kh/s and not the GH/s as required. They are suppose to be produce 300kh/s each or up to 11Gh/s each on sha256 mode. I am trying to mine a sha256 base pool and not a scrypt pool so I not I have that right which bring me to one of 2 possibilities. Either 1) the command line code is still wrong or 2) I have been had and the miners I have are not the ones advertised. I'm not really bothered about the scrypt based currency, its more the sha256 I.E. bitcoin that I would like to mine, but still no joy

Im not too sure on what model the Gridseeds are, but here's a link to where I got them from maybe it would help?

http://www.ebay.co.uk/itm/3-x-Gridseed-Scrypt-SHA56-USB-miners-/251609438070?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2047675.l2557&nma=true&si=u2IlOU7kDQH9DF3qu92kBVebaZI%253D&orig_cvip=true&rt=nc

All I know is that they are ASIC dual miners and are suppose to be able to mine both litecoin and bitcoin currencies. Im currently mining for scrypt coins as I cannot figure out why it won't mine for bitcoins. I have set up the pools correctly and slushs pool apparently doesn't exist according to the miners. thanks

Hi everyone! To start with, hopefully this post is in the correct place, my apologies if it isn't. Im very new to the whole bitcoin mining thing so please be gentle OK, so finally after a solid week of learning, programming and pulling my hair out, I have some basic understanding of mining. Let me tell you my hardware setup then I'll get to my problems. I am running a Raspberry Pi B+ with Raspberian operation system and I'm using 3 dual mode Gridseed miners running off cgminer 3.7.2
I have figured out how to get them to mine in scrypt mode but I can't change the frequency of the units individually, I can only change all of them at the same time. My next problem is that I have tried mining on 2 Bitcoin sites (Slush's pool being one of them) and I can't get my miners to work with Slush's pool at all, so I used another site and managed to get my Gridseeds to mine BUT, again I can't change the individual frequency and they only mine in scrypt mode, also all shares are rejected. I have followed the instructions/tutorials and they should be working in GH/s in BTC mode but I'm getting KH/s. I have also noticed that while searching the internet for the command codes, they seem to vary slightly, this makes it awfully difficult to track down the correct code that works.

This is the scrypt code that works for me when I mine scrypt currency;

sudo ./cgminer --scrypt -o stratum+tcp://(server address):port -u (my username) -p (my password) --gridseed-options freq=850

This code gets the miners running but not correctly;

sudo ./cgminer -o stratum+tcp://(server address):port -u (my username) -p (my password)

I have tried many variations but this code starts and runs the miners for scrypt. So basically if anyone can help me and tell me why I'm getting KH/s when trying to mine bitcoin and what the correct code is to mine SHA-256 currency and also how to change the frequency of each unit, I would be most grateful. Like I said earlier, I'm new but I learn pretty quickly but just can't figure this one out. Many thanks