Post
Topic
Board Hardware
Re: Block Erupter Prisma (>=1.4 T/device, 0.75-0.78 W/G, <1 BTC/T, October Shipping)
by
praeluceo
on 19/11/2014, 15:38:07 UTC
I am seeing about doing a run of the USB adapters.  I will get it all set in a day or two and let you know prices and such.
Hopefully we can get these in more peoples hands.
They are harder to get a hold of than FiedCat right now. LOL

or has anyone tried using a regular USB to UART adapter?
One user modified an old Block Erupter USB (those small things that plug straight into a USB port) to work with a Block Erupter Prisma;
[DIY] Tube/Prisma USB Adapter from USB Blockerupter

He notes:
You should theoretically be able to use any CP2102 USB-UART witha 1K pullup resistor from 3.3V to RXD in this fashion.

YMMV

Hey, that's great, thank you! Now to see if I have any of those laying around, I have a feeling though that I don't. But CP2102s should be easy to find I think.

No kidding, I've sent emails and PMs to Friedcat and Phasebird, no luck. Sorry to hear about your popping cap (haha, we're Bitcoin gangstas, popping caps in the process of obtaining hash). I wonder if the proximity to the fan controller contributed? Maybe there's a short near the fan socket, or the potential for bridging between the the fan power and a trace that runs to that cap?

As far as the CP2102 goes, I think I have an old Sparkfun USB/serial adapter, but I have to find it:
https://www.sparkfun.com/products/retired/8531
Unfortunately, now all of their USB to serial devices use FTDI chips, which although should work, won't be detected by cgminer.

I'd be interested in following your progress on this! We've done a few (non-Bitcoin) board runs for various prototypes, and looking at this USB adapter it shouldn't be too difficult to mimic the functionality. I was just hoping to have everything hashing stably without having to wait for a custom PCB, parts, and then assembling it. You know, the expectation was kinda sorta that these would work...in October. But, AM became a preorder scam company apparently, and my main priority is salvaging some of my investment in their hardware, and being glad I don't own shares.