lardconcepts
Posts: 43
Joined: Mon Feb 04, 2013 11:32 am

Where to sell my partially developed assistive audio PI case?

Sun Feb 24, 2019 12:26 pm

I'm not sure whether it'll be allowed over in https://www.raspberrypi.org/forums/viewforum.php?f=102 but way back in 2012, before Alexa etc, I was given a grant to develop PI-based assistive radios for the blind at what was intended to be a more affordable price than the only other device available at £425 at the time. We got as far as a prototype case and control panel which found approval amongst the blind community.

And then the Welsh govt scheme just suddenly closed before we got to the UI part. Seems a shame to waste all that effort, but rather have them gathering dust on the shelf forever, I was wondering if there was ANY interest in the 4 unassembled prototype cases? Would ebay be the best place to try?

Included: Control panel circuit with illumination and alternative firmware (control panel lights normally on vs normally off) but NOT original source code (however, it's reasonably simple), soft-touch panel, all design files etc

NOT included: Speaker, Winstar OLED display, Raspberry PI.

With Alexa devices costing under £30 these days, it might be the case that I won't even cover the postage; however, with all the time put in, it would be a shame if it didn't find a use somewhere. Any ideas?
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Andyroo
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Joined: Sat Jun 16, 2018 12:49 am
Location: Lincs U.K.

Re: Where to sell my partially developed assistive audio PI case?

Sun Feb 24, 2019 6:35 pm

You could try the 'for sale' on here, Etsy, Ebay or Tindie

Of these here or Tindie may be the best bet.

Also letting folk know in the local Pi Jam / Makerspace may work.

How much do you want for one?
Need Pi spray - these things are breeding in my house...

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SolarPiCam
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Joined: Fri Aug 22, 2014 3:25 pm

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 02, 2019 9:02 am

I'd be very interested in buying one of these.

How much are they?

I can do eBay or direct PayPal.

Andyroo
Posts: 2834
Joined: Sat Jun 16, 2018 12:49 am
Location: Lincs U.K.

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 02, 2019 11:25 am

SolarPiCam wrote:
Sat Mar 02, 2019 9:02 am
I'd be very interested in buying one of these.

How much are they?

I can do eBay or direct PayPal.
The OP never came back to me with a price either :cry:
Need Pi spray - these things are breeding in my house...

lardconcepts
Posts: 43
Joined: Mon Feb 04, 2013 11:32 am

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 02, 2019 11:30 am

SolarPiCam wrote:
Sat Mar 02, 2019 9:02 am
I'd be very interested in buying one of these.
Hi there Solar! Well, I went and listed the whole project as one "lot" on ebay at http://ebay.us/UF4HuL?cmpnId=5338273189
  • Control panel circuit with illumination - SPI interface
  • Alternative firmware (control panel lights normally on vs normally off)
  • Soft-touch panel
  • PCB layout files
  • All PDF and IGS design files etc - photos only show part of drawing. Complete pack will be provided via download link or on CD if preferred.
  • Other early prototype drawings
NOT included:
  • Original control panel source code (Welsh Gov kept that - weirdly!)
  • Speaker, Winstar OLED display, Raspberry PI.
Would be delighted if someone project-minded bought it!

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SolarPiCam
Posts: 16
Joined: Fri Aug 22, 2014 3:25 pm

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 02, 2019 2:56 pm

That's great, but I'd ideally be looking to purchase just one. Would you be willing to separate them? I don't mind buying all four, but then I'd be reselling the spares if you didn't mind.

From my understanding of what you've said, the control panel is fully working and ready to interface, but the original code isn't available. Is any information on how to interface over SPI with the control panel available?

lardconcepts
Posts: 43
Joined: Mon Feb 04, 2013 11:32 am

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 02, 2019 3:02 pm

Can't really change the listing in the last 2 days of the sale - sorry!

Yes, the SPI interface is pretty simple - here's some of the info from the company that made the panel.... - excuse the formatting, I'm copying off a PDF.... hope it helps!

"When the RPi asks for data on the SPi we send the first byte which is the 4 bit switch value:


Bit 0 - Right

Bit 1 - Middle

Bit 2 - Left

Bit 3 - Encoder



The top 4 bits of this byte indicates whether the next byte of data is the last in the buffer; so Bit 7-4 = “F” if the following byte is the end of the buffer.

If it is the last byte then you simply need to read the SPI one more time and then you can end the SPI requests.




The second byte we send is the two’s complement rotary switch value RELATIVE to the previous rotary switch byte. To explain this a little more, the original value of the switch is always 00, rotating the switch 4 pulses clockwise will give us 04H which is stored in our buffer. If the switch is then rotated a further 3 clicks the absolute value will be 07H, however, we store the relative value of 03H and this is what you would see on the SPI. If we now rotate 5 clicks anticlockwise then the absolute value would be FEH, but we would store the relative value FBH.

Our code works in such a way that you have an initial poke of data from the Master (as you do I believe), then the first data you get back is rubbish but subsequent requests give you the correct data every single time. So once the polling has started, other than
the first full-duplex byte of rubbish, we will always have the next byte of data in the register for you to read.


So the flow is.................


Poke (any) data to SPI - the full duplex returned is ignored.

Poke (any) data to SPI - the full duplex returned byte is valid data.

HERE: Test for “FxH”.........


Yes - poke a decent value (e.g. “81H”, “F0H”) which we may or may not need for future work but at least this is an acknowledgement of receiving the end of buffer marker;
and the full duplex returned is the last value of the buffer. END TRANSFER

No - poke (any) data to the SPI - the full duplex returned byte is valid data.

Poke (any) data to SPI - the full duplex returned byte is valid data.

goto HERE

The important thing is the very first read is a dummy read and the duplex data returned is just nonsense.

The next read and subsequent reads are valid data.

FxH is last but one byte because top 4 bits are “F”.


100 sets of (2 byte) data that can be stored, i.e. 200 bytes of buffer space."

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rpiMike
Posts: 753
Joined: Fri Aug 10, 2012 12:38 pm
Location: Cumbria, UK

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 09, 2019 2:13 pm

I was the only bidder! Result :)

I've hooked up one of the prototypes to an old Pi. Just streaming Radio 1,2,3 and 4 for now. Need to get an OLED display, speaker, amp and rotary knob.

https://youtu.be/vFbuIg8wLt4

Image

lardconcepts
Posts: 43
Joined: Mon Feb 04, 2013 11:32 am

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 09, 2019 2:29 pm

rpiMike wrote:
Sat Mar 09, 2019 2:13 pm
I was the only bidder! Result :)
Yay - this is most satisfying to see!

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scruss
Posts: 2224
Joined: Sat Jun 09, 2012 12:25 pm
Location: Toronto, ON
Contact: Website

Re: Where to sell my partially developed assistive audio PI case?

Sat Mar 09, 2019 3:10 pm

I came close to bidding, but the postage would've made it unlikely.

That's a really nice case. Maybe worth making the design open source so folks can mod it for recent Raspberry Pi boards.
‘Remember the Golden Rule of Selling: “Do not resort to violence.”’ — McGlashan.

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