Building Glasgow

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Revision as of 14:15, 4 January 2020 by Noopwafel (talk | contribs)
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Project Building Glasgow
Glasgow-render.jpg
debugging PCB assembly so we can build a PCB to debug our PCBs
Status Initializing
Contact noopwafel, Shiz
Last Update 2020-01-04

Wha?

We're going to try assembling some Glasgow [1] PCBs. The FPGA is BGA, and there are way more than >100 jellybean parts to place, so this will probably involve the Reflow Oven. Failure is fun!

If we make this work, then we can probably put a bunch of them together for <100eur each, but for now this is just an experiment.

Glasgow is described as an `open source multitool for digital electronics'; it's basically an FPGA with configurable level shifting for 16 ESD-protected I/O pins, so you can connect it to a whole bunch of random interfaces:

Glasgow-block-diagram-1.png

Status

We ordered 50 revC1 PCBs and a stencil from JLCPCB.

  • They are currently being manufactured. They asked for confirmation that the solder mask layer was meant to be missing the DNP parts, replied.

noopwafel plans to buy about 10 board's worth of components; the total BOM cost is about 70eur in these quantities.

  • We managed to import a BOM into Mouser, and to break Digikey's BOM manager.
  • Mouser has almost all the components, except we need to substitute some jellybean parts and some LEDs.
  • Still need to check whether they all make sense.
  • The FPGA is only available in useful (small) quantities from Digikey. Will check prices for other components there and then split the order if needed.
  • YC248-JR-0710KL is fine (the 'L' is somehow an optional part of the part number...)

Also checked whether there's anything which is cheaper to buy in larger quantities:

  • 100: YC248-JR-0733RL