Building Glasgow - Revision history

Eightdot at 16:32, 1 March 2020

2020-03-01T16:32:17Z

← Older revision		Revision as of 16:32, 1 March 2020
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Noopwafel at 15:50, 26 February 2020

2020-02-26T15:50:44Z

← Older revision		Revision as of 15:50, 26 February 2020
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	Obviously we're hand-building these, and we'll test them as well as we can, but: no warranty (other than you coming back and we can debug them together and replace any dead parts). :) The Glasgow boards are designed to be pretty resilient (e.g. there's no problem if you short stuff to ground). At some point there will also be a [https://www.crowdsupply.com/1bitsquared/glasgow official crowdsupply campaign] by esden, with mass-produced boards.		Obviously we're hand-building these, and we'll test them as well as we can, but: no warranty (other than you coming back and we can debug them together and replace any dead parts). :) The Glasgow boards are designed to be pretty resilient (e.g. there's no problem if you short stuff to ground). At some point there will also be a [https://www.crowdsupply.com/1bitsquared/glasgow official crowdsupply campaign] by esden, with mass-produced boards.

			=Status=

			As of 18th Feb 2020, the first board works, but pin A7 is flaky. Replaced the level shifter on Feb 20: now everything seems to work! Look at the pretty lights:

			[[File:Glasgow_working.jpg\|500px]]

	=Wha?=		=Wha?=
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	[[File:Glasgow-block-diagram-1.png\|500px]]		[[File:Glasgow-block-diagram-1.png\|500px]]

	=~~Status~~=		=Log=

	~~As of 18th Feb 2020, the first board works, but pin A7 is flaky. Replaced the level shifter on Feb 20: now everything seems to work!~~

	noopwafel tried making one in the reflow oven (14th Feb 2020). Next time need to check reflow temp profile, placement in oven, placement of components, how to apply solder paste, need better tweezers, and there are other lessons along those lines. Having said that, it looks OK:		noopwafel tried making one in the reflow oven (14th Feb 2020). Next time need to check reflow temp profile, placement in oven, placement of components, how to apply solder paste, need better tweezers, and there are other lessons along those lines. Having said that, it looks OK:

Noopwafel at 15:46, 26 February 2020

2020-02-26T15:46:13Z

← Older revision		Revision as of 15:46, 26 February 2020
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	=Want one?=		=Want one?=

	We have enough parts for 5 boards, and most of the parts for another 5; costs should be ~~around~~ 100eur (you get our assembly time for free).		We have enough parts for 5 boards, and most of the parts for another 5; costs should be no more than 100eur (you get our assembly time for free).

	{\| class="wikitable sortable"		{\| class="wikitable sortable"

Noopwafel at 15:45, 26 February 2020

2020-02-26T15:45:49Z

← Older revision		Revision as of 15:45, 26 February 2020
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	\| noopwafel \|\| 2 \|\| Partially (1)		\| noopwafel \|\| 2 \|\| Partially (1)
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			\| Shiz \|\| 1 \|\| nope
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Noopwafel at 15:45, 26 February 2020

2020-02-26T15:45:30Z

← Older revision		Revision as of 15:45, 26 February 2020
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	\|Picture=Glasgow-render.jpg		\|Picture=Glasgow-render.jpg
	\|Omschrijving=debugging PCB assembly so we can build a PCB to debug our PCBs		\|Omschrijving=debugging PCB assembly so we can build a PCB to debug our PCBs
	\|Status=~~Initializing~~		\|Status=In progress
	\|Contact=noopwafel		\|Contact=noopwafel
	\|Contact1=Shiz		\|Contact1=Shiz
	}}		}}

			We're going to try assembling some Glasgow [https://github.com/GlasgowEmbedded/glasgow] PCBs. The FPGA is BGA, and there are >100 jellybean parts to place, so we are using the [[Reflow Oven]]. Failure is fun!

			=Want one?=

			We have enough parts for 5 boards, and most of the parts for another 5; costs should be around 100eur (you get our assembly time for free).

			{\| class="wikitable sortable"
			\|-
			! Who? !! How many? !! Built?
			\|-
			\| noopwafel \|\| 2 \|\| Partially (1)
			\|}

			Obviously we're hand-building these, and we'll test them as well as we can, but: no warranty (other than you coming back and we can debug them together and replace any dead parts). :) The Glasgow boards are designed to be pretty resilient (e.g. there's no problem if you short stuff to ground). At some point there will also be a [https://www.crowdsupply.com/1bitsquared/glasgow official crowdsupply campaign] by esden, with mass-produced boards.

	=Wha?=		=Wha?=
	We're going to try assembling some Glasgow [https://github.com/GlasgowEmbedded/glasgow] PCBs. The FPGA is BGA, and there are >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 (looks like total BOM+VAT is about 75eur), 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 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:

Noopwafel at 16:40, 20 February 2020

2020-02-20T16:40:31Z

← Older revision		Revision as of 16:40, 20 February 2020
Line 18:		Line 18:

	=Status=		=Status=

			As of 18th Feb 2020, the first board works, but pin A7 is flaky. Replaced the level shifter on Feb 20: now everything seems to work!

	noopwafel tried making one in the reflow oven (14th Feb 2020). Next time need to check reflow temp profile, placement in oven, placement of components, how to apply solder paste, need better tweezers, and there are other lessons along those lines. Having said that, it looks OK:		noopwafel tried making one in the reflow oven (14th Feb 2020). Next time need to check reflow temp profile, placement in oven, placement of components, how to apply solder paste, need better tweezers, and there are other lessons along those lines. Having said that, it looks OK:

	[[File:Glasgow-reflow-attempt1.jpg\|300px]]		[[File:Glasgow-reflow-attempt1.jpg\|300px]]

	~~As of 18th Feb 2020, the first board works, but pin A7 is flaky. Replaced the level shifter on Feb 20: now everything seems to work!~~

	We ordered 50 revC1 PCBs and a stencil from JLCPCB.		We ordered 50 revC1 PCBs and a stencil from JLCPCB.

Noopwafel at 16:40, 20 February 2020

2020-02-20T16:40:19Z

← Older revision		Revision as of 16:40, 20 February 2020
Line 23:		Line 23:
	[[File:Glasgow-reflow-attempt1.jpg\|300px]]		[[File:Glasgow-reflow-attempt1.jpg\|300px]]

	As of 18th Feb 2020, the first board works, but pin A7 is flaky~~, need~~ to ~~debug why.~~		As of 18th Feb 2020, the first board works, but pin A7 is flaky. Replaced the level shifter on Feb 20: now everything seems to work!

	We ordered 50 revC1 PCBs and a stencil from JLCPCB.		We ordered 50 revC1 PCBs and a stencil from JLCPCB.

Noopwafel at 22:22, 18 February 2020

2020-02-18T22:22:55Z

← Older revision		Revision as of 22:22, 18 February 2020
Line 22:		Line 22:

	[[File:Glasgow-reflow-attempt1.jpg\|300px]]		[[File:Glasgow-reflow-attempt1.jpg\|300px]]

			As of 18th Feb 2020, the first board works, but pin A7 is flaky, need to debug why.

	We ordered 50 revC1 PCBs and a stencil from JLCPCB.		We ordered 50 revC1 PCBs and a stencil from JLCPCB.

Noopwafel at 08:50, 16 February 2020

2020-02-16T08:50:33Z

← Older revision		Revision as of 08:50, 16 February 2020
Line 15:		Line 15:
	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 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:

	[[File:Glasgow-block-diagram-1.png\|~~800px~~]]		[[File:Glasgow-block-diagram-1.png\|500px]]

	=Status=		=Status=

			noopwafel tried making one in the reflow oven (14th Feb 2020). Next time need to check reflow temp profile, placement in oven, placement of components, how to apply solder paste, need better tweezers, and there are other lessons along those lines. Having said that, it looks OK:

			[[File:Glasgow-reflow-attempt1.jpg\|300px]]

	We ordered 50 revC1 PCBs and a stencil from JLCPCB.		We ordered 50 revC1 PCBs and a stencil from JLCPCB.
	* They asked for confirmation that the solder mask layer was meant to be missing the DNP parts, replied.		* They asked for confirmation that the solder mask layer was meant to be missing the DNP parts, replied.
	* They arrived and are in noopwafel's samla.
	* We also have solder paste.

	noopwafel bought about 10 board's worth of components.		noopwafel bought about 10 board's worth of components.
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	* Future thoughts: the HX4K is 1eur cheaper. Also, jellybean parts could be cheaper.		* Future thoughts: the HX4K is 1eur cheaper. Also, jellybean parts could be cheaper.
	* noopwafel has a BOM spreadsheet for managing this now; order split between mouser, digikey and TME.		* noopwafel has a BOM spreadsheet for managing this now; order split between mouser, digikey and TME.
	* In theory, we now have all of the parts we need!		* In theory, we now have all of the parts we need! (Later note: turns out we missed 18pF 0402 caps, but there were some in the space's inventory.)

	~~We should put together~~ some ~~simpler boards~~ in the ~~reflow oven. noopwafel plans to try one of the iceGLITCH boards~~.

Noopwafel at 17:04, 20 January 2020

2020-01-20T17:04:01Z

← Older revision		Revision as of 17:04, 20 January 2020
Line 28:		Line 28:
	* Future thoughts: the HX4K is 1eur cheaper. Also, jellybean parts could be cheaper.		* Future thoughts: the HX4K is 1eur cheaper. Also, jellybean parts could be cheaper.
	* noopwafel has a BOM spreadsheet for managing this now; order split between mouser, digikey and TME.		* noopwafel has a BOM spreadsheet for managing this now; order split between mouser, digikey and TME.
	* ~~Parts are~~ all ~~ordered~~! ~~TME ones arrived already, Digikey/Mouser also shipped.~~		* In theory, we now have all of the parts we need!

	We should put together some simpler boards in the reflow oven. noopwafel plans to try one of the iceGLITCH boards.		We should put together some simpler boards in the reflow oven. noopwafel plans to try one of the iceGLITCH boards.