RogerClark wrote: ↑
Thu Sep 28, 2017 9:53 pm
Rather than putting your effort into making a board that is physically compatible with the Due, I think there is a much bigger market for a F4xx version of the BluePill
that would be interesting... i should mention that i have a chain of requirements which means i (personally) would need to go via the due form-factor first: i'm doing an upgraded (open) version of the RAMPS 1.4, because RADDS 1.5 (the closest thing to it) is... proprietary. *sigh*. and sourced from EU/USA (digikey / mouser). eurocircuits is damn good but when the components are 4-5x the price because of tax, shipping and middle-man markups....
however i'm more than happy to help (and perhaps start a different thread?)
https://world.taobao.com/item/415598160 ... 0b62jQ1bU1
There have been a few discussions about this, and there used to be a board available called the STM32 Stamp, which is very similar to what I am suggesting.
But AFIK, its not currently in production and was very expensive as it was made in small quantities in the USA
$0.81 on the china-version of ebay, selling for around double that with actual components. mad. absolutely mad.
We have plenty of people on the forum, who are totally able to do the CAD as far as PCB, but AFIK no one has contacts in China who could get a board manufacturer eg. populated with components at the sort of prices that the chinese companies seem to be able to do it.
... for now!! living costs in shenzhen now actually exceed london: most chinese people are moving progressively further out. i was able to stay at a hostel for $5 / night until the police dropped by (cameras on the street corners...) and found that they'd not registered for foreigners... whoops.
We would need a Chinese partner company who would do all the manufacturing and make the boards available on AliExpress, probably through multiple third party companies.
yeah i can help with that for sure. i have my regular contacts - a friend (mechanical engineer) who lives in HK, he does QA and Sourcing. does destruct-testing to make sure that factories have enough fire-retardant in the plastic, electrical safety checks, much more besides. the other main one is Vast Electronics, young guy, just taken over from his father about 3 years ago, very very conscientious... but also like everyone right now REALLY busy until after the main holidays beginning october. basically that's the time that everyone in the West rushes things ready for Xmas. so, mid-october he'll be back, and a hell of a lot less stressed out and able to help immediately. beyond that i have a couple others.
This would not give anyone outside China any fiscal return on investment, but we would get a board that would be very popular and most likely sell in reasonable quantities
sounds absolutely great. i'll need gerbers and a BOM to get some quotes.
.... which are probably here!
or i can generate them. can i suggest starting another thread for this one, roger?
http://www.st.com/content/st_com/en/pro ... 405rg.html
I looked at the specs on the F405RGT and the main reason its used on the STM32 Stamp as its one of the few F4 processors in a small footprint, but has less IO's because of this
woww that's a nice set of specs. *shocked*... $5 in 10k volumes, what the hell is going if it's being sold - on an actual board - in china - for $2 for??? uhn??
There is also the F415RG which seems to also have crypto, but I suspect there would be very little call for this by most Makers.
I can see 405RG's on AliExpress for
US $4.25 / piece in quantities of 20, which isnt that bad....
well, the main thing is, buying using someone you trust because if they screw you and it's already outside of china, it's A a 30% taxable return item due to customs duty (or it will just... "disappear" at customs... had that happen...) and B as you're not a chinese national they don't actually have to do jack. agents (engtaobao) are good for this because their reputation is critically dependent on you not shouting loudly and publicly "i got ripped off!"
also... it's uuuusually a good idea to use someone in china who can actually inspect the goods... otherwise they tend to go "oh uh yeah we couldn't get that part cheaply any more.... so we just decided without telling you to totally replace the product with something else. are you phoning to place a repeat order? we'll take your money nooo problem".
[my friend in HK had to help out a client that bought USB sticks for the OLPC XO-1 laptops... samples no problem, first batch no problem, 2nd batch of 1,000... totally different IC, way cheaper... and not properly USB-compliant so the XO-1's BIOS refused to boot off of them because... yeah long story....]
anyway yes, great idea. will have to wait a bit though, my friend delayed his trip back to the UK because of helping out SZ clients before the holiday rush. he'll be back in... a couple of weeks, we can get some quotes then.