I checked the price the mt8808ae are cheap compared to other chips Another problem is to place the Bluetooth module at the right place that's why I'm thinking to put a connector with either the hc05 on the PCB (if it works), or with a flat cable and hold over the shield with double side tape the slave module on a breadboard: http://6809.eu/usbkey-breadboard.jpg Another problem: the connector for C116 / Plus4 I made one with a row of pins with the pins thinned with a diamond file (works fine but took me hours to make one) On 30/06/2015 21:38, email@example.com wrote: > On 2015-06-30 20:55, didier derny wrote: > >>>> All the projects I found are using analog switch so I moved to this >>>> solution I found 3 chips, this one is different >>> I am not sure I understand this. Is your project going to use an >>> analogue switch IC or not? I take "yes", judging by the following parts. >> yes seems ok, several project use this solution or variation on this >> solution > I see. For a moment I thought that maybe you found a way to make it work > reliably w/o the switches. Those chips are quite budget hungry. > >> I'm using bt module to avoid piercing hole in old cases > That's what I like about it. I'd imagine (my favourite approach) a kind > of riser board getting between the original kbd connectors and allowing > wireless KBD for the old machines. I love this idea. > >> I want a very small slave board small enough to fit inside a C116 > Would be great, of course. Even if you have for example separate the > power supply unit to another small one (like if you need something else > than 5V) it might still be a viable approach. > >>> I remember I looked at "Analog Devices" chip some time ago. I checked >>> now and found: >>> >>> http://www.analog.com/media/en/technical-documentation/data-sheets/ADG2188.pdf >>> >>> seems to be still "current", small and available in quantities but the >>> supply is either 12V or +/-5V, which incurs extra cost per board. But... >> I'll check this one but I don't like the 12v > The one you mentioned needs it too. > >> Once it is working correctly on several machine, if someone wants to >> take the control of this project >> and produce the board... I'll give all the détails (there is only one >> condition, the goal of this project >> is not to make money but to produce a board with a modern keyboard for >> our old machines > Well, one doesn't even make a living with those things today, let alone > real money ;-) In any case, even if you offer the designs and > ready-to-produce files/documentation, expect that there always will be > some people who will try to "make money" by selling those on ebay or so. > >> where the original >> keyboard is often faulty (I've never really been able to use my C116 due >> to keyboard problems) > I guess all C116s suffered the same fate. Their keyboards were probably > worse than Sinclair's ones. > >> I've a small problem if I want to support the old pets the 8x8 is not >> enough > The family of chips I pointed you to has also 8x12 variant. That should > cover up to 96 keys, I guess. > Message was sent through the cbm-hackers mailing listReceived on 2015-06-30 21:00:08
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