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Forum Index : Microcontroller and PC projects : CMM2 Breadboard
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hitsware2 Guru  Joined: 03/08/2019 Location: United StatesPosts: 719 |
Will one of these fit the CMM2 ? my site |
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| mkopack73 Senior Member  Joined: 03/07/2020 Location: United StatesPosts: 261 |
Yes it should... Same 40 pin connector and (IIRC) same pinout as the pi has. |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
Good Oh ! my site |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6271 |
Just make sure that the pins end up the right way around. If your CMM2 has a shroud around it's 40 way connector, it is likely to have the cutout on top. This will cause the cable to connect the wrong way around. The easier fix is to attack the shroud with the side cutters and put a cutout in the bottom. This lets pin1 go where it should. Jim VK7JH MMedit |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2949 |
Hi Hitsware, All, Or you might be interested in one or both of my Breadboard designs I advertised in my COMMERCIAL thread here. Up near the top of Page Number 7. The Breadboard version doesnt take up as many holes in on the breadboard as the one you linked to.. The header is the correct way around for you for the CMM2 as well. Page 7 of Miks-Bits A link to my brief describing them can be found >>> HERE !! <<< The directory that I have some more pictures etc, including my current price list for them, can be found. >>> HERE !! <<< A link to my other products that you may like as well can be found in my signature at the bottom of my post Kind Regards Mick Edited 2020-07-23 13:46 by bigmik Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
Whew .... Thank You .... How did that happen ? It will be this one ... my site |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6271 |
Unless it's changed, that one doesn't have the shroud. Just keep pin 1 of the cable adjacent to the VGA socket. The RPi breakouts tend to connect all the GNDs together as well as all 3.3V and 5V. Not a problem as the CMM2 (deliberately) uses the same pins but not good if things go back to front. Jim VK7JH MMedit |
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Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1641 |
But that would still leave the possibility of inserting the connector around the wrong way  Wouldn't it be better to remove the cable connector and reverse it?If the breakout is meant for RPi shouldn't it be correct for the CMM2? Of course you should double check before connecting anything to it! Bill Keep safe. Live long and prosper. |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
Thank You ! How would I specify the cable to mate your board to the CMM2 ? ( Or RPi ? ) my site |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6271 |
The cable is a standard 40 way IDE cable. It is the type that was used for hard drives before they went to 80 core cables. You can't use the 80 core cables even though the connectors look the same. If you are digging through the scrap heap of cables, many of the IDE cables don't have the locating lugs on them. This allows them to be inserted either way without having to change anything. Be aware that some IDE cables have one pin blanked out. That was their way of preventing users from inserting them the wrong way around. Those cables are of little use for our purposes. Any computer store will have a box full of the suitable cables in various lengths. Jim VK7JH MMedit |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 871 |
Hi all, I have one of the OP's items (I bought it in Aus. from Jaycar). Another problem with them is that, because of their width, they consume a lot of your breadboard. (because of that I haven't used it in anger - preferring to use Mick's). I now have several of BigMik's Breadboard designs. They only take up one column each side of the centre leaving you plenty to play with. Mick has also sorted the pin 1 to pin 1 issue (so I just use the 40-way female to female cable that came with the OP's device). As Tassy Jim says you can get the 40-way cables most places or I now make them up with IDC connectors and cable. Here is a pic off BigMiks website and you can see that the pins are a minimum distance apart for the breadboard (you can only see one row of pins - the other is only 8mm - 5/16" away). Cheers, Andrew  |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
Good Point ! This one doesn't look too bad , and Colorado is way closer than Down Under   my site |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6271 |
I only count 17 pins either side. Also the GND, 3.3V and 5V positions look suss to me. I would prefer to use one that has the pins in the same position as the CMM2 connector. On the plus side, the pins look closer together than the usual suspects. Jim VK7JH MMedit |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
I noticed after I posted ....Here's the one I ordered ... my site |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2949 |
Hi ALL, @hitsware2 Yes but that is the wide version that loses a lot of breadboard area.. Why would they do the 34 pin with a small width but go and make the 40pin one with a wider (0.6”?) width? Seems dumb to me.. I admit I would prefer the cable horizontally but it isn’t that difficult to fold the cable so it is not really in the way. If you want any of my PCBs I am happy to send you some, Postage (pre Corona) was typically 7 days from Aus but that has drifted to more like 14 days.. But the postage is a fickle thing.. PM. Me if interested in my version.. At least you dont have to worry about the orientation of the notch on the header as mine were designed with the CMM2 in mind.. @AndrewG, Thanks for the kind words, I am glad that you are getting some use out of them. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 719 |
@ mick Yes .... Your's is a way more elegant approach . You don't have a web-store ? my site |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2949 |
Hi Hitsware, No, I am retired now and don't own a business. I do these as a hobby, if I make enough for beer money I am more than satisfied.. I have a web site that is more of a `repository of files' that is kindly hosted by my friend Don, who formerly ran Dontronics.com, unfortunately he has closed Dontronics down and effectively parked it to keep his web name active and to host my files for me. Something about the way it is `parked' doesn't allow proper web page hosting.. (I don't understand these things..) I have been told many times that my web pages suck (Big Time) but then if I did things properly I doubt that I would have the time to run a business properly, so I keep it as it is.. Lately over the last 18 months or so (excluding some CMM2 I have sold) I have spent more money on `little bits of fibreglass' than I have received beer money.. But profit isn't what `floats my boat'.. I am happy that I have boards for any little project I need and very happy if I can offer a cheap way for someone else to do what they need. I do this to stay sane, (Many will say it didn't work) All that aside I am looking into (and started) writing something with sea-monkey to better portray my `offerings' but I doubt it will ever progress to having online store etc.. Anyway my `site's' link is in my signature file, and listed above in the link. I am more than happy to assist you if I can. Kind Regards Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1641 |
Mick, Have you considered a version of your prototyping board that has the connector oriented in the same way as on the CMM2? That would allow it to be the basis for an expansion unit to fit in a case that will sit on top of or beneath the CMM2. With a little surgery on the tracks it could also be useful for the original Maximites. Bill Keep safe. Live long and prosper. |
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