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Forum Index : Microcontroller and PC projects : Proto Board for the uMite 28
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Bryan1 Guru  Joined: 22/02/2006 Location: AustraliaPosts: 1486 |
Hi Mick, Great looking small board mate, now with J2 I just had a look at my usb/ttl dongle and the pinout is 3v3-5v-TXD-RXD-Gnd. Kalex were good enough to send me a second dongle free after I complained the usb header was damaged and the driver for win7 works a treat. It would be great if the pinout on J2 could be changed to suit mate. |
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jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Great board Mick I would like a few please (3-5). If you are going to make the available Thanks Jman |
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Lou Senior Member  Joined: 01/02/2014 Location: United StatesPosts: 229 |
Mik, The board looks great, I could go for a few of those (3-5 like jman) if you want to make extras. It is similar to the hand built proto boards me and Zonker used before the PCB's came out, female headers next to the chip worked out well for hooking to protoboards. I wired J2 to match the Sparkfun 718 breakout board, and had a small sea of holes. I like the way you put the arrows to indicate data direction flow, that should be in all future PCB's. I wonder if the holes line up in case you want to use a TO-92 size 3v3 regulator like an MCP1702 for very low power applications. Me and Zonker were talking about a thread to discuss what the next version of the 28 pin board should look like, what everyone would want on a small board (and hopefully the Wiz would make available). If Geoff is going to put the USB back on the chip with the expanded resources of the MX170, it would probably make sense to wait to lay out a designed-by-committee board most everyone would want. Lou Microcontrollers - the other white meat |
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Zonker Guru Joined: 18/08/2012 Location: United StatesPosts: 767 |
Way to go Mick...! See, this is the kind of stuff need. If more people got a cheap version of a CAD system going at home, and would crank out small runs of more "application specific" types of things, we could trade them back and forth and get more things going... Heck, if you keep the PCB size down, you could even do most things with the free version of Eagle CAD or other programs that offer free or "student" versions of the software... I would still like to create a PCB for the uMite IR remote... Maybe later on after things settle down a bit here... Keep on thinkin Gents... It's all about havin FUN..!! 
EDIT: WOW... Just had a look at that software Big Mick got... Nice..!!! Makes me wonder why I spent $1000 on the Eagle package... I think I'm hooked... I will give this a go... Thanks Mick..!! EDIT: Just bought it and got it installed... Damn Nice... To late tonight to play with it...  ... Will start playing and installing more parts Lib's soon...
@Lou.. Take a look at this... It's $50 and looks AWESOME... |
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| JohnL Senior Member Joined: 10/01/2014 Location: SeychellesPosts: 128 |
Hi Mick, On PCB C1 -ve terminal is connected to pin 20 header, should be connected to pin 19 GND. Can you add SMD pads for passive components R1-R3 C2,C3, just as another mounting option. Leave existing holes. I would be interested in a few boards 10+ subject to price, will send you PM. |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2950 |
Hi Lads, Just got back from a day trip to The Big Strawberry and Wow, I am amazed at the interest.. I was only thinking of myself when I did the board, OK.. Jman... The header pinout I chose was to suit the FT23xx adapter I bought off ebay, I have a few different brands etc and they are ALL different, I figured a header cable is easy anyway and may be as little as 3 wires so was no real problem.. If enough agree I am happy to change the pinout to suit people requirements. Lou.... The TO-92 device would fit ( in the to-220 hole) but a slight bending of the legs to swap pin 2&3 would be needed.. but could be done easilly enough. Zonker... Yes I am very impressed with AUTOTRAX DEX, now that I have been using it for a week or so.. It took a bit to `unlearn' PROTEL but I actually love it.. And it is a full package not a restricted size version.. I tried to use eagle but didnt like it. Autotrax wasnt as easy to get into as I thought but now I am I love it.. JohnL.... What you are seeing is a decision I made in the design.. I figured you would never actually connect to the +ve side of the Cap so I made the relevant pins of J5 (pins 5 and 6) BOTH connected to GND so the connection to C1 -ve does go to GND and the +ve side ONLY goes to the chip and not the header J5. All that aside I have just seen that C1 needs a positive symbol on the overlay. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| Lou Senior Member Joined: 01/02/2014 Location: United StatesPosts: 229 |
Hi Mick, Fine business on the TO-92 fitting the TO-220 holes, and a header cable for J2 will work in all cases - you have all the signals needed right there. Throw in some popcorn in on your juggling act and get some video we can all enjoy. 
I'm with Zonker, Autotrax looks great especially for 50 bucks !! Lou Microcontrollers - the other white meat |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
Hi Mick, Looks great for module builds - would you put me in for three to five (four  ) please.
Given you're open to suggestions how about having it optionally take the SOIC version of the 150 (under the DIP) and with the room left over , a spot for an optional SMD clock. With JohnL's SMD passive pad 'extensions' you'd just about have a full SMD alternative.
Greg |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2950 |
Hi Lads, I am not sure what postage costs are with iTeadStudios.. Zonker how much postage was on your deal, if I may ask? But on 50mm x 50mm works out at $1US per PCB If postage adds another $1US I would guess a suitable cost would be about $3AUS each.. Postage in Australia could be in a standard envelope (unless larger orders). so about $1, Factoring in PAYPALs fees I reckon in AUS could be $4Aus posted and maybe cheaper for 10 off.. Figures could be finalised if and when there is a demand and a product to supply. Whilst I have put a copyright (c) on the PCB, I have no problems with anyone using the design for themselves and if someone produced them and sold them I would not be in a position to chase them anyway, not that it would be worth it to do so... I dont think I could get rich on this one.. I dont want to profiteer, but a $1 or so for a beer or 2 never goes astray. I will see if I can squeeze in a To-92 footprint for the LP reg. Mind You I bought 20 of the surface mount LM1117 from ebay for about $3.. so I would suggest that might be a better option Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2945 |
Zonker, Just to let you know that your Module & PCB arrived here yesterday on this half of the planet.
They look well nice; and I will have a little play with them later today. Thanks for supplying these . . .  |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2945 |
Bigmik, iTead shipping was $25 on my initial parcel (ten x 10cmx5cm panels). However you also need to pay customs duty (or should) and this was another 20% of the order value (for UK rates). Not sure what quantity you are thinking about but for small volumes you are better of panellising your design but note you can't put more than 5 PCBs on one panel (so they say). With high volumes then the cost drops right down but you do need to ensure demand to make it worth while! I think your allowance of $3 per PCB is very sensible but DO check out customs rates first! Regards, WW |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2945 |
As previously mentioned, lets do this guys to see what suggestions are out there . . . . |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2950 |
Hi Greg, Certainly, all and any suggestion is welcome... May not be implemented but welcome.. Firstly, I am trying to stay away from SMD as much as I can.. OK I used a SMD Cap, basically because you more or less have to.. And I used a SMD Volt reg as I had them in stock.. I think another PCB that is entirely SMD would be a better idea.. I reckon you could make a very small PCB with all you need... Also, I am not sure what you mean by JohnL's SMD passive Pad extensions. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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BobD Guru Joined: 07/12/2011 Location: AustraliaPosts: 935 |
No duty payable for entry into Australia unless stated value exceeds AU$1000. The guvvamint reckons the cost of collection value is higher than amount collected. |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2945 |
Ha - I like that one!
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| Zonker Guru Joined: 18/08/2012 Location: United StatesPosts: 767 |
Sorry Gents for being away for awhile... Was helping a friend move to a new apartment.. I looked up the ITead order... Small Batch 2Layer PCB 5cm x 10cm Max PCB Qty100pcs PCB Color Green PCB Thickness 1.6mm Surface Finish HASL Copper Thickness 1oz E-test 100% e-test IM120418014 1 $132.00 Subtotal $132.00 Shipping & Handling $31.02 Grand Total $163.02 Thank you, ITead Studio |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2945 |
Zonker, Did you have to pay any customs duty on the shipment from iTead? Or like BobD says for Australia, do the American officials not bother collecting it either? I selected DHL as the courier and it was DHL that collected the Customs duty here. Which courier did you select out of interest? Thanks for your reply . . . |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2950 |
Lads, There shouldnt be any customs payable in AUS but I I ship any overseas I cant guarantee what Customs in other countries will charge, Those freight costs seem rather high for small batches of PCBs. Whilst I havent yet scanned the circuit for errors, Holidays and family stopping me enjoying myself  ... I have sent off an RFQ to my (most recent) PCB Fab house (sitopway.com) So I would have a better idea of costings and what I can on charge them for.
I have looked and it would be easy enough to fit the LP Mchip VReg.. Now a noobie question... Is there anything special about the Mchip Vreg I need to cater for besides a cap either side? Regards, Mick Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2945 |
If using MCP170x then no special requirements other than caps. They are my LDO of choice and I have used in numerous circuits without any issues. . . . |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
An all SMD board - yes you're probably right there - it was just that the DIP versions were a bit scarce a while ago and I know TZ uses some 25 pin SOIC's and I have a couple of them. Re 'pad extensions for passive components' - I meant current passive pads could have a pad 'added' to them (like on top) that would take SMD caps and resistors as through-hole alternatives. Some people have set themselves up to use just SMD components and they could use the board too then, but I think you're right, another all-SMD board would be a better option. Greg |
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