[sudo-discuss] Sudouino328 PCB Design

[Hol Gaskill]

Hey Jake,

No FTDI chip onboard for this one, just shown on the attachment to help lay out the connections which are 6-pin TTL serial.  I'd like to keep everything through-hole for the first sudouino so it can work as a kit for newbies, and since I personally don't even know how to SMD solder, all the work done on it so far assumes no SMD components.  I remember encouraging you a few weeks ago to take the lead for the sudouino 2 board around the ATMega32U4 as you've suggested using this chip previously.  I think there are many cool things that can be done with it, so I look forward to seeing what you come up with to accompany that chip.  In the meantime I'll continue work with the 328p as planned in order to bring this board online as soon as possible.  

As far as connectors, I probably won't use any myself and I think we should sell some boards without them.  I do agree with Steve on having an option for screw terminals for the switched loads, and either a screw terminal or a barrel jack for DC power input to the board.  Whatever we think would be the most popular, I'll space the holes accordingly so the PCB design will accommodate either way. So it looks like we're up to 8+ different packages based on 3 different choices  - 3,3V / 5V, kit / pre-assembled, bare holes / terminals.

What kind of connectors would the most people use for power in and out?

Cheers,
Hol


Dec 22, 2013 12:47:17 PM, jake at spaz.org wrote:
Hi Hol,
>
>I have lots of opinions and advice about this design, but i would like 
>more info about the state of the project first.  For example i am curious 
>whether this thing will have a USB port or use the 6-pin serial header 
>like a Boarduino.
>
>I have a bunch of Atmega32U4 chips that you can use for this project. 
>True that they are surfacemount but it's not harder to do than 
>through-hole, in fact it can be much easier even for newbies.  I have 
>syringes of solder paste, although it can be done with regular solder 
>easily.
>
>here's a video of someone doing it with hot air (note:  they fool around 
>with the narrow stream of hot air, but you can just do it in a blast with 
>a regular hotair gun in much less time)
>http://www.youtube.com/watch?feature=player_detailpage&v=2Z7nCAxS2Rg#t=548
>
>the nice thing about the atmega32U4 chips (besides the fact that I will 
>donate them to the project for free) is that they have native USB, which 
>means your boards can plug straight into a computer like an arduino 
>leonardo.  Also they will be able to pretend to be other devices, like a 
>keyboard, mouse, printer, disk, or whatever you want.
>
>specifically about the SAE connectors, I am against them.  I think the 
>board should just have 1/8" holes for wires to be soldered into.
>
>-jake
>
>Hol wrote:
>Almost done w/ PCB design.  That's an ATMega328p processor and a ULN2003 
>for power output up to 3.5 amps out of the box.  Still need to add some 
>connectors for I2C and 12V, 5V.  I usually use SAE connectors 
>http://www.vetco.net/catalog/images/G-QD-10-2.jpg for my 12V loads but we 
>could solder on a barrel jack, or just ship it with holes for DIY 
>soldering of connectors.  Suggestions?
>
>