22 Dec
2013
22 Dec
'13
7:51 p.m.
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(a)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=…
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?
