[chbot] Chchrobotics Digest, Vol 22, Issue 9

[Gary T]

> >------------------------------
> >
> >Message: 3
> >Date: Sun, 5 Jul 2009 16:49:46 +1200
> >From: Paul Davey <plmdvy at gmail.com>
> >Subject: Re: [chbot] Parallax Prop Plug
> >To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
> >Message-ID:
> >         <9430ad070907042149u2abf1989maaed3946118864a5 at mail.gmail.com>
> >Content-Type: text/plain; charset=ISO-8859-1
> >
> >should be a 3.3v serial with DTR "not"ed to the reset line so that the
> >PC can trigger a reset.
> >
> >should be able to use a standard serial port with a level converter yes?
>
>
>
> > >
> > >Hi Gary,
> > >
> > >I found a schematic for the Sanguino here:
> > >http://sanguino.cc/1-0kitassembly
> > >
> > >Your modified prop plug will need a pin out adaptor to work with the
> > >Sanguino as the pin out is a little different, otherwise it looks like it
> > >will be fine.
> > >
> > >Richard
> > >
> > >On Sat, 04 Jul 2009 09:48:18 +1200, Gary T <grogyan at woosh.co.nz> wrote:
> > > > Hello,
> > > > I'm looking for some help on a small problem, i've got a Propeller
> > > > Prop Plug from Parallax, modded to enable programming with a
> > > > BasicX24, but i'm beginning to work with the Arduino boards.
> > > > The board I have doesn't natively support USB and requires a USB to
> > > > TTL converter, rather than me buying another converter, would anyone
> > > > know if a modded Prop Plug will work alright with it?
> > > >
> > > > The board I have is a Sanguino.
> > > > The mod in question involved removing a capacitor and putting in a
> > > > 150R resistor
> > > > http://www.zbasic.net/forum/attachments/files/dscn4391a_616.jpg
> > > >
> > > > Parallax Prop plug
> > > >
> > >http://www.parallax.com/Store/Microcontrollers/PropellerTools/tabid
> > /143/ProductID/398/List/0/Default.aspx?SortField=ProductName,ProductName
> > > >
> > > > Thanks
> > > >
> > > >
> > > > Gary T
> > > >
> > > >
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> > >End of Chchrobotics Digest, Vol 22, Issue 7
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> >End of Chchrobotics Digest, Vol 22, Issue 8
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>------------------------------
>
>Message: 2
>Date: Tue, 7 Jul 2009 07:48:21 +1200
>From: Charles Manning <cdhmanning at gmail.com>
>Subject: Re: [chbot] Chchrobotics Digest, Vol 22, Issue 8
>To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
>Message-ID:
>         <2e228380907061248l4f87b8ddg8451d8f9afac9b75 at mail.gmail.com>
>Content-Type: text/plain; charset=ISO-8859-1
>
>I'm a bit confused as to what the Prop Plug is doing.
>Is it just being used as TTL leve serial to USB adapter (ie replacing
>RS232 drivers + USB to RS232 adapter) or is it being used as a ISP
>programmer?
>
>Assuming for a moment that you're using it as a serial to USB adapter,
>there does seem to be a slight issue. The prop plug reset is open
>collector and the sanguino reset line is driven through a capacitor.
>That would indicate that the sanguino needs to have an active driver
>(since the capacitor defeats an OC driver).. You can probably achieve
>this by putting a 1K resistor between 5V and the prop plug reset line.

I had a brief thought that maybe one of the other lines need toggling 
today, but after reading your suggestion I had a closer look at the schematic.

The !Reset line is being held high on the board, with a physical 
switch to pull it into reset mode.


Face-palm, doh!
Its one of those moments when you could just kick yourself,

Looking ever closer at the schematics of the prop plug and Sanguino 
board, its the RTS line that should be toggled, not the DTR which the 
prop plug uses.
So i'm not too sure how I can mod it, if I can mod it, by taking the 
pin from the connector and somehow solder it to a QFN package.
This is still quite pointless as i'm using a manual switch for reset.

>When you say "not working" what do you mean? There are a few things
>that need to be right: resets, signal driving, baud rate,...

I mean that the Arduino software doesn't know how to get the prop 
plug talking with the Sanguino.

If I can't resolve this, then i'll get a more compatible cable, which 
I just feed in with my next order of parts for my project.

Cheers


Gary T