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hellocatfood  
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 More options Jun 14 2010, 9:52 am
From: hellocatfood <bv3...@gmail.com>
Date: Mon, 14 Jun 2010 06:52:21 -0700 (PDT)
Local: Mon, Jun 14 2010 9:52 am
Subject: Arduino Hack Session?
At the most recent session we discussed the possibility of having an
Arduino themed hack session. Is it something you'd want to do?

Also, what could we do or build as part of it? Answers on a
postcard...

Ant


 
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Dave Nash  
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 More options Jun 14 2010, 10:27 am
From: Dave Nash <plainn...@gmail.com>
Date: Mon, 14 Jun 2010 07:27:15 -0700 (PDT)
Local: Mon, Jun 14 2010 10:27 am
Subject: Re: Arduino Hack Session?
Hi all, new here but I'm moving to Birmingham for university in
October so I might as well make an input now.

I doubt I'll be able to get the time off to come down, but http://roguescience.org
have a very interesting tutorial working through the basics of a MIDI
controller on the Arduino, I did it the other night and it'd be quite
easy to build a workshop on.

Dave

On 14 June, 14:52, hellocatfood <bv3...@gmail.com> wrote:


 
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genzaichi  
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 More options Jun 15 2010, 9:45 am
From: genzaichi <genzai...@googlemail.com>
Date: Tue, 15 Jun 2010 06:45:28 -0700 (PDT)
Local: Tues, Jun 15 2010 9:45 am
Subject: Re: Arduino Hack Session?

I think at some stage - although probably not this time around - we
should do a workshop (ie buying the components in in bulk) that goes
through building your own bare-bones Arduino board and programming the
chip.

Kind of an amalgamation of
http://www.instructables.com/id/Standalone-Arduino-ATMega-chip-on-bre...
and
http://arduino.cc/en/Tutorial/ArduinoISP
and then getting it soldered onto stripboard.

I've just done a calculation based on buying components for 50-off and
the cost of components looks like being about £4-5 per 'board'.
Definitely worth it if, like me, you've reached the stage where you're
using the Arduino platform a lot for projects and don't want to use a
£25 proper board each time!

nikki


 
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Andrew Nixon  
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 More options Jun 16 2010, 7:07 am
From: Andrew Nixon <andrewnix...@gmail.com>
Date: Wed, 16 Jun 2010 12:07:15 +0100
Local: Wed, Jun 16 2010 7:07 am
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?
Totally agree with Nikki. I for one would like to be able to get my  
head round the arduino a bit more. As for an arduino session I like  
that idea too but aren't quite imaginative enough to come up with a  
good way to spend the evening.

Andrew.

Sent from my iPhone

On 15 Jun 2010, at 14:45, genzaichi <genzai...@googlemail.com> wrote:


 
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hellocatfood  
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 More options Jun 16 2010, 8:44 am
From: hellocatfood <bv3...@gmail.com>
Date: Wed, 16 Jun 2010 05:44:50 -0700 (PDT)
Local: Wed, Jun 16 2010 8:44 am
Subject: Re: Arduino Hack Session?
So it sounds like more of a tutorial environment is needed, not just a
free-for-all. Next question is, are there any Arduino experts in the
house who'd want to lead a session?

Ant

On Jun 16, 12:07 pm, Andrew Nixon <andrewnix...@gmail.com> wrote:


 
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genzaichi  
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 More options Jun 16 2010, 11:48 am
From: genzaichi <genzai...@googlemail.com>
Date: Wed, 16 Jun 2010 08:48:34 -0700 (PDT)
Local: Wed, Jun 16 2010 11:48 am
Subject: Re: Arduino Hack Session?
How about a P2P middle route where people find an online tutorial or
project to work through together.

http://www.instructables.com/technology/arduino/
http://www.freeduino.org/
etc or the midi one Dave liked the look of

People can pool resources when it comes to buying components, problem
solving and enthusiasm levels.

I haven't really mastered the basics yet, but have managed to bluff my
way through more advanced stuff to make projects happen!

I could do with chums to work through either:
* some basics such as Earthshine Designs Arduino Starter Kit tutorials
* multiplexing - for lots of blinky lights
* or using Arduino to control bigger stuff. (I think this involves
transistors)

nikki

On Jun 16, 1:44 pm, hellocatfood <bv3...@gmail.com> wrote:


 
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Andrew Thomas  
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 More options Jun 16 2010, 2:33 pm
From: "Andrew Thomas" <andrewmarktho...@yahoo.com>
Date: Wed, 16 Jun 2010 19:33:35 +0100
Local: Wed, Jun 16 2010 2:33 pm
Subject: RE: [birmingham-hack-space] Re: Arduino Hack Session?
Hi,

If you want something to start off using transistors then a very good guide
was in nuts'n'volts magazine:

http://www.parallax.com/Resources/NutsVoltsColumns/NutsVoltsVolume1/t...
4/Default.aspx

It's Column #6, Silicon Steroids for Your Stamp. All the other nuts'n'volts
articles there are good for lots of beginner topics.

Best wishes,

Andrew.


 
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Aaron Shrimpton  
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 More options Jun 16 2010, 6:36 pm
From: Aaron Shrimpton <aaro...@gmail.com>
Date: Wed, 16 Jun 2010 23:36:36 +0100
Local: Wed, Jun 16 2010 6:36 pm
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?
I'm interested in pooling resources to buy components, especially for
bare bones / special purpose Ardunios

At the moment I'm trying reducing the power consumption of an ardunio
based sensor platform, hopefully to within the realms of small solar
panel.

I've implemented a breadboard ardunio before so I might be able to
help people with that.

Aaron

On Wed, Jun 16, 2010 at 7:33 PM, Andrew Thomas


 
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genzaichi  
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 More options Jun 17 2010, 2:36 am
From: genzaichi <genzai...@googlemail.com>
Date: Wed, 16 Jun 2010 23:36:43 -0700 (PDT)
Local: Thurs, Jun 17 2010 2:36 am
Subject: Re: Arduino Hack Session?

I'll be ordering components soonish through our friends at Aston, so
if people speak up with a rough idea about how many sets they might be
interested in I can factor that in.

It's very bare bones:
*Chip
*Socket
*Voltage regulator
*Crystal
*2 pairs of capacitors
*battery connector
and a few other bits and bobs like battery clip and power led

I've thus far used one (breadboarded) with this set-up to drive the
Secret Knock in the Box, and will be using a load more soon on a PCB
version.

The chips are blank and will need the bootloader putting on which I'll
either be doing at Aston with their AVR programmers or with another
Arduino board. Or probably a combination of both, 'cos I definitely
want to try the latter.

I/we can probably make a build-your-own-arduino session happen if a
gang of people register their interest ahead of time. Are you in,
Andrew N, Aaron?

nikki

On Jun 16, 11:36 pm, Aaron Shrimpton <aaro...@gmail.com> wrote:


 
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Aaron Shrimpton  
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 More options Jun 17 2010, 3:28 am
From: Aaron Shrimpton <aaro...@gmail.com>
Date: Thu, 17 Jun 2010 08:28:23 +0100
Local: Thurs, Jun 17 2010 3:28 am
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?
Yep I'm in for around 8 sets, without voltage regulator or crystal.


 
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Andrew Nixon  
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 More options Jun 17 2010, 6:37 am
From: Andrew Nixon <andrewnix...@gmail.com>
Date: Thu, 17 Jun 2010 11:37:52 +0100
Local: Thurs, Jun 17 2010 6:37 am
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?
I would like a set. Think I only need one at the moment.

Thanks,

Andrew (N)

Sent from my iPhone

On 17 Jun 2010, at 08:28, Aaron Shrimpton <aaro...@gmail.com> wrote:


 
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Andrew Thomas  
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 More options Jun 17 2010, 6:42 am
From: "Andrew Thomas" <andrewmarktho...@yahoo.com>
Date: Thu, 17 Jun 2010 11:42:35 +0100
Local: Thurs, Jun 17 2010 6:42 am
Subject: RE: [birmingham-hack-space] Re: Arduino Hack Session?
Hi,

Sorry to be stingy: I'd be interested in one (plus maybe a spare avr chip,
just in case). I'm with Aaron on trying to make a very low power arduino,
that would be very nice :-)

Best wishes,

Andrew.


 
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hellocatfood  
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 More options Jun 17 2010, 11:58 am
From: hellocatfood <bv3...@gmail.com>
Date: Thu, 17 Jun 2010 08:58:17 -0700 (PDT)
Local: Thurs, Jun 17 2010 11:58 am
Subject: Re: Arduino Hack Session?
So, it looks like a build-your-own Arduino session? Do we have a date
in mind for making it happen? How long would it take to get components
in?

Ant

On Jun 17, 11:42 am, "Andrew Thomas" <andrewmarktho...@yahoo.com>
wrote:


 
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genzaichi  
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 More options Jun 17 2010, 1:57 pm
From: genzaichi <genzai...@googlemail.com>
Date: Thu, 17 Jun 2010 10:57:08 -0700 (PDT)
Local: Thurs, Jun 17 2010 1:57 pm
Subject: Re: Arduino Hack Session?
I've a meeting late next week when I can discuss ordering the
components and maybe some AVR programming.
Will have a think about dates for the hack session after that. Won't
take very long for components to arrive once they've been ordered.

Aaron, Andrew T, have you seen this?
http://hcgilje.wordpress.com/resources/arduino-standalone/
Any use?

Also, Andrew, thanks for the Nuts and Volts link. Here's a shortened
url in case anyone else who was having trouble with the long link
getting truncated:
http://is.gd/cT4uz (.pdf)

On Jun 17, 4:58 pm, hellocatfood <bv3...@gmail.com> wrote:


 
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Andrew Thomas  
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 More options Jun 17 2010, 3:14 pm
From: "Andrew Thomas" <andrewmarktho...@yahoo.com>
Date: Thu, 17 Jun 2010 20:14:30 +0100
Local: Thurs, Jun 17 2010 3:14 pm
Subject: RE: [birmingham-hack-space] Re: Arduino Hack Session?
Hi,

Thanks, that's an interesting link. I might try it when you do the
arduinohackshop.

I was thinking (dangerous I know) that a simple avr programmer shouldn't be
more that a tenner, and lots of people might find it useful, so would it be
a good idea if fizzpop got one to go with its other tools? Just a thought
(and maybe fizzpop could make some pin money selling bootloader enabled
chips :-)

Best wishes,

Andrew.


 
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Aaron Shrimpton  
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 More options Jun 17 2010, 4:51 pm
From: Aaron Shrimpton <aaro...@gmail.com>
Date: Thu, 17 Jun 2010 21:51:18 +0100
Local: Thurs, Jun 17 2010 4:51 pm
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?
That is a good link, I didn't realize that the original Lilllpad boot
loader had a long reset delay.

A fizz pop avr programmer sounds like a good idea it'd probably get
quite a lot of use.

On Thu, Jun 17, 2010 at 8:14 PM, Andrew Thomas

...

read more »


 
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genzaichi  
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 More options Jun 19 2010, 2:11 pm
From: genzaichi <genzai...@googlemail.com>
Date: Sat, 19 Jun 2010 11:11:18 -0700 (PDT)
Local: Sat, Jun 19 2010 2:11 pm
Subject: Re: Arduino Hack Session?

Yeah, sounds like an AVR programmer would be worth investing in. I'll
check at Aston next week to see what they're using and if we can get a
good price on one. The others I've seen seem to start from about the
£15/£20 sort of mark.

Do you guys want to have a look 'round and see what sort of thing
would meet your needs, 'cos I have no knowledge of this sort of thing.

I have however successfully done this
http://www.instructables.com/id/Standalone-Arduino-ATMega-chip-on-bre...
and http://arduino.cc/en/Tutorial/ArduinoISP now, so that bodes well
for how simple it must be! :)

Neither of them take particularly long, so might be worth combining
with looking through low power options and I think I've seen something
about a sleep function somewhere too that might fit in with this vein
of thinking...

nikki

On Jun 17, 9:51 pm, Aaron Shrimpton <aaro...@gmail.com> wrote:

...

read more »


 
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Andrew Thomas  
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 More options Jun 19 2010, 6:15 pm
From: Andrew Thomas <andrewmarktho...@yahoo.com>
Date: Sat, 19 Jun 2010 23:15:12 +0100
Local: Sat, Jun 19 2010 6:15 pm
Subject: RE: [birmingham-hack-space] Re: Arduino Hack Session?
Hi,

Sleep mode is pretty much a feature of most microcontrollers. The biggest problem is that to use a2d a voltage regulator is normally needed (although for some things I think avr's have an internal 1V ref), so the power supply can waste power when sleeping. It could be quite interesting to try to make a very low power arduino, and using 8mhz like in your link would help.

I can have a quick search for a programmer if needed. However, are you thinking of a cheap avr in-circuit cable, or a better zif socket multi-purpose programmer? My experience is that the latter is worth the extra cost, especially if you want flexibility for hacking, workshops, etc.

Best wishes,

Andrew.


 
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Aaron Shrimpton  
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 More options Jun 20 2010, 9:28 am
From: Aaron Shrimpton <aaro...@gmail.com>
Date: Sun, 20 Jun 2010 14:28:15 +0100
Local: Sun, Jun 20 2010 9:28 am
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?
Andrew is right, the biggest problem is the voltage regulator. In some
of the tests I've done the regulator accounts for over 50% of the
sleeping power consumption.

I'm considering not using a regulator and measuring Vin
(http://code.google.com/p/tinkerit/wiki/SecretVoltmeter) before using
the a2d. If the 1V ref can be access externally that might be an even
better option.

The downside of not using a regulator is the Ardunio will be more
sensitive to small changes in supply voltage.

For the programmer I have the Avr V2 ISP which can be a bit of a pain
to use with breadboards but works very well.

On Sat, Jun 19, 2010 at 11:15 PM, Andrew Thomas


 
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G Bulmer  
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 More options Jun 20 2010, 9:48 am
From: G Bulmer <gbul...@gmail.com>
Date: Sun, 20 Jun 2010 06:48:58 -0700 (PDT)
Local: Sun, Jun 20 2010 9:48 am
Subject: Re: Arduino Hack Session?
The 'official' AVR programmer is
http://www.atmel.com/dyn/products/tools_card_v2.asp?tool_id=3808
it's about £38 from, e.g.
http://www.rapidonline.com/productinfo.aspx?tier1URL=Electronic-Compo...

I have one, and would bring it along to a meeting, for people to use
(but I'm in a flacky state of health, so I'm not very reliable). It
can program an 8-bit AVR, including ATtiny, and not just ATmega, so
handy if you want to make a smaller cheaper gizmo than an Arduino.

As Nikki says the Arduino can be used to program another Arduino.
The hardware programming interface is SPI, i.e. the AVR looks like a
very tiny flash memory. An Arduino can be an SPI master (when it's
doing the programming), or an SPI slave (when it's being programmed).
This should be able to program any AVR in theory, but I haven't
noticed if anyone has tried.

The folks at obdev developed USB for AVR, without needing USB
hardware; it's all done in software (extremely interesting, well worth
a look).
They developed a USB AVR programmer:
http://www.obdev.at/products/vusb/usbasploader.html
The license is restricted somewhat, you can make small quantities for
your own use, but not sell them.

The wonderful Ladyada, has developed something similar, but
unconstrained:
http://www.ladyada.net/make/usbtinyisp/index.html

The PCB's are $5+P&P from the USA, P&P was $11.64, so about $7.35 each
(remembering to keep under the VAT free £18 import limit)

The part cost is well under £5, except for the nifty case, which I've
only found in the USA.

If you look at the tutorial http://www.ladyada.net/make/usbtinyisp/solder.html
You can see that it is just about buildable on veroboard, though I
haven't tried. An awkward bit might be the USB socket, the ones I
bought aren't on a 0.1" pitch.

There are always AVR ISP's on eBay, this for example:
http://cgi.ebay.co.uk/USBASP-USB-AVRISP-AVR-ISP-Programmer-AVRDUDE-WI...
is $21. I can't vouch for it, I just did a quick search.

All of these approaches use an 'Atmel standard' 6 pin header, arranged
as a 2x3, so we could make an adapter out of a bit of veroboard to
make it easy to plug the 2x3 plug into breadboard, or as folks have
suggested, get a ZIF socket, and mount it on veroboard, or something.
E.g. http://www.rapidonline.com/Cables-Connectors/Connectors-Multipole/DIL...
which is £11.69 for 28-pin, which would be okay for an ATmega, and
with some thought, maybe, could be used for ATtiny too.

If folks wanted a reasonably stable and robust DIYduino, it could be
moved onto veroboard and soldered up, and their are a bunch of PCB's
available. I have an interesting single sided PCB a friend made for
me, which I could bring along.

Remember, this won't have USB, so it'll need a USB to serial cable,
the favourite is the FTDI ones, because they look exactly the same as
a normal USB Arduino, for example:
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=get...
which are quite expensive, about £18.

There is a much cheaper solution, which is to use a Nokia phone cable,
there are several, e.g. a DKU-5, which can be picked up for under £3
http://shop.ebay.co.uk/?_from=R40&_trksid=p3907.m570.l1313&_nkw=DKU-5...

An example of hacking a Nokia phone cable is here:
http://jethomson.wordpress.com/2010/02/21/diy-usb-to-serial-cable-for...

HTH GB

On Jun 19, 7:11 pm, genzaichi <genzai...@googlemail.com> wrote:

...

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G Bulmer  
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 More options Jun 20 2010, 10:01 am
From: G Bulmer <gbul...@gmail.com>
Date: Sun, 20 Jun 2010 07:01:24 -0700 (PDT)
Local: Sun, Jun 20 2010 10:01 am
Subject: Re: Arduino Hack Session?

As ever, Andrew is correct.
There are very, very few voltage regulators which use very little
power. Martin Barrat did a very good presentation on this very topic
at MINOS 2010, I think his slides are on micromouseonline.com.
Even the ones that claim to consume no current, actually need an
output load which do consume enough current to keep them operating
properly!

There is nothing to stop runing the Arduino directly off a battery
though.

The internal 1.1V reference that the ATmega microcontroller supplies
would be okay for small voltages. A problem is though, that higher
voltages will need some sort of voltage divider, to get the voltage
down to 1.1V, and a simple voltage divider using resistors would need
to be about 10K, and hence use a big fraction of a milliamp itself.

GB

On Jun 19, 11:15 pm, Andrew Thomas <andrewmarktho...@yahoo.com> wrote:


 
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G Bulmer  
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 More options Jun 20 2010, 10:24 am
From: G Bulmer <gbul...@gmail.com>
Date: Sun, 20 Jun 2010 07:24:14 -0700 (PDT)
Local: Sun, Jun 20 2010 10:24 am
Subject: Re: Arduino Hack Session?

On Jun 20, 2:28 pm, Aaron Shrimpton <aaro...@gmail.com> wrote:

> Andrew is right, the biggest problem is the voltage regulator. In some
> of the tests I've done the regulator accounts for over 50% of the
> sleeping power consumption.

Might be worth looking at Martin Barrat's slides?
http://micromouseonline.com/sites/default/files/minos10/minos10-barra...
though very low power wasn't his focus, he did suggest ways to reduce
the quiescent current.

> I'm considering not using a regulator and measuring Vin
> (http://code.google.com/p/tinkerit/wiki/SecretVoltmeter) before using
> the a2d. If the 1V ref can be access externally that might be an even
> better option.

Nifty idea, using the AREF!

Looking at the ATmega 48/88/168/328 document (doc8161),
especially "Figure 23-1. Analog to Digital Converter Block Schematic
Operation"

It looks like the internal reference voltage might be available on
AREF. There is just a MOSFET to disconnect it.
Neat.

> The downside of not using a regulator is the Ardunio will be more
> sensitive to small changes in supply voltage.

Big capacitor? It might need one anyway to store energy from the solar
cell, maybe?

I have a copy of "The Art of Electronics" which has a whole chapter on
micropower design, including some approaches to switching power itself
(I haven't read it though).
My health is a bit flacky, but I plan to bring it to a meeting for
Andrew T, so maybe have a glance then?

> For the programmer I have the Avr V2 ISP which can be a bit of a pain
> to use with breadboards but works very well.

Sounds little a bit of veroboard for a 2x3 pin adapter would be
handy :-)


 
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Andrew Thomas  
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 More options Jun 20 2010, 3:46 pm
From: "Andrew Thomas" <andrewmarktho...@yahoo.com>
Date: Sun, 20 Jun 2010 20:46:51 +0100
Local: Sun, Jun 20 2010 3:46 pm
Subject: RE: [birmingham-hack-space] Re: Arduino Hack Session?
Hi,

I seem to remember seeing in a magazine (?elektor?) ages ago a simple
regulating circuit that allows for a sleep mode. I think it was a little
chip and needed a capacitor and inductor (may have been a switch mode chip).
If I find it I'll let you know. I'll be very interested in Aaron's info on
power consumption and using an avr with just a battery :-)

I agree with Gary about a bit of veroboard. For my PicKit programmer I built
little veroboard adaptors for different microcontrollers, with a few header
pins to connect the two, and it worked quite well. Maybe if FizzPop got the
same one as Aaron we could put together a veroboard design for others to
copy (and maybe Aaron could teach us how to use it)?

Best wishes,

Andrew.

...

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Dave Nash  
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 More options Jun 20 2010, 4:03 pm
From: Dave Nash <plainn...@gmail.com>
Date: Sun, 20 Jun 2010 13:03:34 -0700 (PDT)
Local: Sun, Jun 20 2010 4:03 pm
Subject: Re: Arduino Hack Session?
I've had a quick look around for cheap programmers, and I've found
this:
http://fab.cba.mit.edu/content/projects/fabisp/
While it's only ISP and not got as many features as some of the other
suggestions, it might be worth etching a few boards (Or I'd be willing
to put in an order with BatchPCB if there's enough interest) so that
there's a few of them knocking around fizzPop.

On Jun 20, 8:46 pm, "Andrew Thomas" <andrewmarktho...@yahoo.com>
wrote:

...

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Adrian Godwin  
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 More options Jun 20 2010, 5:20 pm
From: Adrian Godwin <artgod...@googlemail.com>
Date: Sun, 20 Jun 2010 22:20:41 +0100
Local: Sun, Jun 20 2010 5:20 pm
Subject: Re: [birmingham-hack-space] Re: Arduino Hack Session?

There's alternate firmware for the Bus Pirate that acts as an AVR
programmer. A bus pirate costs a little more than some of the suggestions
but it does have other uses.

http://dangerousprototypes.com/bus-pirate-manual/
http://www.seeedstudio.com/blog/2009/12/09/bus-pirate-stk500v2-avr-pr...

Disclaimer - I have a bus pirate but haven't had any need to try that
firmware yet.

-adrian


 
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