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1  Forum 2005-2010 (read only) / Syntax & Programs / Codebumping and the arduino bootloader on: November 07, 2006, 04:31:30 pm
I have two questions really

1st I am unfamiliar with the bootloader that arduino uses, is there a way to bump down the code one a .hex file to make room for the arduino bootloader?  How big is the bootloader?

2nd  Is there a way to load a hex file compiled with gccavr (1-wire support) from a standalone app like hyperterm or from the arduino sketchbook?




2  Forum 2005-2010 (read only) / Interfacing / Re: Arduino and 1-wire on: October 27, 2006, 09:56:24 pm
Not alot of help on that one,   the hardware connects are correct but there is not much in software.  I have found WinAVR had built in 1-wire support,   but I dont yet know if its possible to load a WinAVR hex file using the arduino bootloader.   Im gonna have to do a little more research.
3  Forum 2005-2010 (read only) / Interfacing / Re: Arduino and 1-wire on: October 24, 2006, 04:13:42 pm
I have found a site with 1-wire support for the atmega16,   with source

http://gandalf.arubi.uni-kl.de/avr_projects/tempsensor/index.html


Does anyone know how I might integrate this with the arduino IDE

or am I barking up the wrong tree,  

I am pretty good with the hardware but I am fairly poor with the software stuff
4  Forum 2005-2010 (read only) / Interfacing / Arduino and 1-wire on: October 22, 2006, 05:46:33 pm
Has anyone tried connecting to a dallas 1-wire temperature sensor yet?


looking for tips on it

DS18B20 is the sensor
5  Forum 2005-2010 (read only) / Interfacing / Re: AC Light Dimming on: January 19, 2011, 03:54:43 pm
Still working on this,   out of curiosity what would be required to run on 220V AC?
6  Forum 2005-2010 (read only) / Interfacing / Re: AC Light Dimming on: November 29, 2010, 12:07:19 pm
Very cool,  thank-you very much.  

I will reply back with the results if I don't turn myself into a cinder.

  
7  Forum 2005-2010 (read only) / Interfacing / Re: AC Light Dimming on: November 29, 2010, 11:43:43 am
Can a BTA20 be dropped in place of the BTA10 to provide more amperage.

I need to control several 2kw heating elements
8  Forum 2005-2010 (read only) / Interfacing / Re: 1-wire on: October 23, 2006, 06:16:15 pm
Thanks   smiley


I have a thread running in the software interface section now.

9  Forum 2005-2010 (read only) / Interfacing / Re: 1-wire on: October 23, 2006, 01:22:22 pm
The rreason they are so very very useful is that several dozen or even hundreds can exist on a single digital pin, and they can be placed any distance away from the processor (within reason) and not suffer any ill effects from the buildup in wire resistance.    

So instead of 4 or 5 analog thermistors connected near to the board you can have 100 and never use more than 1 digital pin to do it.


each sensor is individually addressable using its 64bit address


10  Forum 2005-2010 (read only) / Interfacing / Re: 1-wire on: October 22, 2006, 01:31:34 pm
1-wire is a bus networking system from Dallas semiconductor.

it is a thermistor attached to a its own A/D converter,

http://www.maxim-ic.com/1-Wire.cfm  


and the sensor I was talking about is here

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2812
11  Forum 2005-2010 (read only) / Interfacing / 1-wire on: October 22, 2006, 11:49:49 am
I have a bunch of these 1-wire temp sensors from a dead PIC project.  


Any ideas on how I may interface them to one of the Arduino boards

DS18B20 is the temp sensor


12  Forum 2005-2010 (read only) / Interfacing / Re: peltier element on: October 22, 2006, 04:49:29 pm
use an h-bridge with a temperature sensor attached for monitoring

an h-bridge will allow you to turn it either hot or cold (reverse polarity) using 2 pins


Its the same type of component that allows forward and reverse on a motor only no protection diodes are needed since its not an inductive load.

Here is an example for a motor using only 2 pins (I would use a couple more transistors to make sure both couldnt be in the on state at the same time as that would likely cause smoke

http://www.bobblick.com/techref/projects/hbridge/hbridge.html

or a possibly more effecient design using MOSFETS here

http://www.cadvision.com/blanchas/hexfet/np-s.pdf

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