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1  Using Arduino / General Electronics / Re: Transistor Issue Plagues Me on: May 06, 2012, 02:36:07 am
I have used IRL640PBF mosfets to drive fair size motors with an arduino.
These are logic level drive devices. Take a look at the gate threshold voltage in the datasheet, this gives a good clue to their suitability for low voltage use.
2  Community / Exhibition / Gallery / Re: Acrob - Arduino compatible robotic board on: March 28, 2012, 03:44:16 pm
Thanks!  Nice neat schematic
3  Community / Exhibition / Gallery / Re: Acrob - Arduino compatible robotic board on: March 27, 2012, 06:55:27 am
Can you embed the components in the gschem schematic? I don't use the geda libraries.

Edit : I should have said,  embed the symbols
4  Using Arduino / General Electronics / Re: Multiplexing serial tx/rx lines on: March 11, 2012, 02:22:48 am
Thanks, I already had started designing a board with a 74HC151 for the tx lines but I got fed up trawling data sheets looking for something to do the rx.



Edited 1 typo.
5  Using Arduino / General Electronics / Multiplexing serial tx/rx lines on: March 10, 2012, 05:49:46 pm
I need to connect  eight   5 Volt ttl serial rfid readers onto the tx/rx pins. Has anybody got any examples of this being done? or any suggestions  for suitable chips to make the job as simple as possible. 
6  Using Arduino / Project Guidance / Re: my external watchdog circuit for Arduino on: March 03, 2012, 03:35:29 pm
I think my less than 1 week memory span is causing me to post garbage again.

If the watchdog times out,  it resets the chip with the watchdog timer set to a fast reset time, this is what causes the problem with the watchdog/bootloader looping continuously, and making reprogramming the chip all but impossible.

 However, if the chip is powered down and restarted, the bootloader does operate correctly because the watchdog has not yet been enabled in setup().

7  Using Arduino / Project Guidance / Re: my external watchdog circuit for Arduino on: March 03, 2012, 01:20:17 pm
I posted this a while ago, http://arduino.cc/forum/index.php/topic,92785.0.html and I can confirm that it works with the
new bootloader.

This http://tushev.org/articles/electronics/48-arduino-and-watchdog-timer was all the info I needed.


Edit : Don't try this with any other bootloader because you will need a microsecond accurate finger on the reset button to reprogram the chip again afterwards smiley
8  Using Arduino / Project Guidance / Re: Advanced DRL driver on: February 28, 2012, 08:08:54 am
What are R1 & R2 for?
9  Using Arduino / Installation & Troubleshooting / Re: Broken off pins in the headers :( on: February 25, 2012, 01:48:56 pm
A picture to prove it 



10 seconds to remove the header and 1 hour to remember how to post a picture  smiley-grin
10  Using Arduino / Installation & Troubleshooting / Re: Broken off pins in the headers :( on: February 25, 2012, 12:45:37 pm
If you can get a thin screwdriver under the ends of the plastic part of the header and gently lever it up it will come off easily and leave all the pins still soldered in the board. The broken off pin can then be removed easily. Replace the plastic and everything is as good as new.
11  Using Arduino / Installation & Troubleshooting / Re: Uploading through an USB hub. on: February 24, 2012, 01:34:41 pm
And just to confuse the issue even more, all my Arduino stuff connects fine when connected to a powered hub but an AVR Dragon doesn't, nor does my digital camera. Some items are finicky.
12  Using Arduino / Microcontrollers / Re: Arduino and ATMEGA644 - DIP 40 PINS - 64k Flash on: February 22, 2012, 04:04:30 pm
Take a look at the Sanguino http://www.sanguino.cc

The info here is a bit out of date but it is a start. I have used a lot of 644 chips and they work fine.
13  Using Arduino / Microcontrollers / Re: Optiboot + watchdog on: February 20, 2012, 06:04:45 am
Thanks. I have just done a 6 hour round trip to power cycle a piece of kit (not an Arduino) that was freaked out by adjacent high frequency interference. Not much fun.
14  Using Arduino / Microcontrollers / Re: Optiboot + watchdog on: February 19, 2012, 11:39:01 am
Just found on the google code optiboot website
Quote
Adaboot performance improvements. Optiboot runs your sketches sooner, with no watchdog issues.

So I guess it is ok.
15  Using Arduino / Microcontrollers / Optiboot + watchdog on: February 19, 2012, 11:18:02 am
I have tested this and everything seems to be fine but can anyone confirm that the optiboot bootloader supplied with v1.0 of the ide works with the watchdog timer enabled on a mega328. Thanks.
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