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61  Forum 2005-2010 (read only) / Interfacing / Re: Switching Laser Module With Arduino on: March 02, 2010, 10:53:12 am
I may well be wrong on this, but I was not aware that glass is a significant IR block, unless specially coated..

UV, yes....
62  Forum 2005-2010 (read only) / Interfacing / Re: Grounding digital input 1 - dangerous? on: February 04, 2010, 07:40:01 am
Cheers - just wanted confirmation. It's going to be easier to re-route to another input than squeeze in another resistor...
63  Forum 2005-2010 (read only) / Interfacing / Re: Grounding digital input 1 - dangerous? on: February 03, 2010, 08:28:22 am
But if the bootloader is still in place (during my development/debug), does that not set the pin to output during it's "check if there's anything to upload" initialisation that happens before my code ever runs?  :-/
64  Forum 2005-2010 (read only) / Interfacing / Re: Grounding digital input 1 - dangerous? on: February 03, 2010, 07:25:34 am
Just to clarify - this would not be grounded on the Arduino, only on the target run-only PCB (which has no upload capability)

65  Forum 2005-2010 (read only) / Interfacing / Grounding digital input 1 - dangerous? on: February 03, 2010, 05:57:27 am
I have a design that uses 2 jumpered inputs for mode selection - the idea is that I turn on the internal pull-ups then selectively ground the inputs to give me a 4-way combo.

Laying out a PCB for it, the most convienient inputs would be 0 & 1 - but I was concerned since pin 1 is used as Tx output by the sketch loader, that when the programmed chip was in my PCB this pin will get set to output momentarily at some point, and therefore having it tied low would be bad....

Is that a correct assumption?

Ultimately the chip will be ISP programmed without the bootloader, but for now it's convenient to keep it in...

Cheers
66  Forum 2005-2010 (read only) / Exhibition / Re: K.I.T.T. Car Flashing Lights Pattern; Construction on: October 28, 2010, 06:41:39 am
A couple of improvement suggestions which can greatly increase the 'wow' factor you might like to consider

1) dynamically fade out the led rather than just setting discrete brightnesses. I recently made a standalone module for adding lighting effects to models and originally coded this up myself. Then I found the SoftPWM library which will do all the fading for you!

2) Use a sine wave calculation to detemine the horizontal position of the light - that way it slows down as it reaches either end of the sweep.

You can see both of these in a video of my prototype board here

http://s113.photobucket.com/albums/n202/ants-nest/Misc/?action=view&current=LEDDriver2.flv
67  Forum 2005-2010 (read only) / Exhibition / Re: UFO Lights on: December 10, 2009, 11:16:20 am
Thanks marklar

Yes exactly that - it measures the ambient at switchon, then waits for the reading to fall to half that to trigger the sequence.
68  Forum 2005-2010 (read only) / Exhibition / UFO Lights on: December 10, 2009, 07:58:32 am
Here's a video of my first project - a sequenced light controller for a UFO model kit, with a light activated trigger.



Been a fun learning experience and a nice return to a hobby I used to pursue 25 years ago!
69  Forum 2005-2010 (read only) / News / Re: How to pronounce "Arduino" ? on: November 26, 2010, 11:19:27 am
Ah yes. Well at least I'm not imagining it smiley

Now don't get me started on "innernet"  ;D
70  Forum 2005-2010 (read only) / News / Re: How to pronounce "Arduino" ? on: November 26, 2010, 03:54:28 am
On a related note, in quite a few of Arduino project-related video clips I've watched, people pronunce "solder" as "sodder"... never heard that before, maybe it's a US thing (I'm English)...

71  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Removing & replacing bootloader on: February 24, 2010, 09:48:08 am
Awesome - thanks Ken!
72  Forum 2005-2010 (read only) / Frequently-Asked Questions / Removing & replacing bootloader on: February 24, 2010, 08:03:20 am
I've just got my TinyISP programmer - before I potentially destroy my limited supply of 168s/328s I just wanted to doublecheck my understanding....

1) If I upload may application .hex file to the chip with the programmer via the ICSP connector & AvrDude, this will overwrite the bootloader.

2) I can re-upload the bootloader via the prgrammer using the Arduino sw "Burn Bootloader" option and everything will be back to square one - clean but bootloaded chip?

Is that correct?
Cheers

73  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Need Suggestion Common Parts for Arduino Projects on: January 13, 2011, 07:50:38 am
A bunch of different coloured LEDs

DIL sockets if you're not breadboarding...
74  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: DIY inkjet PCB's???? on: October 22, 2009, 07:12:01 am
I finally got to trying out my JetStar inkjet film this week, and was more than satisfied with the results:



I drew up the plans in ExpressBCB before realising that it has somewhat limited print options - i.e. you can't get to the printer properties dialog... but discovered this is easily circumvented by printing to the MS XPS device, and then printing the resultant file from IE - comes out at exact scale without any messing around.

Chosing "Inkjet transparency" paper and High quality photo printing on my Epson R300, the black was not as black as I'd hoped - still a bit translucent when holding it up to the light, but I did a test exposure from 1 to 10 minutes and experienced no bleed-through exposure what so ever. Everything from 2 mins on developed fine.

For the actual boards, I gave them 2min 30 sec, and the only issue I had through to the etched boards were where the photoresist coating was actually damaged in a small area of the larger one.

These are the first boards I've produced in probably 25+ years - it gave me a real nostalgia trip back to my teenage years! If only it were so easy to produce the artwork in those days!

75  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: DIY inkjet PCB's???? on: August 28, 2009, 06:39:18 am
elwing - yes this is definitely just for producing artwork for photo-sensitised board
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