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76  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

77  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...
78  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!

79  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
80  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: DIY inkjet PCB's???? on: August 28, 2009, 05:11:04 am
I just got some of this stuff to try - I'll let you know how it goes

http://www.rapidonline.com/Tools-Fasteners-Production-Equipment/PCB-Equipment/Drafting-Aids/Jetstar-Standard-and-Jetstar-Premium-inkjet-artwork-films/66161

81  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Visual Studio 2008 GUI on: April 07, 2010, 12:20:13 pm
Hi Tim,
I'm definitely interested in trying this - as a VS user, the Arduino UI makes me want to poke pins in my eyes  ;D
82  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Sleep mode? on: March 30, 2010, 02:45:01 pm
Cheers for the clarifications!  smiley
83  Forum 2005-2010 (read only) / Frequently-Asked Questions / Sleep mode? on: March 30, 2010, 05:22:19 am
Was just thinking about about when the Arduino is in sleep mode - what happens to the output pins?

Do they remain in the state they were (possibly still sinking/sourcing current, or do they go into a tristate?

Cheers
84  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Flash vs EEPROM on: March 29, 2010, 03:06:48 am
Quote
Leaving interrupts disabled that long is very likely going to cause problems.

Yeah I suddenly realised that just after I posted!

I'm thinking of something on the lines of

setup
{
  read eeprom - if it's outside permitted range, default to 0
  copy value to ram
}

ISR
{
  update ram value
}

loop
{
  if ram & eeprom differ, write ram back to eeprom
  do stuff with ram value...
}

85  Forum 2005-2010 (read only) / Frequently-Asked Questions / Flash vs EEPROM on: March 29, 2010, 02:13:38 am
Hi

I need to store one byte of program-state data in non-volatile memory. Are there any pros/cons on using flash vs eeprom?

From a code POV it looks like the EE is most straightforward.

Any issues with writing either in an ISR?

Cheers
86  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: UK Users on: March 22, 2010, 04:22:33 am
Quick followup on this thread - I finally got my design finalised and sent off to Techbridge. They ended up taking a couple more days than the 11 WD promised, but the quality is top notch. I'd definitely use them again.

87  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: UK Users on: February 23, 2010, 08:26:59 am
jabber - did you use Eagle to design your boards for Techbridge? Did you run just the standard drc and was there anything else needing a tweak in the CAM job?


88  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: UK Users on: February 15, 2010, 03:27:41 pm
What does a typical board cost all in through batchpcb? I couldn't get any idea of actual price when I looked...
89  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: UK Users on: February 15, 2010, 03:24:55 pm
Jabber - that's good to know! Cheers.

Edit - was that going though the online quote thing, or did you negotiate something?
90  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: UK Users on: February 15, 2010, 10:31:46 am
defsdor - I'm in a similar position, but a little further on. I too used to photo etch PCs back in the 70's & early 80's - and because I still had the UV box up in the loft, I'm still using that method for my prototypes.

I bought an Arduino last year and did some experimentation to get to know the basics and then made my 1st standalone project (complete with a few basic noob errors like no decoupling  :-[) I used PCBExpress for the layout because it was easy to pick up, but the limitations soon became obvious (particularly as I needed a lot of rotated and precisely placed components).

Since then I have been redeveloping my original custom project (lighting rig for a model) into a simpler more generic device for commercial sale so I have invested the time getting to know Eagle and investigating fab houses.

I'm still hand etching single sided prototypes until I know the circuit is what I want, then I will be able to shrink it considerably onto a double sided board, but with a schematic & layout package like Eagle you are assured that any layout variations will still be functionally correct.

a couple of UK fabs I've looked at so far are
http://www.quick-teck.co.uk
http://www.tecbridgecircuits.co.uk

If anyone has any experience with either, I'd be interested to hear!
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