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76  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

77  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
78  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Sleep mode? on: March 30, 2010, 02:45:01 pm
Cheers for the clarifications!  smiley
79  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
80  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...
}

81  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
82  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.

83  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?


84  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...
85  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?
86  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!
87  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: SMD Silkscreens on: February 25, 2010, 01:01:23 pm
Quote
I'm at work behind a difficult web filter, so I can't see the image you posted.
Ha - yeah I know all about that  smiley-sad

Thanks for the tip - I am using Eagle - I just tried the SparkFun cam file which did not produce the extra bits on the silk - so a bit of further poking revealed these were in the bDocu layer.. There was something else on the bottom silk I missed - some polarity indicators that I added to bDocu myself, which is why it was turned on.

I've moved them up to bPlace and all is well. Lesson learned - thanks for the help!

(Incidentally, the sparkfun cam doesn't seem to use the bCream layer at all..)
88  Forum 2005-2010 (read only) / Frequently-Asked Questions / SMD Silkscreens on: February 25, 2010, 12:14:47 pm
Not an Arduino question per se...

I'm just about to send off my first design for PCB fab - but checking over the Gerbers I noticed something odd..

I've got some 1206-package SMD caps and solder-jumpers on the bottom side of the board - they are the only things in the bottom silkscreen layer, but it would appear that the silkscreen ink would actually interfere with the solderability since it directly covers the unmasked parts of the pads.

Here's a simple example



For the caps there'll be a chunk of ink directly under the ends of the cap-chip - this may not be such a problem since the solder will connect the end faces to the pad above/below the ink, but for the case of teh jumper, the semicircles of ink will ack as solder mask exactly where you don't want it.

Surely that's not correct?

Any thoughts?
89  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Peer review on: February 19, 2010, 07:02:34 am
No - there is a solder-jumpable pad on the bottom side of the pcb under each resistor....
90  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Peer review on: February 18, 2010, 02:20:22 pm
Cheers Mike - appreciate your time!
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