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16  Development / Other Hardware Development / Re: Eagle - board holes in library parts? on: September 10, 2013, 04:42:59 am
Just to clarify - this is not about making an irregular shaped board overall, it's about including slot / milling info in a specific component in the library, so every time you place the component you get the extra milling.

It 'seems' to work if you just draw wires on layer 20 in the package design (from looking at the Gerbers), I just wasn't sure if this was a 'legal' thing to do...
17  Development / Other Hardware Development / Eagle - board holes in library parts? on: September 09, 2013, 07:13:17 am
Is it possible to define a board cutout in a library part that is not just a round drill hole? More specifically a square hole or slot?

Would just drawing a shape on the Dimension layer be sufficient, or is this going to be down to the fab house in the end?
18  Using Arduino / Project Guidance / Re: Atmega328 EMF Detector on: September 03, 2013, 06:45:25 am
Is there any reason the LEDs on pins 15-17 have 4.7k resistors? This will only give you about half a mA through each, they will be very dim when on.

Also I'm not sure if the circuit was just drawn freehand or with a design package like Eagle, but you appear to have signal lines going through the 2 crystal caps (aside from issue already noted) - may be cosmetic, or may be a bad connection...
19  Using Arduino / Microcontrollers / Re: PCBs for Arduino project? on: July 29, 2013, 10:40:57 am
A few options here

20  Using Arduino / Project Guidance / Re: Advice needed for (very basic) PCB design on: July 29, 2013, 06:55:42 am
Traces look a bit fine to me - may be within the minimum, but I always err on 'comfortable' if you really don't need minium. Also some sparation distances are smaller than they need to be  - you've got traces coming off the pinheaders at cangles that take them close to other header pins when they don't need to pass that close...
21  Using Arduino / General Electronics / Re: Easiest configuration to power 200 LEDs on: July 05, 2013, 06:51:22 am
Is the idea really to have the LEDs on the RIM of the wheel ( NOT down the spokes)? To gain the illusion of a ring of light around the rim as the wheel is going round? In which case a) you don't need any micro control and b) you probably don't need anything like 50 per rim to get a nice ring illusion at any half decent speed - probably 6 would work great and save you a ton of power....
22  Using Arduino / LEDs and Multiplexing / Re: Larson Scanner, Anyone? on: June 13, 2013, 07:09:52 am
Check out the SoftPWM library - not only will it allow you to PWM all the pins, but has built in support for fade up and fade down of values over time, which is exactly what you need for such an application
23  Using Arduino / Programming Questions / Re: modifying SoftPWM for attiny on: June 10, 2013, 06:56:05 am
Sorry for not getting back -  I need to pick this all up again soon as I'm now trying to modify it for the Tiny85.

Glad you got it working but keep an eye out if you are trying to control a lot of outputs as the 2313 runs out of RAM before you run out of pins!
24  Development / Other Hardware Development / Re: Doubling up ICSP pins - recommendations? on: March 21, 2013, 04:17:02 pm
Just what I was looking for! Thanks!
25  Development / Other Hardware Development / Re: Doubling up ICSP pins - recommendations? on: March 21, 2013, 06:59:36 am
Sorry - USBTinyISP...
26  Development / Other Hardware Development / Re: Doubling up ICSP pins - recommendations? on: March 21, 2013, 02:55:27 am
TinyISP at the moment...
27  Development / Other Hardware Development / Re: Doubling up ICSP pins - recommendations? on: March 20, 2013, 08:16:16 am
I probably wasn't clear enough in my goals - a typical programmed scenario would be each of the 5 I/Os on the '85 would be outputs connected to LEDs (with approprate resistor), however I assumed when the device is being programmed, having the LED still connected to the same pins as being used for the ISCP would cause problems, especially if the programmer could not provide the current to drive the LED too.

What I wasn't sure of was if all the '85 outputs were connected to transistors to switch the LED current, whether that would still be consided 'risky' for the programmer?

In the name of experimentation I tried it out - with LEDs direct, definite fail with programmer failing to detect the device. But with 85 driving LEDs trough uln2803 gates, I was able to program successfully.

I fully appreciate just because it appears to work doesn't mean it's not actually doing untold or undetected damage, which is what prompted the question in the first place.

But as I understand it with the 2803, I'm only ever connecting outputs to inputs (run time) and outputs & inputs to inputs (program time) but never outputs to outputs so it should be safe.

28  Development / Other Hardware Development / Re: Doubling up ICSP pins - recommendations? on: March 18, 2013, 10:02:17 am
Ideally I was going for the very minimum component count due to size limitations (I'm already using an SMD package which would make programming outside of the board impossible once assembled). I did wonder if driving the LED through a transistor rather than direct would prevent the programmer being affected though...
29  Development / Other Hardware Development / Doubling up ICSP pins - recommendations? on: March 18, 2013, 07:53:43 am
Are there any recommendations or guidelines as to what you can attach to the pins shared with the ICSP interface - I'm currently working on a Tiny85 project that I would like to leave ICSP access to, but this obviously ties up most of the I/Os - I'm looking at using LEDs on most but may have a jumpered input on one pin.

30  Using Arduino / Microcontrollers / Re: Avrdude Verifcation failure when using -q switch on: March 14, 2013, 03:20:13 am
I don't think it's the programmer as it worked fine with avrdude 5.10 and has been working for a couple of years. Don't have another '85 but I do have a '2313 so I'll try that as soon as I get a chance again
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