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9691  Topics / Product Design / Re: IC Fabrication Company... on: July 14, 2013, 09:01:23 pm
Quote
There are places in the U.S. that can make PCBs for much less than that.
I've not been able to find one. In most cases, there is a setup charge that makes small lots uneconomical.
Places I have tried were not able to accomodate combining small boards into a panel for unique users.
I suppose if you wanted to take on that task, as dorkbot/patchpcb has done, and with a US manufacturer, you might make a go of it.
9692  Using Arduino / General Electronics / Re: Myth Busters 3 – Myth: “You must have a gate resistor” on: July 14, 2013, 08:46:02 pm
Someone mentioned 8V and 130C.
I'm pretty sure 8V will blow the chip. I know from experience that 12V kills it immediately.
If you want to run at 130C, I suggest you try an automotive part and cross your fingers as you pass the Absolute Maximum:
0 - 16 MHz @ 4.5 - 5.5V (Automotive Temp. Range: -40°C to +125°C)
http://www.atmel.com/Images/doc7810.pdf
9693  Using Arduino / LEDs and Multiplexing / Re: Choosing Duty Cycle For LED Matrix on: July 13, 2013, 11:45:49 pm
Still plugging away?
9694  Using Arduino / Interfacing w/ Software on the Computer / Re: ports rx and tx like digital outputs on: July 13, 2013, 11:44:16 pm
D0, D1
9695  Using Arduino / Project Guidance / Re: Serial filtering program issues - running out of memory. on: July 13, 2013, 11:40:24 pm
'1284P, 16K SRAM.
Need more than that? Add external.
www.ruggedcircuits.com
9696  Products / Arduino GSM Shield / Re: Can't locate TX and RX on my GSM board on: July 13, 2013, 08:06:03 pm
I'd go with D0 and D1.
9697  Topics / Robotics / Re: BBC Turtle Clone? on: July 13, 2013, 07:58:35 pm
How will you mount the pen dead center and have room to move it up & down if the control  boards are there?
Maybe mount the control boards vertically instead of laying flat on the chassis?
9698  Topics / Robotics / Re: BBC Turtle Clone? on: July 13, 2013, 07:37:47 pm
Your call.
How expandable are they if you decide to make something more out of it?
9699  Using Arduino / General Electronics / Re: Compatibility between UNO and IC on: July 13, 2013, 07:34:22 pm
Running the 0-5V PWM thru a lowpass filter will create a smoothing effect that will appear as a lower voltage.
9700  Using Arduino / Motors, Mechanics, and Power / Re: How to connect more that 16 servo motors in arduino mega 2560? on: July 13, 2013, 07:32:54 pm
That's why I was asking about jitter as they powered up earlier.
I think try with one two both ways with representative components and see how it works.
9701  Using Arduino / Project Guidance / Re: FTDI Board Bad? on: July 13, 2013, 01:21:26 pm
I don't know if the PL2303 chips have a DTR pin on them, never looked them up, that's why I suggested them for non-DTR use.
9702  Using Arduino / Motors, Mechanics, and Power / Re: How to connect more that 16 servo motors in arduino mega 2560? on: July 13, 2013, 01:08:41 pm
I would think that approach would require 48 sets of fairly hefty current switching transistors, MOSFETs, whatever, depending on the servo needed.
Vs 1 really hefty switch and a simple set of logic level demux chips.
Either way could be made to work.
9703  Using Arduino / LEDs and Multiplexing / Re: Array of LEDs does not turn off on: July 12, 2013, 11:34:45 pm
Serial.print will slow things down some, you can remove it after confirm the levels are as expected.
9704  Using Arduino / Project Guidance / Re: DVM ideas on: July 12, 2013, 07:07:08 pm
analogRead returns an int.
100 x 25 = 2500, still an int.
use the modulo command to split the number up into its digits
9705  Using Arduino / General Electronics / Re: Software serial to externally powered device - no good? on: July 12, 2013, 05:24:23 pm
There you go.
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