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16  Using Arduino / Networking, Protocols, and Devices / Re: pi vs. Arduino on: April 22, 2013, 10:53:04 am
Have you read the specifications? What don't you understand?
17  Using Arduino / General Electronics / Re: can someone reccomend me an entry lever scope please on: April 15, 2013, 03:09:14 pm
I use a Tek 2235 100 MHz dual-channel scope that I've had for years. The timebase switch is a bit intermittent (spares aren't available) but it works OK.
18  Topics / Product Design / Re: Itead, Members with Experience... on: April 05, 2013, 05:43:31 pm
I've been pricing my board with itead... 2x2.5"  My board isn't exactly 10cm x 10cm dimensions.

So I'd have to use ITead's Small Batch 10x10cm order option...
50pcs, Red, 1.6mm, Lead Free HASL, 100% etest = $155   = $3.10 per board
shipping? .... who knows... 3 weeks?

Using my other supplier, PCBCart... 2x2.5"
50pcs, Red, 1.6mm, Lead Free HASL, 100% etest = $130.47 = $1.63 per board  <---- and this already includes a $48.97 one-time tooling charge!
Turnaround time... 8 days.

If I re-order 50pcs of the same boards again, iTead will cost me another $155 again.
Reordering from PCBCart the same board, will cost $48.97


Boards don't have to be 10 cm x 10 cm! My recent order for 3" x 1.6" boards cost me $22 for 12 boards, plus $5.59 for postage.
19  Topics / Product Design / Re: Itead, Members with Experience... on: April 04, 2013, 01:22:50 pm
My recent order with ITead was delivered two days ago (April 2). They received the order on March 5, and posted the boards on March 14.
20  Topics / Product Design / Re: Itead, Members with Experience... on: March 24, 2013, 03:40:15 am
I've used GC-Prevue for years.

My latest boards from ITead arrived in the UK a couple of days ago, I should get them tomorrow.

Order was placed March 5th. I haven't ordered from them for some time, they used to take two weeks or less.
21  Products / Arduino Due / Re: Is their a way in the data sheet or some way to add more program memory to due. on: March 22, 2013, 08:49:42 am
I could be wrong, I just found this in an ARM doc. on the Cortex-M3:

"The Cortex-M3 design has an internal bus infrastructure optimized for this memory usage. In addition, the design allows these regions to be used differently. For example, data memory can still be put into the CODE region, and program code can be executed from an external Random Access Memory (RAM) region."
22  Products / Arduino Due / Re: Is their a way in the data sheet or some way to add more program memory to due. on: March 22, 2013, 04:23:01 am
That isn't program memory, though.
23  Products / Arduino Due / Re: Reset the Arduino Due board using the watchdog on: March 09, 2013, 02:59:03 am
A software reset on the ARM7 chips, such as the LPC2148, was performed by setting the WDT to a very short period and enabling it:

Code:
  WDTC = 0x00000FFF;  // very short timeout
  WDMOD = 0x03;       // watchdog resets CPU
  WDFEED = 0xAA;      // start watchdog
  WDFEED = 0x55;

Something similar might be possible on the Cortex-M3.
24  Products / Arduino Due / Re: Cortex-M Debug Connector on: March 08, 2013, 10:28:11 pm
All the boards I have use the standard 10 pin connector, as does the CrossConnect JTAG unit that I use.
25  Products / Arduino Due / Re: Cortex-M Debug Connector on: March 08, 2013, 03:27:48 pm
It is designed for the ARM Cortex 10-pin SWD connector, as are most Cortex boards:

http://www.arm.com/products/system-ip/debug-trace/coresight-soc-components/serial-wire-debug.php
26  Products / Arduino Due / Re: DUE JTAG connector size on: March 04, 2013, 06:29:46 am
They are made by Samtec. Here is an adapter:

http://www.embeddedartists.com/products/acc/acc_jtag_adapter_kit.php
27  Using Arduino / General Electronics / Re: did my arduino get damaged on: March 03, 2013, 03:00:08 pm
Why don't you see if it is still working?
28  Using Arduino / General Electronics / Re: Looking for better soldering iron on: March 03, 2013, 03:32:17 am
Metcal makes systems that will do both types of soldering. The current MX-5000 units are expensive, but I use an older second-hand STSS power unit with the later MX-500 handpiece and cartridges that cost me about £125. They often become available on Ebay, I bought a spare STSS unit for £75.
29  Products / Arduino Due / Re: High frequency measurement using Arduino Due on: February 28, 2013, 05:50:23 pm
Measure the time between two pulses. You can then calculate the frequency.
30  Products / Arduino Due / Re: High frequency measurement using Arduino Due on: February 28, 2013, 04:17:35 pm
How are you processing the input signal? You need to convert it to a square wave so that you can use a timer to measure to measure the frequency.
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