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1  Development / Other Hardware Development / Re: Nano V3 useless over wide temperature range on: March 17, 2014, 10:18:16 am
A crystal is a crystal, but one resonator is not the same as another - is your spec the one they are using? Probably not.
2  Development / Other Hardware Development / Re: Nano V3 useless over wide temperature range on: March 16, 2014, 11:28:04 pm
Within 1%over 90C range.
3  Development / Other Hardware Development / Re: Nano V3 useless over wide temperature range on: March 16, 2014, 09:44:58 pm
I need to keep a 1 khz square wave stable. Sure, I can add a thermostat but it's not cost efficient.
4  Development / Other Hardware Development / Nano V3 useless over wide temperature range on: March 16, 2014, 12:32:09 pm
I find it amazing that in order to save 2cents on a crystal they are still building the Nano V3
with a resonator. That makes it useless for accuracy over outside temperature ranges of from
-40C to +50C. Too bad, it's a good form factor for embedded systems, but even the Chinese
who copied it are doing the same thing.
5  Using Arduino / Installation & Troubleshooting / Re: Can't upload to Arduino Micro on: June 03, 2013, 05:54:37 pm
Excellent writeup and advice - does indeed solve the Micro upload problem!
6  Using Arduino / Installation & Troubleshooting / Re: Arduino Mirco Atmel 32U4 upload via Avrdude problem on: June 03, 2013, 04:33:46 pm
How do you get Arduino bootloader on COM19 - I just got the board, its serial monitor runs the word "TESTATA" forever, so it works.
I cannot upload the blink sketch - during upload the COM20 disappears, shows up under "other devices", then again under com ports,
then I get a load failure after a long time that says:
Binary sketch size: 4,830 bytes (of a 28,672 byte maximum)
Found programmer: Id = "Bsž"; type =
    Software Version =  Hardware Version =
avrdude: error: buffered memory access not supported. Maybe it isn't
a butterfly/AVR109 but a AVR910 device?
7  Using Arduino / Installation & Troubleshooting / Re: Micro ICSP header pins should be optional on: May 27, 2013, 12:44:27 pm
I can just see explaining myself - "gee, we need a girls with a desoldering gun in the
production line." Or assembling, debugging and testing a clone without knowing how
many units I'll need. I'm a fan of more simple options and fewer complicated standards.
8  Using Arduino / Installation & Troubleshooting / Micro ICSP header pins should be optional on: May 27, 2013, 11:47:36 am
The beauty of the Micro is obvious - small and compact.
Too bad it's marred by the ICSP headers - they should optional, same
as the connect headers. They just stick out too much, and many of
us don't need them. If you try to use the board as a component you
either have to roll your own, or squeeze hard, or snip headers. Ugh.
9  Using Arduino / Sensors / Re: Interrupt catching high transition at 2.5V, not 3 V on 328P on: May 14, 2012, 10:25:58 am
Thank you Mark - more or less what I figured, but you confirmed it. I will use them that way, only because I need a VERY fast way to detect a rapidly rising voltage (e.g. short-circuit detection.) Your confirmation will now guide my design.
10  Using Arduino / Sensors / Interrupt catching high transition at 2.5V, not 3 V on 328P on: May 13, 2012, 07:12:08 pm
I am monitoring a voltage on digital pin 2 for a value in excess of a preset limit.
I can set that limit, but it depends on what Arduino thinks is a HIGH. I thought
that was supposed to be 3V or is that not quite accurate.
11  Using Arduino / Sensors / Re: Split-phase current sensing - best practice? on: March 29, 2011, 06:35:43 pm
You cannot double-count current that way.
However, series-wiring the CT's may give incorrect values since currents are out of phase by 1800.
Presumably that would place CT voltage outputs out of phase and canceling.
The way I'd do that is to send each CT to a separate adc and then let Arduino add up the conversions.
12  Using Arduino / Sensors / Re: Anybody using Rogowski coils for current sensing? on: March 29, 2011, 06:15:27 pm
Rogowski's are used routinely by power co's - operating at 60Hz in North America.
I am trying to use one fed directly to the adc; the coil produces a derivative of the
current; for a sine wave that's a cosine wave. Looks the same, 900 out of phase.
Just having trouble getting the spec - it produces ".404 mV/A" which is a useless fact because
that can be peak volts, peak-to-peak or rms.
13  Using Arduino / Networking, Protocols, and Devices / Re: Uploading hex over tcpip in arduino network on: March 16, 2011, 03:16:33 pm
DCB: your code works! But it has to be used at 57600 baud on Arduino-0021 for Atmega328p. Don't know how to override the uploader's speed. It looks like that may be built-in via boards.txt at bootloader burn time. Or it's used in some arcane fashion by the avrdude.
Good job.
14  Using Arduino / Networking, Protocols, and Devices / Re: Uploading hex over tcpip in arduino network on: March 14, 2011, 12:07:58 pm
You have groundbreaking code - it's exactly what's needed to program-load a network of Arduino's, where each may have different code depending on what its function is, and where only some may have to be re-loaded. I already modified Andrew Rapp's famous Xbee libraries to remove RxTx and replace it with an encrypted socket handler. I'd like to do the same here.

When I try it against 3 different 328p's I do get timeouts or "invalid response" though. It would be nice if somebody could verify that.
I am looking at the bootloader source code to find out what's missing. There are control tables in there that are chip-specific, and
it's going to be a long haul. A few hints from the powers that manage that code would be nice...
15  Development / Other Software Development / Re: Program loader for networked machines on: March 13, 2011, 07:38:24 pm
Now that I have mind-melded with avrdude a bit more I might take this project in a slightly different direction; reinventing the wheel is not a good idea - I think all I need is a -P <tcpip port> option on avrdude.
Thanks for the parse pointer though - never know which way the chips will fall.
 
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