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1  Community / Products and Services / Re: The amazing renesas powered MCU board : GR-SAKURA-FULL on: October 29, 2012, 09:29:21 pm
I've been trying to play with one of the YRDKRX62N demo boards, i.e. a board with everything + the kitchen sink and a JTAG debugger, it's a complex chip to be sure... Having something like this distill it down to arduino-like APIs is nice.  Wish it was sold in the USA, couldn't find any hits when I googled searched.  I'd personally like to dive into the RX architecture more alongside learning ARM (TI Stellaris LaunchPad specifically...) cause I think RX is superior, at least on paper.
2  Using Arduino / Installation & Troubleshooting / Re: Leonardo SL6 serial port issues on: September 10, 2012, 12:06:07 pm
adding to this thread (I've been helping him get it running)-

The same Leonardo board works great on 2 MacBook Pro's so far, showing up as a /dev/tty.usbmodem411 type of device.  So it seems to be something Linux-related going wrong here.
3  Using Arduino / Microcontrollers / Re: SoftwareSerial with 1284P vs 644P on: August 06, 2012, 08:01:38 am
Are the boards' pinouts different?  i.e. the digital pin-to-MCU pin# association?
4  Using Arduino / Microcontrollers / Re: Building a dual MCU project with two ATmega328 chips on: August 01, 2012, 08:35:45 pm
Probably add -C ..\etc\avrdude.conf to the options list... that's what I have to do

FWIW, I have this jotted down in my text notesfile for the 1284P:

(Burning Bobuino fuses on MacOS X)
bin/avrdude -C etc/avrdude.conf -v -p m1284p -c stk500v2 -P /dev/tty.usbmodem411 -e -Ulock:w:0x0F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m
5  Using Arduino / Microcontrollers / Re: New board - '1284 Mini on: July 29, 2012, 06:51:35 am
Not entirely related but kinda, I built my first SMD 1284 project last night and I was impressed how easy it was to solder the Atmel TQFP-44 package; it has 0.65mm pitch pins so I was able to tack them one at a time, no need to "rake" the soldering iron across all the pins.  Had 2 solder bridges that came off easily with wire braid.
6  Using Arduino / Microcontrollers / Re: New board - '1284 Mini on: July 03, 2012, 07:40:41 am

 The board looks excellent! The boards look like they should be useful for lots of designs.

You have done so many boards that you need your own logo to go with your designs, I was thinking of a crossroads sign but, could not find one that fits.

Any suggestions for mating boards?

 If you are asking for boards that could go with this one, I think a regulator board would be nice. I would like a board that could be built as a 2 stage board so, that I could put 16volts to it or as little as 7. I imagine 2 regulators and a jumper to decide if I need both stages. A switching supply would be better but, I am guessing more complex. I would like to have enough current ability to run the 1284 to it's current limit plus a LCD screen like a 4*16 character.
Btw switching regulators don't have to be complex--these guys pulled off a nice product:

Same pinout as the LM7805, takes 7-36V input.  Using one right now in my wife's car (powering several gadgets with power+data sent over CAT5 cable), quiescent current of 5mA.
7  Development / Other Hardware Development / Re: Good PCB desgin software on: July 02, 2012, 12:34:11 pm
Couldn't get used to Eagle, using DipTrace nowadays and trying to get into KiCad (according to Laen from OSHPark--formerly called the DorkbotPDX PCB service--KiCad has overtaken Eagle in popularity with hobbyists submitting boards to his service)
8  Using Arduino / Microcontrollers / Re: New board - '1284 Mini on: June 28, 2012, 08:35:40 pm
I have a well stocked box of 0603 components... never bought 0805 caps, just some small-value resistors and LEDs.  Would 0805 pads fit an 0603 cap (e.g. for the 22pF xtal load caps?)
9  Using Arduino / Networking, Protocols, and Devices / Re: NRF24L01 transceiver and 315/433MHz RF links on: June 28, 2012, 08:24:26 am
Having toyed with the cheap PCB trace antenna version of the nRF24L01+ plenty, I doubt it'd pull off that range.  The RP-SMA jacked version (for a wifi antenna) should IMO especially with no obstacles in the way.  Maybe even with a jacked unit on the transmitter side and a PCB trace version on the other, xmit power set to max on both ends.

Keep in mind the PCB trace antenna version I have is even cheaper than the one you listed, it doesn't have any zig-zag in the trace just a "7" shaped trace.  The zig-zag trace might work better, I don't know.  SparkFun also sells one with a "chip antenna" (those things intrigue me, how well do they actually work?) which might be nice.  The RP-SMA jacked one uses more power due to an RF amplifier onboard between the nRF chip and the jack.
10  Using Arduino / General Electronics / Re: is there a 24 volt version of arduino ? on: June 27, 2012, 02:31:31 pm
No, not really.  The chip itself can only run at 5V (6V maximum).  However I did see an arduino variant that was hardened for 12V --

It's conceivable one could design an Arduino with all the various I/O ports gated in such a way that they interface with 24V, using level shifters or voltage dividers (e.g. for analog inputs) but I've not heard of one already designed for this purpose.
11  General Category / General Discussion / Re: xmega on: June 27, 2012, 08:51:52 am
Yeah the Xmega seems like a victim of.... something.  Probably its early-day supply problems combined with the presence of ARM for higher-end options (although Arduino-wise, it's not like the Due is out yet... but ARM seems like a more appropriate use of the arduino team's effort than Xmega)
12  Using Arduino / Networking, Protocols, and Devices / Re: How to get two Arduinos to access one I2C device? on: June 22, 2012, 08:18:22 pm
I2C *is* smart enough not to transmit if the bus is in use.  It's called bus arbitration and the losing master will kick back an error to the calling application.

Still a good idea to employ a negotiation system if you don't want to leave things to chance.
13  Using Arduino / Networking, Protocols, and Devices / Re: Learning SPI. on: June 22, 2012, 08:15:22 pm
Yep sounds right.  Microcontrollers with built-in SPI driver hardware employ a memory-addressable Shift Register where the I/O takes place, called "SPDR" in the AVR.

Writing to SPDR internally triggers activation of the SPI clock generator, which clocks out the bits in SPDR one at a time while shifting in the input bits from the MISO pin at the other end of the shift register, so that once the SPI clock has completed its 8 pulses the contents of SPDR are equal to the inputted byte from the slave.
There's usually a status register you can poll to check when the SPI clock is done.  Both the AVR and ARM examples show this.
14  Using Arduino / Microcontrollers / Re: make an arduino with MSP430 on: June 22, 2012, 08:02:07 pm
The TI LaunchPad is TI's "answer" to Arduino..... although hardware specs wise it's just not comparable, with the largest supported chip in the value line only having 16KB flash, but TI designed it to take "BoosterPaks" which are supposed to be like shields.

The main saving grace is the LaunchPad can be purchased for only $4.30.  On the software development side the IDEs provided are commercial crippleware except the open source "mspgcc" and "mspdebug" toolchain, and someone is working on an mspgcc-based port of the Arduino IDE called Energia.

Check out -- it's the main enthusiast site for the line.  A small but tight community IMO.

I personally plan to do some projects with it soon as it does have some nice features for power-miser-oriented designs.  I think of the MSP430G2xxx "value line" as a 16-bit analogue to the Atmel ATTiny series.
15  Using Arduino / General Electronics / Re: 5v fixed linear regulator off of 12v battery.... tons of wasted power on: June 22, 2012, 01:13:18 pm
Actually there's nothing about decoupling I can say that wouldn't be thoroughly covered by grumpy mike's page-
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