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Re: is JTAG needed for SAM7 processors

 by mac ¦  Thu Jun 16, 2011 5:07 am ¦  Forum: Everything ARM and LPC ¦  Topic: is JTAG needed for SAM7 processors ¦  Replies: 9 ¦  Views: 1927

JTAG is the way to go: debug/flash across different vendors without an itch. Other proprietary debug interface can be more efficient and requires less resources, but they all end up being expensive and lock you to a vendor. For price, you can DIY a wiggler-like parallel interface (if your PC have on...

Re: Xprotolab - Miniature Oscilloscope and Waveform Generator

 by mac ¦  Thu Feb 17, 2011 1:31 am ¦  Forum: SparkFun Product Questions ¦  Topic: Xprotolab - Miniature Oscilloscope and Waveform Generator ¦  Replies: 5 ¦  Views: 1464

Hi, I just received my Xprotolab. I am really impressed by the product. It's not fair to compare to a full scope or logic analyzer (it's really tiny), but it's really impressive to pack so much functionalities on a corner of a breakboard. Considering the price, it's really a "nice to have" for the b...

Magnetic encoder breakout

 by mac ¦  Tue Feb 15, 2011 1:37 am ¦  Forum: New Product Ideas ¦  Topic: Magnetic encoder breakout ¦  Replies: 0 ¦  Views: 920


AustriaMicrosystems has a good range of magnetic encoder (AS5055 12 bits absolute for example). These seems really neat but are difficult to find in low quantities (with the required magnet) and use QFN/TSSOP packages.
It can be a nice breakout board to add to SF sensor line.

Re: LSM303 Breakout Board Not Responding

 by mac ¦  Tue Feb 15, 2011 1:23 am ¦  Forum: SparkFun Product Questions ¦  Topic: LSM303 Breakout Board Not Responding ¦  Replies: 14 ¦  Views: 2705

Yes the polulu board is the way to go for 3.3/5v operation.

Sparfun board is only usefull for 1.8v I2C (and still need 5v power). It requires another 1.8v reg and two fet or I2C level converter for 3.3/5v operation.

Re: Oscilloscope Question

 by mac ¦  Mon Jan 31, 2011 1:43 am ¦  Forum: SparkFun Product Questions ¦  Topic: Oscilloscope Question ¦  Replies: 21 ¦  Views: 2586

All scope I used had ground to earth (at least when AC mains operated).
But on most scope you can add a differential input probe, which are input to a differential amplifier.
In all case inputs are not isolated from ground/earth and have limitation in maximum voltage.

Re: Finding a low cost oscilloscope

 by mac ¦  Tue Jan 18, 2011 2:04 am ¦  Forum: PCB Design Questions ¦  Topic: Finding a low cost oscilloscope ¦  Replies: 23 ¦  Views: 12956

Well you get what you paid for :roll: I do not expect DSO in the 500/1000$ range to perform like the Agilent MSO6054 I have on my work desk. It appears there is a new interesting DSO, the Hantek/Tekway DST1102B, quite similar to Rigol but with better display (who can make a worse display anyway?). I...

Re: Xprotolab - Miniature Oscilloscope and Waveform Generator

 by mac ¦  Wed Jan 12, 2011 6:27 am ¦  Forum: SparkFun Product Questions ¦  Topic: Xprotolab - Miniature Oscilloscope and Waveform Generator ¦  Replies: 5 ¦  Views: 1464

Cute all-in-one scope. Quite limited but the small form factor and breadboard compatible footprint is nice. Is the logic analyser software implemented yet? I would have ordered one if usps express mail wasn't so expensive (the price of the board itself). Have you considered other usps shipping optio...

Re: Digital temperature sensor suggestions

 by mac ¦  Mon Jan 10, 2011 1:30 am ¦  Forum: SparkFun Product Questions ¦  Topic: Digital temperature sensor suggestions ¦  Replies: 7 ¦  Views: 779

Cheap and easy to use sensor with arduino: dallas DS1820 Need some special interface and software, but you can find ready-to-use example code for Atmel (ie arduino). Do not put the sensor directly in the bath. Put it into a casing, either plastic or glass, which is completely sealed. A cheap way is ...

Re: The search for the perfect ARM compiler/IDE

 by mac ¦  Fri Nov 19, 2010 3:15 am ¦  Forum: Everything ARM and LPC ¦  Topic: The search for the perfect ARM compiler/IDE ¦  Replies: 38 ¦  Views: 12985

Using a codesourcery toolchain is as simple as a tar command (on linux). Building a gcc toolchain is something a little more tricky. Having it build is only a small part from it, having good binutil/gcc/lib versions is the real part. I agree that most people never need to do this, except student bec...

Re: Programming Olimex SAM9-L9260

 by mac ¦  Thu Nov 18, 2010 6:18 am ¦  Forum: Everything ARM and LPC ¦  Topic: Programming Olimex SAM9-L9260 ¦  Replies: 6 ¦  Views: 2139

The main AT91 functionalities i need to deal with are: GPIO managing: i need to set and read the state of several I/O pins, and in particular i need to send a clock signal to 8 pins almost simultaneously (roughly speaking, i have to manipulate system oscillator to generate a 20 KHz pulsed signal an...

Re: The search for the perfect ARM compiler/IDE

 by mac ¦  Thu Nov 18, 2010 5:51 am ¦  Forum: Everything ARM and LPC ¦  Topic: The search for the perfect ARM compiler/IDE ¦  Replies: 38 ¦  Views: 12985

Yes codesourcery is the premium source for prebuild toolchains. Even if you are builing the chain on your own, it's often wise to look at version number they package (to avoid release with bugs or not well tested). You can also use eclipse with CDT as an IDE. Not my prefered choice, but it's here an...

Re: 70W Analog Solder Station Question

 by mac ¦  Mon Sep 13, 2010 1:29 am ¦  Forum: SparkFun Product Questions ¦  Topic: 70W Analog Solder Station Question ¦  Replies: 6 ¦  Views: 672

This station is great for hobbyist use, plenty of power, good tips, rather good regulation. Some minor drawback: - Holder is crap, it doesn't hold well the iron, or the tip touch the holder body. - No automatic temperature reducing in idle. For extended tip usage: use correct temperature for your so...

Re: using ARM-JTAG on laptop

 by mac ¦  Wed Sep 08, 2010 12:23 am ¦  Forum: Everything ARM and LPC ¦  Topic: using ARM-JTAG on laptop ¦  Replies: 9 ¦  Views: 1659

USB jtag, I use this one: with great success.

Re: MAX1555 replacement?

 by mac ¦  Wed Sep 01, 2010 4:59 am ¦  Forum: SparkFun Product Questions ¦  Topic: MAX1555 replacement? ¦  Replies: 8 ¦  Views: 1122

You have the MAX1811 which is a "big" max1555. 500mA, but switchable to 100mA

Re: Bring PCBs/components on an airplane?

 by mac ¦  Fri Jun 18, 2010 2:05 am ¦  Forum: SparkFun Product Questions ¦  Topic: Bring PCBs/components on an airplane? ¦  Replies: 11 ¦  Views: 4757

Never had any problem carrying laptop + dev boards + various debuggers or device + handfull of cables in hand luggages. Various country except US.
At most, they ask what it is only. And I mainly flight from one of the most pain in the a** security airport in France (and no, it's not Paris).