[TriEmbed] Logic Analyzer Recommendatio

Sun Jan 18 11:05:41 CST 2015

Has anyone ever had any personal experience with the Xminilab series of
small oscilloscopes?

http://www.gabotronics.com/oscilloscopes/xminilab-portable-oscilloscope.htm

You can buy them just as a DIP package you can put in your circuit while
building it, or minimalistic case, or a full case, and all at a very good
price.  They do analog and digital, as well as digital decoding of SPI,
I2C, etc

I have had one of those on my TOBUY list for a while...

On Sun, Jan 18, 2015 at 11:54 AM, Chip McClelland <chip at mcclellands.org>
wrote:

> To all,  thanks for the responses thus far. I have one other question
> before I pull the trigger on this.  Does the Saleae doe enough extra to
> justify the extra price over the Bus Pirate?   My main focus today is
> listening to the I2C bus but am open to getting a more capable tool if it
> may be helpful in the future.
>
> Thanks,
> Chip
>
> On Saturday, January 17, 2015, <triembed-request at triembed.org> wrote:
>
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>> Today's Topics:
>>
>>    1. Re: Logic analyzer recommendation (Jon Wolfe)
>>    2. Why Did This Stop Working? (Grawburg)
>>    3. Re: Why Did This Stop Working? (Shane Trent)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 17 Jan 2015 14:48:32 -0500
>> From: Jon Wolfe <jonjwolfe at anibit.com>
>> To: Chip McClelland <chip at mcclellands.org>, "triembed at triembed.org"
>>         <triembed at triembed.org>
>> Subject: Re: [TriEmbed] Logic analyzer recommendation
>> Message-ID: <6d7mvm2pv0sfnbymgj40tcwp.1421524112170 at email.android.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> I highly recommend the Sallae. I have a clone, ?that I actually received
>> by accident, sort of. It has saved me many times. I will purchase an
>> original one when I can afford it.
>>
>> <div>-------- Original message --------</div><div>From: Chip McClelland <
>> chip at mcclellands.org> </div><div>Date:01/17/2015  11:40 AM  (GMT-05:00)
>> </div><div>To: triembed at triembed.org </div><div>Subject: [TriEmbed]
>> Logic analyzer recommendation </div><div>
>> </div>To all,
>>
>> I am trying to troubleshoot an issue with multiple devices on an i2c bus.
>> Do any of you have a recommendation for an inexpensive logic analyzer that
>> I could use to troubleshoot?? Ideally it would be able to look at SPI and
>> simple digital and analog lines. Mac compatibility is a must. Any
>> recommendations?
>>
>> Adafruit has a Sallae 4-channel analyzer that is my current front runner
>> but don't want to spend $100 and find out it is not the best choice. ?
>> https://www.adafruit.com/products/2312
>> Thanks,
>>
>> Chip
>>
>>
>>
>> --
>> Sent from my iPhone - please excuse the typos
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>> ------------------------------
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>> Message: 2
>> Date: Sat, 17 Jan 2015 15:21:15 -0500
>> From: Grawburg <grawburg at myglnc.com>
>> To: Triangle Embedded Devices <TriEmbed at triembed.org>
>> Subject: [TriEmbed] Why Did This Stop Working?
>> Message-ID: <8beae92832cea269a16b8bc3c1481ef2 at myglnc.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> My train/conveyor project developed a glitch when I redid the protoboard
>> I was using.? The key to the project was an pair of IR LED
>> emitter/detectors (Sparkfun SEN-00241) that until the rework operated just
>> fine when 4.5 inches apart. Both units were inside of 1/2" tubes so that
>> room lighting did not affect them. ? Circuit is attached. (I'm using 3.3
>> VDC)
>>
>> Now, here's the one change -- and it's actually due to an original
>> mistake.? The schematic shows a 10k resistor going to the collector of the
>> detector. That's what I thought I had used on the original board (the one
>> that worked) but discovered I actually had a 100k. My new board does have
>> the 10k and what is happening is that instead being able to have the
>> emitter/detector work at 4.5" they only work at about 2". Meaning that
>> voltage goes to Vout which is a pin on my MCP23008 port expander when the
>> devices are much beyond 2 inches apart.
>>
>>
>> Thanks,
>> Brian Grawburg
>>
>>
>>
>>
>>
>>
>>
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>> ------------------------------
>>
>> Message: 3
>> Date: Sat, 17 Jan 2015 15:05:00 -0800 (PST)
>> From: "Shane Trent" <shanedtrent at gmail.com>
>> To: "Grawburg" <grawburg at myglnc.com>
>> Cc: Triangle Embedded Devices <triembed at triembed.org>
>> Subject: Re: [TriEmbed] Why Did This Stop Working?
>> Message-ID: <1421535900007.e33dcb59 at Nodemailer>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Brian,
>>
>>
>> Just change back to the 100k. The larger resistor provides a weaker
>> pull-up and makes it easier for your IR signal to turn on the
>> photo-transistor and pull down the output signal. The higher value of the
>> 100k will make your sensor more sensitive to external light sources. But it
>> sounds like your light shield on the ?detector is keeping out any extra
>> light. Just be careful in the future if you start getting false triggers
>> due to new light sources or moving the track to a new location.?
>>
>>
>>
>>
>> Another option would be using a smaller value resistor on your LED but
>> you must stay under the LED current limit. I recommend the 100k pull- up
>> since you already know it works.?
>>
>>
>>
>>
>> Shane
>>
>>
>>
>>
>>
>>
>>
>>
>> ?
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>
>
> --
> Sent from my iPhone - please excuse the typos
>
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