<div dir="ltr"><div><div>Has anyone ever had any personal experience with the Xminilab series of small oscilloscopes?<br><br><a href="http://www.gabotronics.com/oscilloscopes/xminilab-portable-oscilloscope.htm">http://www.gabotronics.com/oscilloscopes/xminilab-portable-oscilloscope.htm</a><br><br></div>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<br><br></div>I have had one of those on my TOBUY list for a while...<br><div><div><div><br><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 18, 2015 at 11:54 AM, Chip McClelland <span dir="ltr"><<a href="mailto:chip@mcclellands.org" target="_blank">chip@mcclellands.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.<div><br></div><div>Thanks, </div><div>Chip <br><br>On Saturday, January 17, 2015, <<a href="mailto:triembed-request@triembed.org" target="_blank">triembed-request@triembed.org</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send TriEmbed mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: Logic analyzer recommendation (Jon Wolfe)<br>
2. Why Did This Stop Working? (Grawburg)<br>
3. Re: Why Did This Stop Working? (Shane Trent)<br>
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Message: 1<br>
Date: Sat, 17 Jan 2015 14:48:32 -0500<br>
From: Jon Wolfe <<a>jonjwolfe@anibit.com</a>><br>
To: Chip McClelland <<a>chip@mcclellands.org</a>>, "<a>triembed@triembed.org</a>"<br>
<<a>triembed@triembed.org</a>><br>
Subject: Re: [TriEmbed] Logic analyzer recommendation<br>
Message-ID: <<a>6d7mvm2pv0sfnbymgj40tcwp.1421524112170@email.android.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
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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.<br>
<br>
<div>-------- Original message --------</div><div>From: Chip McClelland <<a>chip@mcclellands.org</a>> </div><div>Date:01/17/2015 11:40 AM (GMT-05:00) </div><div>To: <a>triembed@triembed.org</a> </div><div>Subject: [TriEmbed] Logic analyzer recommendation </div><div><br>
</div>To all,<br>
<br>
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?<br>
<br>
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. ?<a href="https://www.adafruit.com/products/2312" target="_blank">https://www.adafruit.com/products/2312</a><br>
Thanks,<br>
<br>
Chip<br>
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<br>
--<br>
Sent from my iPhone - please excuse the typos<br>
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Message: 2<br>
Date: Sat, 17 Jan 2015 15:21:15 -0500<br>
From: Grawburg <<a>grawburg@myglnc.com</a>><br>
To: Triangle Embedded Devices <<a>TriEmbed@triembed.org</a>><br>
Subject: [TriEmbed] Why Did This Stop Working?<br>
Message-ID: <<a>8beae92832cea269a16b8bc3c1481ef2@myglnc.com</a>><br>
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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)<br>
<br>
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.<br>
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Thanks,<br>
Brian Grawburg<br>
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Message: 3<br>
Date: Sat, 17 Jan 2015 15:05:00 -0800 (PST)<br>
From: "Shane Trent" <<a>shanedtrent@gmail.com</a>><br>
To: "Grawburg" <<a>grawburg@myglnc.com</a>><br>
Cc: Triangle Embedded Devices <<a>triembed@triembed.org</a>><br>
Subject: Re: [TriEmbed] Why Did This Stop Working?<br>
Message-ID: <1421535900007.e33dcb59@Nodemailer><br>
Content-Type: text/plain; charset="utf-8"<br>
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Brian,<br>
<br>
<br>
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.?<br>
<br>
<br>
<br>
<br>
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.?<br>
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Shane<br>
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?<br>
Sent from Mailbox<br>
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