Limpkin's blog - Tag - avr - Comments<div>An electronics geek blog, dedicated to sharing and open source. Check out my stores: <a href="https://lectronz.com/stores/stephanelec" hreflang="en" title="Lectronz store">EU</a> / <a href="https://www.tindie.com/stores/stephanelec" hreflang="en" title="tindie store">EU & US</a>.</div>2024-03-29T00:41:47+00:00Mathieuurn:md5:51de6a3d917257edeff5a252fe925b02DotclearMy new business card - limpkinurn:md5:92235628dc8d5fc46ca0aff93695ffa42017-02-20T12:15:48+01:002017-02-20T12:15:58+01:00limpkin<p>@<a href="http://www.limpkin.fr/index.php?post/2012/09/15/My-new-business-card#c95062" rel="ugc nofollow">Erik</a> : I'm affraid I'm not!</p>My new business card - Erikurn:md5:f403f1172e82adf8c5586b6cd598a89e2017-02-10T15:45:07+01:002017-02-10T15:45:07+01:00Erik<p>Are you making anymore of these cards?</p>The Engine Control Unit monitor project - limpkinurn:md5:539d2cc97b2e4c9f8289300ad2885ef72016-05-12T21:09:29+02:002016-05-12T20:10:30+02:00limpkin<p>@<a href="http://www.limpkin.fr/index.php?post/2011/01/11/The-Engine-Control-Unit-monitor-project#c14162" rel="ugc nofollow">Gaspar</a> : I've actually stopped working on it... but if the hardware is roughly the same it should work as is :)</p>The Engine Control Unit monitor project - Gasparurn:md5:87a2f576c3a999ce1ba15252d83a22bc2016-05-07T18:55:29+02:002016-05-07T17:55:29+02:00Gaspar<p>Hi.</p>
<p>I was looking for something like this and found your website.</p>
<p>I'm preparing a car (My car), with another engine but using the same wires inside.</p>
<p>But I wanted something like your project, to apply on it, since ECU is very limited to give values without a PC nearby.</p>
<p>I will put new sensors, different from the ones used by ECU and wanted something to make the reading and to show in LCD like yours.</p>
<p>Do you still work on this?</p>
<p>Thanks.</p>An Open CVMeter - limpkinurn:md5:8ae5b4bd0c09a7dc95df66b261e397cb2015-12-17T19:22:12+01:002015-12-17T19:22:12+01:00limpkin<p>It's a slave connector indeed. The device is detected as HID.</p>An Open CVMeter - Meurn:md5:9cfb307f4724c42ba304b651e651b6702015-12-17T16:22:31+01:002015-12-17T16:22:31+01:00Me<p>Do you need a fancy Rigol scope to use this? Is that a USB host or slave connector? I would assume that this device is a slave but from the picture it looks like a host connector.</p>
<p>You don't really talk about the software side of it. My assumption when reading that you needed USB because you weren't putting a display on it was that the USB would be to connect it to a computer to act as the display.</p>
<p>Maybe you are connecting a USB storage device? Then plugging that into the scope to plot the data on it? Do those scopes do that? If so then I suppose it shouldn't be too hard to plug the stick into a computer for plotting if you don't have the scope.</p>
<p>I ask because I might be interested in the kickstarter but not if it requires an expensive scope that is outside my budget to use it.</p>An Open CVMeter - limpkinurn:md5:d76a96c674d692602b39a0ece3def5bc2015-12-15T07:46:21+01:002015-12-15T07:46:21+01:00limpkin<p>@<a href="http://www.limpkin.fr/index.php?post/2015/11/24/An-Open-CVMeter#c9385" rel="ugc nofollow">Kris</a> : I just pushed it to the repository.</p>An Open CVMeter - Krisurn:md5:e711e2a20a00b43ff0aa00601a7e62772015-12-15T02:47:37+01:002015-12-15T02:47:37+01:00Kris<p>Is the BOM published anywhere? I didn't see it in the github project.</p>An Open CVMeter - John Blutarskiurn:md5:b0a86d762400b400cadcc8f4268f93802015-11-24T17:20:39+01:002015-11-24T17:20:39+01:00John Blutarski<p>Thru-hole ceramic capacitors do not exhibit much dC/dV at all -- this effect is only prominent in small surface mount capacitors that are forced to employ goofy dielectrics with very high epsilon. So I don't agree that "most ceramic capacitors lose up to 80% of their capacitance". Only low voltage, high value (>1000pF), surface mount caps using screwball dielectric materials.</p>A Timeless Fountain - limpkinurn:md5:0043c842238d2094c326b408e12e886c2015-06-26T21:34:18+02:002015-06-26T20:37:09+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2015/06/30/A-Timeless-Fountain#c2989" rel="ugc nofollow">FountainFan</a> :Thanks for your kind words! The firmware is an absolute mess as it is a non commented version of <a href="https://github.com/limpkin/capmeter" hreflang="en" rel="ugc nofollow">this</a>. Send me an email and I'll send you the sources :). Please also let me know how your experiments go!</p>A Timeless Fountain - FountainFanurn:md5:690934ae7baf132aa893d932f3e14b632015-06-26T10:55:29+02:002015-06-26T20:37:10+02:00FountainFan<p>Hi,</p>
<p>I have been attempting a very similar project, but from a slightly different angle. I tried using a solenoid pump to assure a regular drop rate but the variance of drop shape has been annoying me. I shall be trying your nozzle design next. Thanks for sharing ! Can I also ask if you have any intention of sharing the source code for this project ?</p>
<p>Regards.<br />
FF.</p>A Personal Perspective on Managing an Open HW Project - Part 2 - limpkinurn:md5:d9939b94cd43797c7a9394a634e39ffb2015-06-10T23:39:31+02:002015-06-10T22:40:53+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2015/03/04/A-Personal-Perspective-on-Managing-an-Open-Hardware-Project-Part-2#c2967" rel="ugc nofollow">D-Three</a> : Hello there! The mechanical design was actually made by a previous colleague of mine.</p>A Personal Perspective on Managing an Open HW Project - Part 2 - D-Threeurn:md5:4a7363727fc96d981184799a0d89eb492015-06-04T09:39:55+02:002015-06-10T22:40:53+02:00D-Three<p>Nice project! Haven't read much about it to be honest but it indeed has much potential. By the way, did you design the housing yourself?</p>RGB led matrices with animated gifs - barretturn:md5:d6426f95b35bbe958a0916b281909ddb2015-01-10T16:06:07+01:002015-01-11T12:29:14+01:00barrett<p>hahaha..I have a lot of 4mm pitch RGB 16×16 matrix ,But I live in Shenzhen, China</p>The Engine Control Unit monitor project - limpkinurn:md5:1e4a01f07ad85fd0a293855209f06b162015-01-05T00:22:38+01:002015-01-05T00:23:04+01:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2011/01/11/The-Engine-Control-Unit-monitor-project#c2844" rel="ugc nofollow">Denis Köllner</a> : Sorry, I'm not planning to release it!</p>The Engine Control Unit monitor project - Denis Köllnerurn:md5:4cfc7768949add8bda91c73476d5ef012015-01-01T13:24:33+01:002015-01-05T00:21:31+01:00Denis Köllner<p>Hi,</p>
<p>that is a very nice Project. I'm searching a long time for such an Displayunit. But I want to use three MAX31855 for the ExhaustGasTemperature sensoring (pre Turbo 1,2 and one for the Catalytic). Further to oil temperature, pressure and MAP should be measured.<br />
All other data are logged with my GREDDY Emanage.<br />
Are there a possibility to get the source code?</p>
<p>Thanks for the nice Project<br />
Best regards</p>My Business Card v2 - limpkinurn:md5:80272cbb6147fb781e189acaa93d21cb2014-10-03T23:41:09+02:002014-10-03T22:49:45+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2014/06/16/My-business-card-v2#c2498" rel="ugc nofollow">njneer</a> : Thanks! Please do... it's open source ;-) . Oh right, I forgot to explicitly mention that the ESD protection chip was changed indeed. Your ferrite is indeed alright. The crystal was changed to a 3.2x2.5mm (from a 5x3.2mm IIRC). </p>
<p>The milling was 1mm deep so the flash & leds could be hidden. I can send you solidworks files by email if you want!</p>My Business Card v2 - njneerurn:md5:c4427436a0308cefab40d3a8ac9f26222014-10-03T23:37:05+02:002014-10-03T22:40:54+02:00njneer<p>Really cool build! I hope you don't mind, but I'm trying to use your KiCad source to build one for myself, and hit a few snags that I figured I'd make you aware of. For one, it looks like there were a few changes to the BoM:<br />
USBULC6-2M6, a 6QFPN should now be IP4234CZ6,125, a 6TSOP (that has a different pinout than the USBULC5) <a href="http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=158526443&uq=635479496151270323" title="http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=158526443&uq=635479496151270323" rel="ugc nofollow">http://www.digikey.com/scripts/DkSe...</a></p>
<p>FB1 wasn't in the original board's BoM. I don't know a whole lot about USB circuits, but I'm guessing <a href="http://www.digikey.com/product-detail/en/BLM18PG121SN1D/490-1037-1-ND/584485" title="http://www.digikey.com/product-detail/en/BLM18PG121SN1D/490-1037-1-ND/584485" rel="ugc nofollow">http://www.digikey.com/product-deta...</a> would be a good choice (120 Ohm @100 MHz, 2A limit)</p>
<p>It looks like you're using a different crystal on this than the last one, as the crytal from the previous BoM is so large that it touches the pads for the decoupling caps on the new board when centered. Unfortunately, TXC doesn't make a smaller version of that oscillator, so I'm not sure what you used as a replacement.</p>
<p>For two, I feel like I'm missing something with the KiCad layout for the top board. It seems like there should be some kind of milling where the non-exposed components are. For example, over the flash chip, I realize that you didn't want it exposed, but if there's no milling there at all, the edge of the bottom board can't get flush with the edges of the top board. Similarly, for the LEDs on the ring on the bottom board, it seems like there needs to be half milling on the corresponding location on the top board in order to allow the boards to be flush. I'm used to working in Eagle as opposed to KiCad though... is there a way to specify partial milling (half the thickness of the board) in KiCad? Or did you just place the solder paste on the outer ring thick enough to make up for the height of the flash IC and the 0603 LEDs?</p>
<p>Thanks again for putting this all together!</p>My Business Card v2 - limpkinurn:md5:8a0e75f5807ea9faaf6e83e8320c7b4e2014-07-18T12:10:48+02:002014-07-18T11:11:47+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2014/06/16/My-business-card-v2#c2377" rel="ugc nofollow">euphonistihack</a> : (sorry for the late answer) the top board is indeed 1.6mm and the bottom 0.8</p>My Business Card v2 - euphonistihackurn:md5:54741ac4565451fd14bba9a974cea86c2014-06-25T16:23:42+02:002014-07-18T11:11:47+02:00euphonistihack<p>Another quick question: When you say that the total stack size is "2.4mm high (1.6+0.8)", does that mean you used a PCB thickness of 0.8 for the bottom board and 1.6 for the top? I would think the thicker 1.6 would be the top board to give as much clearance as possible for the components mounted on the bottom board, but wasn't certain.</p>
<p>Thanks again!</p>