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===Clock Control===<br />
Who wants to set the real time when we've got GPS to set it for us?! :) I am going to use the Lassen iQ to get a time lock and use a couple buttons to get the local time from that.<br />
<br />
We need to control 23 channels <b>18:88</b>:<br />
*<b>1</b> has two segments, but the entire number is either on or off<br />
*<b>:</b> is always on, but we may way to flash it for seconds<br />
*<b>888</b> 21 channels<br />
<br />
I decided on 25 channels just in case I need some extra [[http://www.bullshitjob.com/officespace/ 'flare']]. Perhaps an alarm of sorts. 'Beer Time' alarm at 4:30pm? We've got to keep our options open...<br />
<br />
The need for 25 I/O pushed me towards the PIC 16F877A:<br />
*Easy to program (I've got a big code base)<br />
*Has enough I/O<br />
*It can be bootloaded!<br />
*It's got an RTC (when you add an external 32.768kHz xtal)<br />
*UART to read the incoming GPS NMEA from Lassen iQ<br />
<br />
<br />
ToDo : It's possible to reduce the number of channels by multiplexing. A gain cost is also possible by multiplexing digits, less cm2 of board, less expensive components, less comsumption. 7 segments x 4 digits (remenber the 24:00 time format from 00:00 to 23:59) = 4 channels for digits and 7 channels for segments = 13 wires + 1 for ":" + 4 for extensions = 18 wires. Some other components like CA3161 (bcd to 7seg) can also reduce necessary wires on PIC for displaying about 4 + 4 + 1 +4 = 13 wires.<br />
----<br />
<br />
===Light Control===<br />
Well if the PIC 16F877A has got the timing and control down, how exactly do we turn on/off the light stick?<br />
<br />
Since the sticks only pull 60mA, we can use cheap BJT transistors. Let's go solid state! Many itty-bitty SOT-23 SMD BJTs can handle up to 1A with a max input of 40V. The maximum power output is 350mW though. Luckily, when forward biased, the MMBT2222 has around 0.5V drop. <br />
<br />
So 60mA with 0.5V drop, we are looking at 30mW dissapation. That's atleast in theory. I'll believe it when I see it of course. For the time being, I'm going to assume this will work...<br />
<br />
All I need is an NPN BJT for each channel:<br />
<br />
[[Image:Clock-Channel.jpg]]<br />
<br />
While this should work, it's going to leave a bunch of connections with one pin 'hot'. A better design would probably utilize a PNP connected to RAW. Ehh - no big deal.<br />
<br />
If you're planning to use a beefy light source, like Neon or super powerful LEDs, you could easily use the same setup to control a relay. [[Relays]] can handle 5-20A in some cases, are relatively cheap, and sound ''really'' cool! The only problem is they are big. And for this project, we wanted a relatively small control board. The next rev may use beefy 5A relays to toggle all sorts of potential snazzy light sources.<br />
----<br />
===Board Layout===<br />
The PIC is connected to 25 channels, the GPS, a couple buttons, and a status LED. Here's the current layout in all its random glory:<br />
<br />
[[Image:Clock-Layout.jpg|500px]]<br />
<br />
You can see it's a bit dense, but the polarized two-pin connectors should make it easy to attach the light sticks. Everything was SMD to ease the assembly as much as possible. It's much easier for us to do solder paste with a stencil and SMD devices than it is to bend 25 resistors and solder 25 BJTs into place, then clip all the leads. PTH is actually pretty time consuming. I digress...<br />
<br />
There is a switch to multiplex the PIC's RX UART inbetween Debugging and listening to the GPS unit. Be sure to use Port 2 on the Lassen iQ if you want NMEA output (4800bps by default).<br />
----<br />
<br />
===Things to Improve===<br />
<br />
Nothing at the moment. We have to wait for all the parts to come in. Should be about 4 weeks.<br />
<br />
We may need a cover on the light sticks to give more of an opaque presentation. TBD.<br />
----<br />
===Documents===<br />
[[Media:SFE-Wall-Clock.pdf|SFE Wall Clock Main Board Schematic]]<br />
<br />
[[Media:SFE-Wall-Clock-Channels.pdf|Channel Control Schematic]]<br />
<br />
<b>Footprints:</b><br><br />
[[SFE_Footprint_Library|SFE Footprint Library]]<br />
<br />
FP Name: All sorts of FPs used.<br />
<br />
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<b>Related Items:</b><br><br />
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[[Category:Projects]]</div>217.141.109.205http://www.opencircuits.com/index.php?title=OpenCircuits:Community_portal&diff=5929OpenCircuits:Community portal2007-08-04T16:52:38Z<p>217.141.109.205: </p>
<hr />
<div>Welcome to Open Circuits.<br />
This is a good place to talk about Open Circuits, as a whole.<br />
<br />
We have {{NUMBEROFARTICLES}} articles now. Yay!<br />
<br />
== Anti-Vandalism Bot ==<br />
It is my opinion that this should be the top goal for this site to accomplish.<br />
<br />
: ''We recently updated the $wgSpamRegex ( http://www.mediawiki.org/wiki/Manual:%24wgSpamRegex ). It should block nearly all of the kinds of spam we've been seeing in the past. (Use [[Meta:Sandbox]] for testing). --[[User:DavidCary|DavidCary]] 08:46, 6 June 2007 (PDT)''<br />
<br />
Seeing a lot of stubborn spammers. Can we implement some kind of ip blocking mechanism?, that blocks repeated spam ip's for a week or so. Here's a list of known [[spammer ip]].<br />
<br />
== electrical mailing lists ==<br />
Yahoo claims they have<br />
[http://dir.groups.yahoo.com/dir/Science/Engineering/Electrical 1,831 electrical engineering mailing lists].<br />
What would be a good way of letting the people on those lists know about the Open Circuits wiki, without spamming them?<br />
--[[User:DavidCary|DavidCary]] 13:30, 31 May 2006 (PDT)<br />
<br />
* Publish cold fusion howto :-)<br />
* Send one email/week and only once per list. And be on topic, listen carefully for responses.<br />
[[User:Freqmax|Freqmax]] 16:24, 30 July 2007 (PDT)<br />
<br />
== about Open Circuits ==<br />
So, is there any connection between http://OpenCircuits.org/ , http://OpenCircuits.net/ , and this http://OpenCircuits.com/ wiki?<br />
--[[User:DavidCary|DavidCary]] 23:47, 13 June 2006 (PDT)<br />
<br />
No. There is no connection between any of http://opencircuits.com and the other websites listed.<br />
[[User:Chazegh|Chazegh]] 02:55, 18 June 2006 (PDT)<br />
== web rings ==<br />
Document an original microcontroller project and join a PIC webring, or AVR webring. 20 June 2006<br />
<br />
== audio electronics ==<br />
<br />
Is there some other wiki for people to talk about audio electronics?<br />
Or is this Open Circuits the best wiki for talking about things like<br />
''"[http://analog.com/ Analog Devices] AN-221: The Alexander current-feedback audio power amplifier"'' by Mark Alexander<br />
?<br />
<br />
I think I would prefer to offload all the audio electronics controversies to some other wiki<br />
(but which one?).<br />
Still, it would be nice to have some "tips for high-power electronics" here.<br />
I imagine that tips page would list the various quirks of high-power MOSFETs, BJTs, TRIACs, and IGBTs,<br />
and (given a particular motor or speaker or other load)<br />
how to select one over the others,<br />
and various ways of working around those quirks.<br />
--[[User:65.70.89.241|65.70.89.241]] 07:17, 10 August 2006 (PDT)<br />
<br />
I just joined Open Circuits. I have been servicing and designing audio equipment for several years (Recording consoles a specialty) I hope you will have a section for audio electronics. I also work with video projection systems and theatrical lighting (stage struck at an early age) I play electric rock-blues guitar, so I also am interested in tube guitar amps (Marshall and Boogie). And there is a big difference in what a guitar player thinks an amp should do, and what a recording engineer wants an amp for. I think these are valid points for discussion.<br />
I've also got an interest in power supplies (my experience is mostly with linear, but I've started learning about switching designs). In fact that brings me to my question, I have some regulator designs based on the 723 that I'd like to share. How do I go about doing that? I built a replacement for a console /- 18V @6A supply when I couldn't find the original regulator devices. I used 723s with external series pass devices. The unit has been working for close to 10 years now, so I think the design is worth sharing. Is anyone interested? <br />
<br />
I also research discrete op amps like the Jensen 990. I've been working (on and off for years) on a clone of that using more modern, easily available parts and devices. Anyone else?<br />
Finally, in response to the first entry in this section, I too read that application note in Analog Devices Audio/Video Reference Manual. My copy is dated 1992. I've repaired a lot of amplifiers, but haven't built any. If anyone else is hip to this amp I'd like to hear about it. It is a very unique design. I also like the A75 amp design from Nelson Pass and Norman Thagard, and the Leach Amp by Marshall Leach. The last two are pretty normal as far as design goes, not as adventurous as the Alexander with its current-feedback approach.<br />
Aloha, RAF--[[User:66.8.194.185|66.8.194.185]] 14:04, 18 May 2007 (PDT)<br />
<br />
== automotive electronics ==<br />
<br />
Is there some other wiki for people to talk about automobile electronics?<br />
Or is this Open Circuits the best wiki for talking about things like<br />
[http://megamanual.com/ "experimental Do-It-Yourself programmable electronic fuel injection controller"]?<br />
Or should we just point people who want to talk ECUs (engine control units) to the <br />
[http://msefi.com/ MSEFI discussion forum],<br />
even though it sadly lacks a wiki?<br />
--[[User:DavidCary|DavidCary]] 22:36, 2 July 2007 (PDT)<br />
<br />
== inviting bloggers to open circuits ==<br />
<br />
=== how to connect a JTAG probe to a Nokia phone ===<br />
<br />
I'd like to invite bloggers such as GyrosGeier to edit OpenCircuits.<br />
Rather than just spamming him, I think he would be more inclined to help out<br />
if we answered one of his questions first -- such as<br />
[http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."]<br />
Maybe I should start a page on [[JTAG]]...<br />
--[[User:DavidCary|DavidCary]] 09:37, 22 September 2006 (PDT)<br />
<br />
The [http://hackedgadgets.com/ Hacked Gadgets blog also has a bunch of cool electronics].<br />
--[[User:DavidCary|DavidCary]] 11:58, 5 January 2007 (PST)<br />
<br />
== red links ==<br />
<br />
The default skin at OpenCircuits currently has "red links" = page exists, "dark red links" = page does not exist.<br />
<br />
I find that confusing. (But not as bad as the wiki that has some links black-on-white, indistinguishable from normal text).<br />
<br />
'''work-around''': Register (it's free, and you don't have to give any personal information), then choose the "preferences" link in the far upper-right corner and then pick any other skin.<br />
<br />
The other skins have coloring that you may be more used to from other wiki: "blue links" = page exists, "red links" = page does not exist.<br />
<br />
--[[User:DavidCary|DavidCary]] 08:58, 18 December 2006 (PST)<br />
<br />
== inviting people from other forums to open circuits ==<br />
<br />
Lots of people talk about circuits for LED lighting at<br />
http://candlepowerforums.com/<br />
.<br />
Perhaps we can talk some of them into contributing here -- perhaps using a page or two of Open Circuits as a FAQ for LEDs and drive circuits.<br />
<br />
== tool lists ==<br />
<br />
Should we have an entire page on "tools", and mention it on the main page?<br />
That risks listing *every* tool anyone has ever heard about,<br />
like the page at<br />
http://massmind.org/techref/tools.htm<br />
.<br />
Yes, I'm responsible for uglier bits on that page;<br />
I think the wide variety of oscilloscopes are particularly confusing.<br />
How could we cut through the confusion?<br />
<br />
I see the "techniques" page already has a list of software tools.<br />
Perhaps it would be nifty to have a short list of all the tools necessary for each technique?<br />
Then a beginner would have a better idea of what tools he really needs to get (rather than looking at a huge list of every tool, and wondering for each one, ''"Am I going to regret buying it when I see it gathering dust? Or am I going to regret not buying it when I need it during a midnight debug session?"'').<br />
<br />
--[[User:DavidCary|DavidCary]] 08:37, 24 January 2007 (PST)<br />
<br />
== Requests For Help ==<br />
Thanks for your help with the camcorder mic.<br />
<br />
== sample component ==<br />
<br />
What is the purpose of the [[Sample Component]] ?<br />
--[[User:DavidCary|DavidCary]] 16:27, 7 May 2007 (PDT)<br />
<br />
----<br />
<br />
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== MIDI electrical interface ==<br />
<br />
In my opinion, the MIDI interface got a lot of things right that too many later interfaces still trip over.<br />
<br />
* http://www.repairfaq.org/filipg/LINK/F_MIDI.html -- ASCII schematics<br />
* http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/ -- hand-sketched schematics<br />
* http://www.midi.org/about-midi/electrical.shtml "MIDI Electrical Specification Diagram &amp; Proper Design of Joystick/MIDI Adapters" -- well-drawn schematics<br />
* [http://en.wikipedia.org/wiki/The_MIDI_1.0_Protocol Wikipedia: The MIDI 1.0 Protocol]<br />
* http://en.wikibooks.org/wiki/Behringer_FCB1010_MIDI_Pedal<br />
<br />
It may look simple, but too often people try to "improve" it by adding or removing things without understanding, ending up with a worse system.<br />
<br />
Is there any other wiki that is more appropriate for explaining the low-level details of the MIDI electrical interface, and *why* it was done that way?<br />
<br />
I would be most interested in discussing new communication interfaces -- but is this really the right wiki?<br />
Or would http://en.wikibooks.org/wiki/Serial_Programming or the [http://interwiki.sourceforge.net/cgi-bin/picawiki.pl/StartingPoint PICA wiki] be better for discussing improvements?<br />
--[[User:DavidCary|DavidCary]] 13:21, 21 June 2007 (PDT)<br />
<br />
== IC design ==<br />
<br />
What do you think about<br />
http://makeyourownchip.com/<br />
?<br />
Should we talk about VLSI design ([http://david.carybros.com/html/vlsi.html "VLSI: designing electronic chips"])<br />
here at Open Circuits?<br />
Or is there a more appropriate wiki somewhere else?<br />
--[[User:DavidCary|DavidCary]] 15:59, 26 June 2007 (PDT)<br />
<br />
== electronics infoline ==<br />
<br />
So have you seen<br />
"Free electronics projects"<br />
http://electronicsinfoline.com/<br />
"with Photo Preview"<br />
?<br />
--[[User:DavidCary|DavidCary]] 00:28, 1 July 2007 (PDT)<br />
<br />
== generating a netlist with a "C++" program ==<br />
<br />
The [http://positron.ps.uci.edu/~pier/csc/sup/Support.html "Support Electronics for ATLAS Muon CSC"] documentation claims that [http://positron.ps.uci.edu/~pier/csc/sup/CRB_LayoutNotes0.pdf "The design was captured with C++. There are no schematics."] and lists [http://positron.ps.uci.edu/~pier/csc/sup/crb_srce the C++ source code].<br />
<br />
How did they do that?<br />
--[[User:DavidCary|DavidCary]] 01:15, 3 July 2007 (PDT)<br />
<br />
== rocket electronics ==<br />
<br />
Is there another wiki that talks about rocket electronics?<br />
Or is this Open Circuits the best place to talk about<br />
ground support electronics<br />
(such as [http://www.ukrocketman.com/rocketry/controller.shtml Launch Controller]s)<br />
and <br />
onboard electronics<br />
(such as one<br />
[http://www.ukrocketman.com/rocketry/compactrdasguide.shtml flight computer]<br />
or another<br />
[http://david.carybros.com/html/schematic.html#flight_computer flight computer]<br />
)?<br />
--[[User:DavidCary|DavidCary]] 14:21, 15 July 2007 (PDT)<br />
<br />
== Minimig ==<br />
I have created pages about the [[Minimig]] project which is running an Amiga 500 in a Xilinx FPGA. It's rather a work in progress, than a static documentation. I hope nobody minds. [[User:Freqmax|Freqmax]] 18:35, 27 July 2007 (PDT)</div>217.141.109.205http://www.opencircuits.com/index.php?title=Sample_Component&diff=5925Sample Component2007-08-04T16:31:13Z<p>217.141.109.205: </p>
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