OpenCircuits - User contributions [en]

Xbee wireless module

2007-10-25T16:54:24Z

207.248.164.199:

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all ovest niente di nuovo] [http://enadilit.sprag.info/ enadil it] [http://fameinafrica.berhym.info/ fame in africa] [[Image:Grey-bg-xbee.jpg]]

Description: 
Xbee is a wireless communication module from [http://www.maxstream.net Maxstream] built to the 802.15.4 standard. By default it is configured from the factory to be a wireless serial line replacement. It can be programmed to do other functions like join [http://www.zigbee.org ZigBee] networks or transmit level changes of certain module I/O pins.

There are two flavors of this module: Xbee and Xbee Pro. The pro version has an increased range:

XBee
*Indoor/Urban: up to 100’ (30 m)
*Outdoor line-of-sight: up to 300’ (100 m)
*TX Current: 45 mA (@3.3 V)
*RX Current: 50 mA (@3.3 V)
*Power-down Current: < 10 μA

XBee-PRO
*Indoor/Urban: up to 300’ (100 m)
*Outdoor line-of-sight: up to 1 mile (1500 m)
*TX Current: 215 mA (@3.3 V)
*RX Current: 55 mA (@3.3 V)
*Power-down Current: < 10 μA
 

Documents: 
[http://www.maxstream.net/products/xbee/datasheet_XBee_OEM_RF-Modules.pdf Datasheet] from [http://www.maxstream.net Maxstream] 
[http://www.maxstream.net/products/xbee/manual_xb_oem-rf-modules_802.15.4.pdf 804.15.2] mode of operation 
[http://www.maxstream.net/products/xbee/manual_xb_oem-rf-modules_zigbee.pdf ZigBee] mode of operation 

Footprints: 

The module is mounted on a mini-pcb with 2 10pin 2mm pitch headers. See the datasheet for more info.

[http://www.sparkfun.com Sparkfun Electronics] now makes a [http://www.sparkfun.com/commerce/product_info.php?products_id=8276 breakoutboard] that converts the 2mm pitch pins into 0.1" pitch pins. They also sell [http://www.sparkfun.com/commerce/product_info.php?products_id=8272 2mm header sockets] to use in your projects.

[[Category:Modules]]

PG31 GPS USB Dev Board

2007-10-25T13:27:58Z

207.248.164.199:

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|-
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[[Image:Main-Eval-PG31-USB-Loaded.jpg|PG31 USB Dev Board]]
|}
Description: You've probably heard about the CP210x USB ICs from Silicon Labs, now here's an application that uses it. The CP2102 gives us 3V TTL to a VCP (virtual comm port) over USB as well as generating the 3.3V needed for the board.

In this project we demonstrate how to:
*Setup a USB to Serial link
*Use the CP2102 for 3.3V
*Use a SMD 12mm battery holder

----
===USB Connection===
The CP2102 USB IC is fairly easy to use once you've plugged it down a couple times.

[[Image:PG31-USB-Connection.jpg|PG31 USB Connection]]

The USB connector has four pins : Vcc (*around* 5V), GND, D , D-. Tying these four connections to the CP2102 is easy enough.

[[Image:PG31-USB-Connection-Schematic.jpg]]

There are a couple things to note. In this setup, we do not have any ESD protection or surge supression. We are quite possibly violating some USB standards. But does it work? Yep.

When you configure the CP2102 this way, it can source up to 100mA at 3.3V using its internal voltage regulator. This is perfect for our application as the PG31 needs ~40mA at 3.3V.

Note the TX pin on the CP2102 is an output and needs to be connected to the RX pin on the PG31. This screwed me up a few times.

The CP2102 has built-in cystal and eeprom. These means you need very few external components to get it working. You can even program in your own ID string so when you plug it onto your computer, it comes up with the name of your widget!

When the CP210x is attached to a computer (and it's soldered correctly) you will see windows hardware wizard request drivers. These drivers can be downloaded from SI Labs. You can also create ''your own signature drivers'' using some SI Labs software.

You can also program the internal EEPROM to reflect your own product ID and serial strings. This software is from SI Labs as well but I forget were - when someone finds it, post it here.

Once the drivers are installed, the CP210x will turn into a serial com port! Yes! It's weird to think about until you see it happen. So this USB dev board now acts like a com port on my computer. All I have to do is pass characters in and out COM 5 (for example) and I can do things over USB! No messy drivers, no protocols to think about, it's all done in the IC. All right!

One thing to note
1000
when you are using the CP210x ICs, the Linux community may scoff. SI Labs did a great job with the windows support, but a piss-poor job of opening the drivers for the open-source community. I'm not really a Linux person so it didn't effect me. But if your app needs linux connectivity, you may want to take a quick look for other potential ICs. Last I heard, there was good Linux support for the CP2102, but there was nothing for the CP2103 GPIO control...

One last con : The ICs come in QFN leadless package only. YES it can be soldered by hand, but you'll need some experience and/or some good hot-air soldering tools. I taught myself how to rework stuff using this IC. You really can't destroy it, but you can certainly delaminate (kill) the PCB if you heat it for excessive amounts of time. Don't 'not' create a PCB or a design because of silly SMD parts. They're not that hard to solder!

----

===Battery Backup===

[[Image:12mm-Holder.jpg|12mm coin cell holder]]

If you're playing with GPS, you've ''got to have a battery backup''. The 12mm coin cell lithium allows the PG31 (and many other GPS receivers) to retain the alamanac data. This small battery provides just enough juice for 3-5 years. By having alamanac data at power on, the GPS receiver will be able to do a warm lock instead of a cold lock. Cold locks take 1-2 minutes, warm locks, as little as 30 seconds. The alamanac data, in effect, allows the GPS receiver to 'guess' where it is in the world ("Last time I was on I was in Ohio, therefor, I will assume I'm near there").

If you're unfamiliar with Lithium Coin Cells - they come in a couple different sizes. I prefer 12mm just cause it's small but beefy enough to do most of the BBR (battery backed ram) that we need to support. The battery itself has a postive top (noted by the plus) and a ground on the bottom. You normally create a pad on the PCB for the ground and the coin cell holder is positive. We've learned the hard way that the bottom part of the cell is sometimes concave. This means that when you slide the coin cell onto the board, the concave ground part of the cell may not contact the PCB pad very well. If you're using a paste stencil, just leave a cutout for this pad. The extra paste will add 5-10 mils of solder to the pad. If you're solder the thing by hand, add a little blob of solder to this ground pad to give it some height. When you insert the battery, it should ride nicely on top of the ground pad blob.
----
===PG31 Footprint===
[[Image:PG31-Footprint.jpg]]

Now about the footprint for the PG31. Unless the manufacturer hands you a foorprint file or a simple, recommended FP in the datasheet, you're going to have to go it on your own. We took the PG31 and a pair of calipers and went at it. It can be extremely difficult the first time. This PG31 FP took me twice to get correct. Do the best you can and try to account for things like the antenna connector. The second rev FP, I forgot to account for the MMCX connector, I put the DB9 connector right up against the PG31, and Viola - useless PCB! a.k.a another coaster for my coffee cup. But once you've got the FP, you're good for all future projects using that device. Now you know when engs hate to change parts...

----
===Final Layout===
[[Image:PG31-USB-Layout.jpg|300px]]

You can see the PCB layout is pretty straight forward. The 'solder jumpers' are a feature that SFE came up with to minimize our manufacturing time while allowing end users to populate the physical jumpers if they needed the ability to connect/disconnect a feature often and quickly. Most users just plug the PG31 onto their computer for quick evaluation. At some point, the CP2102 IC may need to be disconnected from the circuit so that an external micro or embedded system could be attached. If this is done back and forth often, the end user can clear the solder jumper with a swipe of the soldering iron, install a 2-pin header and a black plastic jumper. This now allows them to jumper/dejumper quickly and keeps us from having to solder the 2-pin headers into a board that may not need them
1000
.

----

===Things to Improve===
So that's pretty much it. The board works well, and assuming Laipac doesn't change their parts again, we will produce the board for some time.

We may consider migrating to a different USB IC someday but the CP2102 continues to be a really simple to use USB to UART IC.
----
===Documents===
[[Media:PG31 USB Schematic.pdf|PG31 USB Schematic]]

[[Media:PG31 USB Carrier - Protel.zip|PG31-USB Protel File]]

[[Media:PG31 USB Carrier - Gerbers.zip|PG31-USB Gerber Files]]

Footprints: 
[[SFE_Footprint_Library|SFE Footprint Library]]

FP Name: PG31

Supplier Info:
Spark Fun Electronics part # : Eval-PG31-USB 
Single Piece Price : $29.95

Related Items:

* [[PG31 GPS RS232 Dev Board]]

[[Category:Projects]]

POV display

2007-10-25T13:26:09Z

207.248.164.199:

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== further reading ==
Spoke-POV and propeller clocks links:

* An entire discussion forum devoted to POV displays http://www.ladyada.net.nyud.net:8090/forums/viewforum.php?f=11
** In particular, lots of nice pictures http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?p=4712
** 'no-microcontroller-programmer-needed' minipov http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?t=32
* LEDtoy on Sourceforge http://ledtoy.sourceforge.net/
* Ian’s Spoke POV http://www.ianpaterson.org/projects/spokepov20050704/index.htm
* "Propeller Clock" Mechanically Scanned LED Clock: by Bob Blick http://www.bobblick.com/techref/projects/propclock/propclock.html (I think this is the original POV display)
* micro POV display http://positron.org/projects/mpov/ small enough for "glueing it to my shaved head."

----

Is this http://led-display-and-design-swicki.eurekster.com/ relevant?

I think so--[[User:71.234.233.163|71.234.233.163]] 18:06, 22 June 2007 (PDT)

WikiNode

2007-10-25T01:54:50Z

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[http://nikeairmax3.roof-top.info/ nike air max 3] [http://lightnet.driven4.info/ light net] [http://veneziapalestra.wellso.info/ venezia palestra] [http://studentesselesbiche.youtells.info/ studentesse lesbiche] [http://ritidigitalimaschere.youtells.info/ riti digitali maschere reali] [http://lexmark-x2330.roof-top.info/ lexmark - x2330] [http://reedbook.wellso.info/ reedbook] [http://thomsonmp3gb.roof-top.info/ thomson mp3 gb] [http://jvctelevisioni.snorke.info/ jvc televisioni] Welcome to Open Circuits.
Open Circuits is a wiki for sharing electronics knowledge, schematics, board layouts, and parts libraries.

== key points of interest ==

* [[Main Page]]
* [[Open_Circuits:Community_Portal]]
* [[Projects]]
** open hardware cell phone projects: [[Open Mobile Gadgets]], [[Cellular Rotary Phone]]
* [[Components]]
* [[Techniques]]

== wiki-nodes of neighboring wiki ==

open hardware cell phone wiki:

* [http://opencellphone.org/ TuxPhone wiki at http://opencellphone.org/]
* [http://hbmobile.org/wiki/ Homebrew Mobile Phone Club wiki at http://hbmobile.org/wiki/]
* [http://widgetry.org/dokuwiki/ OpenCell wiki at http://widgetry.org/dokuwiki/]
* [http://wiki.openmoko.org/ OpenMoko wiki at http://wiki.openmoko.org/] discusses open hardware cell phone you can buy now.
* [http://iphone.fiveforty.net/wiki/ wiki for open-source software for a popular (but proprietary hardware) phone]

other open wireless communications wiki:

* [http://wsn.oversigma.com/ WSN, the Wireless Sensor Network wiki] discusses wireless sensor networks. (wired sensor network discussion is also tolerated :-).
* [http://wiki.twibright.com/ a wiki for RONJA] (Reasonable Optical Near Joint Access) Free Space Optics device[http://en.wikipedia.org/wiki/RONJA]. ("free technology" is the same as "open hardware", right?)
* [http://wiki.openwrt.org/ OpenWRT wiki]: "OpenWrt is an open source project to create a free embedded operating system for network devices."

other related wiki:

:For open source software (or open source in general) visit the [http://opensource.wikia.com/wiki/Main_Page Open Source Wikia].

* [http://adciv.org/ the advanced civilization wiki] discusses "Open collaborative design", which seems to include the sort of [[open hardware]] designs we share at Open Circuits.
* [http://openservo.com/ OpenServo wiki] -- developing a digital servo motor that accepts "Go to position X" commands and also more complex curves, and returns actual servo position, speed, voltage and power consumption.
* [http://electronicschat.org/ the Electronics Chat wiki]
* [http://hcvl.hci.iastate.edu/cgi-bin/openEyeswiki/index.cgi the openEyes wiki] discusses an open-source open-hardware toolkit for low-cost real-time eye tracking.
* [http://wiki.asiaquake.org/openeeg/published/WikiNode the OpenEEG wiki] discusses building an OpenEEG, safe ways to attach it to your head, and software for it.
* [http://communitywiki.org/odd/ComputerComponent/WikiNode Computer
1000
Component wiki] "for computer and electronics enthusiasts to learn and contribute to an online database of computer hardware and electronics with an emphasis on how-to guides."

* [http://nslu2-linux.org/ the NSLU2-Linux development group] seems to do a lot of wiring and soldering. ''needs wiki-node''
* [http://wikidevices.org/ Wiki Devices] "a highly organized repository for objective information, as well as opinions on consumer electronics."
* [http://wikiindex.com/Build_Your_Own_Arcade the Build Your Own Arcade controls wiki]
* [http://www-robotics.usc.edu/~dshell/roboticswiki/ Robotics wiki] ''(offline as of 2007-07-07)''
* [http://geda.seul.org/wiki/ the gEDA wiki] discusses "the gEDA project" -- developing a full GPL‘d suite of Electronic Design Automation tools (electrical circuit design, schematic capture, simulation, prototyping, and printed circuit board (PCB) layout.
* microcontroller wiki:
** [http://gainer.cc/wiki/ the Gainer wiki] discusses the Cypress PSoC microcontroller
** [http://avrwiki.com/ the Atmel AVR wiki] discusses the Atmel AVR series of microcontrollers
** [http://techref.massmind.org/techref/piclist/ the PICList at the massmind] and [http://oase.uci.kun.nl/~mientki/wikifarm/stef/index.php PiciWiki] discusses the Microchip PIC series of microcontrollers
** [http://www.open-research.org.uk/ARMuC/ the ARM microcontroller wiki]
** [http://gnusim8085.sourceforge.net/ the GNUSim8085 wiki] for the Intel 8085 microprocessor
** [http://nioswiki.jot.com/ Nios community wiki] discusses the Nios II processor, and how to implement it on a FPGA
** [http://jopdesign.com/wiki/index.php the JOP wiki discusses the Java Optimized Processor, a simple and small Java processor optimized to execute Java bytecode, implemented in a low cost FPGA]
** [http://wiki.opensparc.net/ the OpenSPARC Wiki] discussing open-source versions of the SPARC processor architecture, including implementing it in a FPGA
* [http://en.wikibooks.org/wiki/Embedded_Systems the Embedded Systems wikibook]
* [http://sensorwiki.org/ the sensor wiki]
* [http://linuxtv.org/wiki/ the LinuxTV wiki] occasionally has some chip-level information, such as the [http://linuxtv.org/wiki/index.php/I2c_Protocol I2C protocol] and [http://linuxtv.org/wiki/index.php/BT878 sampling analog data at 16 bits and 448000 Samples per second with a BT878 chip]
* [http://howto.wikia.com/wiki/WikiNode WikiHowto] occasionally has electronic projects such as [http://howto.wikia.com/wiki/Howto_build_an_ultra_low_power_clock_with_a_large_period WikiHowto: Howto build an ultra low power clock with a large period]
* [http://wiki.duskglow.com/ The Open Graphics Project (OGP) is developing graphics cards with fully published specs and open source drivers.] Since the first version will be a FPGA, is also collecting information on FPGA programming and interfacing.
* [http://elinux.org/ the embedded Linux wiki] has information on running Linux on several small ARM-based embedded systems. Also TexasInstruments OMAP processors.
* [http://wikihost.org/wikis/openhardware/ the Open Hardware wiki] has electronics projects of various levels of complexity; the most complicated appears to be "KAD", a FPGA on a PCI card designed for reconfigurable computing.
* [http://pminmo.com/PMinMOwiki/index.php5 the PMinMO.com wiki] describes an open-source CNC machine -- software, electronics, motors, hardware, etc. -- and related information, such as [http://pminmo.com/PMinMOwiki/index.php5?title=CNC_PCB_Milling CNC PCB milling]. (was: [http://pminmo.com/wiki/] ) ''needs WikiNode''
* [http://linuxrobots.org/wiki/WikiNode Linux Robots] -- robots that run Linux
* [http://protel-users.org/ Protel users wiki], for people who design and draw schematics and circuit boards with Protel.
* [http://elinux.org/wiki/ embedded Linux wiki] ''needs wikinode''
* [http://vems.hu/wiki/ VEMS wiki] has some interesting electronics projects. In particular, the [http://www.vems.hu/w
1000
iki/index.php?page=GoBox GoBox project] to tune automobile engines to minimize the amount of fuel used. ''needs wikinode''
* various small CPU modules that have their own wiki (see also [[ARMUS Embedded Linux Board]] )
** [http://balloonboard.org/balloonwiki/WikiNode Balloonboard Wiki] for the Balloon Project. They have developed a small single-board computer that can run Linux. Also discusses "The Balloon Open Hardware License (BOHL) ... The license is intended as a general purpose open hardware license".
** [http://docwiki.gumstix.org/ gumstix wiki] : "[http://docwiki.gumstix.org/Schematics Schematics and layouts for all gumstix expansion boards] are available under a Creative Commons license." ''needs wikinode''
** [http://virtualcogs.com/wiki/ Virtual Cogs wiki] describes a CPU board that uses a stacking connector system.
** [http://wiki.emqbit.com/free-ecb-at91 the emQbit wiki] discusses "The Free ECB_AT91 V1 is a Single Board Computer made by emQbit. You can download the specs and build your own." based on a 180 MHz ARM9 processor (Atmel AT91RM9200); runs Linux.
* [http://openjtag.net/ the OpenJTAG wiki] ( http://openjtag.net/ )
* [http://reprap.org/bin/view/Main/WebHome the RepRap wiki] discusses the RepRap project to build a "Replicating Rapid-prototyper", a self-copying 3D printer. "Complete open-source instructions and plans are published on this website for zero cost and available to everyone so, if you want to make one yourself, you can."
* [http://analogwiki.com/ the Analog wiki] "The Wiki for Design

Help:Contents

2007-10-24T23:24:06Z

207.248.164.199:

botabas
What the heck is this place? 
So Cina, Nate, and a guy named Aubry were all working on similar cellular projects using the [[GM862 Cellular Module]] but each project was different enough that we could not collaborate directly. However, we noticed that there was enough overlap between projects that certain things should be shared. Things like the audio biasing circuit, the power supply, and the footprint for various exotic parts. We wanted an easy way to share this information with others as well, and the concept of Open Circuits was born. 

We got the framework up (Cina is a pimp) in about 24hours. Even if you are completely new to Wikis, we're sure you'll find things fairly straight forward. Please use the following template (edit this change and copy/paste) into your posting as a starting point. 

----

Want to know [[How to delete spam]]?

----

''(FIXME: move the following description to [[LT1528]])''

{| align=right
|-
|
[[Image:Main-LT1528.jpg|LT1528]]
|}
Description: The LT1528 is a rather expensive regulator that is known for its fast transient response and high current output. Really its known because Telit recommends it for the GM862.

Documents: 
[[Media:LT1528.pdf|LT1528 Datasheet]]

Footprints: 
Coming in a minute from SFE. This regulator comes in two packages. The 5-DD is the SMD version, while the TO-220-5 is the through hole version.

Manufacturer Info: 
Linear part # : 
LT1528CQ (5-DD SMD Package) 
LT1528CT (TO-220-5 PTH Package)

Supplier Info: 
Digikey part # : LT1528CQ-ND 
Single Piece Price : $7.13

Related Items: 
[[GM862 Cellular Module]] 
[[GM862 SMD Connector]]

Original Creator: --[[User:Sparkfun|Sparkfun]] 22:18, 25 January 2006 (PST)

== Help ==
Why can't I upload a *.cam file. It is used by Eagle for cam processors. There should be a better why to get help than posting to this page. --[[User:Linuxvolts|Linuxvolts]] 19:58, 23 May 2007 (PDT)

Talk:ARMUS Embedded Linux Board

2007-10-24T23:23:49Z

207.248.164.199:

zelerletosit
Hello David,
The ARMUS embedded linux board looks very intresting, but it miss the software part, Would u please add the software part so to allow intrested colleagues to have a complete view of the project and improve it afterwards ?
Thanks in advance,
Samer Elghandour

Dear Samer Elghandour,

Alas, I don't know anything more about it than what is posted here.
One of our other volunteers posted that information here.

I suspect that project uses a fairly standard [http://www.open-research.org.uk/ARMuC/Embedded_Linux.html Linux port to the ARM microprocessor].

--[[User:DavidCary|DavidCary]] 19:31, 21 October 2007 (PDT)

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