http://www.opencircuits.com/api.php?action=feedcontributions&user=63.238.216.253&feedformat=atomOpenCircuits - User contributions [en]2024-03-28T23:57:01ZUser contributionsMediaWiki 1.34.2http://www.opencircuits.com/index.php?title=Xbee_wireless_module&diff=12521Xbee wireless module2007-12-30T23:49:08Z<p>63.238.216.253: </p>
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[http://theolathurman.325mb.com/article/batman-the-animated.html batman the animated series] [[Image:Grey-bg-xbee.jpg]]<br />
<br />
<b>Description:</b><br> <br />
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. <br />
<br />
There are two flavors of this module: Xbee and Xbee Pro. The pro version has an increased range:<br />
<br />
XBee<br />
*Indoor/Urban: up to 100’ (30 m)<br />
*Outdoor line-of-sight: up to 300’ (100 m)<br />
*TX Current: 45 mA (@3.3 V)<br />
*RX Current: 50 mA (@3.3 V)<br />
*Power-down Current: < 10 μA<br />
<br />
XBee-PRO<br />
*Indoor/Urban: up to 300’ (100 m)<br />
*Outdoor line-of-sight: up to 1 mile (1500 m)<br />
*TX Current: 215 mA (@3.3 V)<br />
*RX Current: 55 mA (@3.3 V)<br />
*Power-down Current: < 10 μA<br />
<br><br><br />
<br />
<b>Documents:</b><br><br />
[http://www.maxstream.net/products/xbee/datasheet_XBee_OEM_RF-Modules.pdf Datasheet] from [http://www.maxstream.net Maxstream]<br><br />
[http://www.maxstream.net/products/xbee/manual_xb_oem-rf-modules_802.15.4.pdf 804.15.2] mode of operation<br><br />
[http://www.maxstream.net/products/xbee/manual_xb_oem-rf-modules_zigbee.pdf ZigBee] mode of operation<br> <br><br />
<br />
<b>Footprints:</b><br><br />
<br />
The module is mounted on a mini-pcb with 2 10pin 2mm pitch headers. See the datasheet for more info.<br />
<br />
[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.<br />
<br />
[[Category:Modules]]</div>63.238.216.253http://www.opencircuits.com/index.php?title=Fermenter_Controller&diff=12491Fermenter Controller2007-12-30T09:16:31Z<p>63.238.216.253: </p>
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spring break page] [http://lucianagilkey.325mb.com/take-me-home.html take me home tonight] [http://melonyofarrell.my3gb.com/directory/the-little-prince.html the little prince] [http://canyondrey.ibelgique.com/topic/literary-agents.html literary agents children books] [http://larondaglen.ifrance.com/data/option-arm-program.html option arm program] [http://ariericher.my3gb.com/library/smallest.html smallest] [http://theolathurman.325mb.com/article/order-pizza-online.html order pizza online toronto] [http://cdn-slave.isuisse.com/blog/low-rides.html low rides] [http://shonnaculbert.ifrance.com/lib/sports-handicapping.html free sports handicapping] [http://bernarao.my3gb.com/sanford-airport.html sanford airport] [http://coribergquist.ifrance.com/pages/office-of-special.html office of special counsel immigration] ===Project Scope===<br />
<b>Description:</b><br> My [[http://mec-symonds.eng.monash.edu.au/cgi-bin/twiki/view/Saqqara/Md420 Md420]] fermenter controller belongs to the [[http://mec-symonds.eng.monash.edu.au/cgi-bin/twiki/view/Saqqara/PyPicn PyPicn]] family of projects. <br><br />
The PIC 18F252 microcontroller unit controls a refrigeration assisted cooling system and heaters to maintain the fermentation cabinet temperature. External, internal and vessel temperatures are measured and logged. The temperatures where I live vary greatly and as the cabinet is an old gutted fridge sitting outside it its exposed to the elements and therefore requires a decent heating/cooling setup.<br><br />
The cabinets air can be circulated using a fan driven exhaust system. This prevents gas build up, stops temperature layers forming and can be used to aid the heating/cooling system by comparing the set point with outside temperature. Fermentation is exothermic, especially so when your fermenting substances other than beer ;) Sucking in the cool night air is a very good, non power hungry, way of cooling.<br><br />
The (GTK)gui and software is written in python and works on windows and Linux alike. It talks to the PC's serial port using TCP sockets thus allowing multiple connections to the one device.<br />
* For example. One python script is used to collect data, temperatures etc and log/ display graphs.<br />
** A second script simultaneously requests data and can re configure if required the control features.<br />
** A third can collect data for a web page. etc etc<br />
* some [[http://mec-symonds.eng.monash.edu.au/cgi-bin/twiki/view/Saqqara/PicViewSnaps screenshots]] which reminds me they need updating.<br />
* Its by no means a simple solution.<br />
Remote access to the data and control aspects can of course be reached thru an ssh tunnel via the internet.<br />
----<br />
<br />
==Extension==<br />
*The [[http://mec-symonds.eng.monash.edu.au/cgi-bin/twiki/view/Saqqara/PyPicn PyPicn]]system can and is used to control all manner of Home automation and other devices across the web or locally. Various "black boxes" like the fermentation [[http://mec-symonds.eng.monash.edu.au/cgi-bin/twiki/view/Saqqara/Md420 Md420]] collect and control various devices.<br />
*** Its an extension of a work related project<br />
----<br />
<br />
===Online Demo===<br />
You can visit the web page of a similar project.<br />
* [[http://mec-symonds.eng.monash.edu.au/cgi-bin/twiki/view/Saqqara/RoomMonitor Room Monitor]]<br />
<br />
[[Category:Projects]]</div>63.238.216.253http://www.opencircuits.com/index.php?title=PG31_GPS_RS232_Dev_Board&diff=12488PG31 GPS RS232 Dev Board2007-12-30T04:33:11Z<p>63.238.216.253: </p>
<hr />
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rank] [[Image:Main-Eval-PG31-RS232.jpg|PG31 RS232 Dev Board]]<br />
<br />
<b>Description:</b><br> Getting information from your project to your computer can be difficult at first. Once you discover how to setup an RS232 connection, it's really just cut-and-paste for future projects. <br />
<br />
In this project we demonstrate how to:<br />
*Setup an external power supply<br />
*Setup 3.3V to RS232 circuit<br />
*Complex PG31 GPS footprint<br />
<br />
----<br />
===Power Regulation===<br />
First we will start with a simple adjustable voltage regulation circuit:<br />
<br />
[[Image:PG31-PowerSupply.jpg|PG31 Power Supply]]<br />
<br />
Please note this is a relatively compact SMD version of the power supply. This can easily be obtained with through-hole components using a breadboard. Here is the schematic:<br />
<br />
[[Image:PG31-PowerSupply-Schematic.jpg]]<br />
<br />
Now let's discuss what's going on here. The barrel jack (J1) is a basic 5.5mm OD 2.1mm ID type jack. We get an unregulated 9-13V out of the wall wart. <br />
<br />
The D3 large diode MBRA140 is for reverse protection. It can handle up to 1A and prevents damage to the board if a center-negative wallwart is attached. This diode will cause a ~0.5V drop from whatever the wall-wart is outputting.<br />
<br />
C2 ([[10uF Tantalum Capacitor]] in this case) is a basic decoupling cap. 10-100uF is adequate but should be rated for 15-25V.<br />
<br />
U1 is the LM317 (or LM1117 in SMD form) adjustable [[Basic_Voltage_Regulators|voltage regulator]]. It will take in some larger voltage and output a set voltage. The output voltage is set with two external resistors. R1 is historically 240 and value for R2 is different for different required output voltages. In our case, we want 3.3V out of the regulator, so R2 is set to 715. The LM317 is good because it is variable, the SOT-223 package is nice becuase it can take a relatively large voltage on the input (25V max I believe?) and has decent heat dissapation. <br />
<br />
C1 and C3 are decoupling caps that help clean up the output transcients and noise.<br />
<br />
J2 is just a two pin polarized header so that you can either 'steal' 3.3V from the board to power other boards, or have other boards power this board without the need for the external wall wart.<br />
<br />
----<br />
<br />
===RS232 Interface===<br />
So we've got a nice clean output of 3.3V from the regulator, let's look at the RS232 connection:<br />
<br />
[[Image:PG31-SerialConnection.jpg|PG31 Serial Connection]]<br />
<br />
This shows the DB9 connector (also known as a D-Sub 9-pin connector), serial cable, and MAX3232 IC and charge pump caps (all SMD, again, can be done with PTH components). Here is the schematic:<br />
<br />
[[Image:PG31-SerialConnection-Schematic.jpg]]<br />
<br />
Now read-up on the MAX232 IC. It could be the most common IC out there, at least for the embdded world. This IC will have many different model names (ICL232 for example) but all do the same thing, and will most likely have identical pin-outs. This IC is used to take low voltage signals from your micro or PIC or ARM or whatever, and converts those low-voltage signals to higher-voltage signals that the computer can understand. The voltage levels on TTL are also inverted for RS232 so the MAX232 takes care of that as well!<br />
<br />
The MAX232 takes in TTL signals and sends out RS232 signals. It also takes the RS232 signals from the computer and outputs TTL signals to whatever microcontroller you are using. How does it do this magic? With charge pump capacitors. You'll notice four 0.1uF caps attached to the MAX3232. If you're reading closely, you'll also notice we have a MAX3232 not the MAX232. Difference:<br />
*MAX232 must be powered with 5V and converts 5V TTL<->RS232<br />
*MAX3232 can be powered from 3V to 5V and converts it to RS232<br />
<br />
So in this application, the GPS unit is running at 3.3V. If we were to send 5V TTL to it, it would be damaged! So we must use the lower voltage MAX3232 part. No big deal, it's functionally identical to the MAX232. From here on out, I will only refer to the MAX232.<br />
<br />
When you first view the MAX232 component, it can be a bit confusing. The pins label T1/T2 are the transmit channels (MAX232 has 2 TX channels and 2 RX channels). T1In/T2In will take *in* TTL and send *out* RS232 out T1Out/T2Out. So for our purposes, we need to connect the GPS unit's serial TX pin to the T1In pin of the MAX232. So when the GPS unit outputs some 3.3V TTL signals, these signals will be converted into RS232 and sent to the computer (TX1Out is connected to pin 2 on the DB9 connector).<br />
<br />
Finally, when the computer needs to send info to the GPS unit, it will send RS232 signals down the serial cable, on pin 3 of the serial cable/DB9 connector to R1In of the MAX232. This RS232 signal will be converter to TTL and sent out the R1Out pin. This TTL signal is connected to the RX pin on the GPS unit. Voila.<br />
<br />
I can't tell you how many times I've crossed TX and RX on different projects. Sit down, think about it, and once you've got it wired correctly, cut and paste into future projects.<br />
<br />
----<br />
<br />
===PG31 Footprint===<br />
[[Image:PG31-Footprint.jpg]]<br />
<br />
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 why engineers hate to change parts...<br />
<br />
----<br />
<br />
===Final Layout===<br />
[[Image:PG31-Layout.jpg|300px]]<br />
<br />
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 MAX232 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.<br />
<br />
----<br />
<br />
===Things to Improve===<br />
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.<br />
<br />
----<br />
===Documents===<br />
[[Media:PG31-RS232 Schematic.pdf|PG31-RS232 Schematic]]<br />
<br />
[[Media:PG31 RS232 Carrier - Protel.zip|PG31-RS232 Protel File]]<br />
<br />
[[Media:PG31 RS232 Carrier - Gerbers.zip|PG31-RS232 Gerber Files]]<br />
<br />
<b>Footprints:</b><br />
[[SFE_Footprint_Library|SFE Footprint Library]]<br />
<br />
FP Name: PG31<br />
<br />
<b>Supplier Info:</b><br />
Spark Fun Electronics part # : Eval-PG31-RS232<br><br />
Single Piece Price : $29.95<br />
<br />
<b>Related Items:</b><br />
<br />
* [[PG31 GPS USB Dev Board]]<br />
<br />
[[Category:Projects]]</div>63.238.216.253http://www.opencircuits.com/index.php?title=Integrated_Circuits&diff=12477Integrated Circuits2007-12-29T23:04:53Z<p>63.238.216.253: </p>
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[[Digital Potentiometers|Digital Potentiometers(AD5204)]]<br />
The digital Potentiometers made by analog devices (AD5204) has 255 positions can be adjusted by the microcomputer that can receive commands from the computer. This is a great way for analog circuitry to have digital control. This is a chip with 4 digitally controlled POTs and the pots can be daisy chained to have multiple chips controled by a single SPI interface.<br />
<br />
Unlike a mechanical POT, digial POTs often have the restriction that the three terminals of the POT needs to be < VCC and > GND making these devices harder to use in applications such as LCD contract adjustment where the contrast is controlled by a voltage lower then GND.<br />
<br />
== Voltage Regulators ==<br />
{|<br />
! colspan="2" align="left"| Linear Regulators<br />
|-<br />
| align="center"|[[Image:Main-LT1528.jpg|69px|LT1528]]<br>[[LT1528]]<br />
| High current, Variable Voltage Regulator<br />
|-<br />
| align="center"|[[Image:TPS-V-Reg.jpg|69px|TPS V-Reg]]<br>[[TPS V-Regs]]<br />
| These are 3.3V and 5V LDO, Low-Noise Voltage Regulators. Very small SOT-23 SMD package. 150mA max current. Best used in battery applications.<br />
|-<br />
| align="center"|[[Image:Main-LM7805.jpg|69px]]<br>[[Basic Voltage Regulators]]<br />
| Variable voltage regulators, set output regulators, we give you the whole breakdown. Perfect for use with an external wall-wart power supply.<br />
|-<br />
| align="center"| [[Image:UA723CN_Symbol.gif]]<br>[[The 723 Voltage Regulator]]<br />
| Precision Voltage Regulator. Can be used as fixed or floating, variable, linear or switching. <br />
'''NOTE:''' Only the DIP-14 version (image) has the Vz pin, which is used for negative regulators. The Metal Can and the Flat-Pack do not have enough pins so exclude the Vz.<br />
|-<br />
|</div>63.238.216.253http://www.opencircuits.com/index.php?title=Modules&diff=12471Modules2007-12-29T22:10:33Z<p>63.238.216.253: </p>
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[http://tee-docs.isuisse.com/web/scoggin-dicky.html scoggin dicky parts center] [[Image:Main-GM862-0.jpg|70px|GM862]] [[GM862 Cellular Module]]<br />
<br />
[[Image:Main-WiTilt-v2-0.jpg|70px|BlueTooth Accelerometer]] [[BlueTooth Accelerometer (SparkFun)]]<br />
<br />
[[Image:Grey-bg-xbee.jpg|70px|Xbee]] [[Xbee wireless module]]<br />
<br />
[[Category:Modules]]</div>63.238.216.253http://www.opencircuits.com/index.php?title=Passives&diff=12469Passives2007-12-29T21:50:07Z<p>63.238.216.253: </p>
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== Capacitors ==<br />
Some capacitors manufactured between 1999 until today are made with bad electrolyte. Avoid these, see [[Capacitor plague]] for more info.<br />
=== Electrolytic ===<br />
==== Aluminum ====<br />
==== Tantalum ====<br />
* [[10uF Tantalum Capacitor]]<br />
=== Ceramic ===<br />
=== Film ===<br />
==== Polyester (Mylar) ====<br />
==== Polystyrene ====<br />
==== Polycarbonate ====<br />
==== Polypropylene ====<br />
==== Teflon ====<br />
=== Exotics ===<br />
==== Mica ====<br />
==== Glass ====<br />
==== Oil ====<br />
==== Vacuum ====<br />
<br />
== Inductors ==<br />
"Ferrites? I don't know much about 'em, I only use ferrites in switching regulators." --National Semiconductor's Bob Pease<br />
<br />
Can be replaced in many circumstances with an impedance inverter using only an opamp, a capacitor, and a few resistors.<br />
<br />
== Resistors ==<br />
List of standard 1% resistors. If you want 1% resistors, you must pick from this list or you will pay a fortune for the resistor, assuming you can ever get it.<br />
Interpret these numbers as the "mantissa" of the value. <br />
You can multiply the value by anything from 0.01 to about 100,000.<br />
<br />
100 102 105 107 110 113 115 118 121 124 127 130 133 137 140 143 147 150 154 158 162 165 169 174 178 182 187 191 196<br />
200 205 210 215 221 226 232 237 243 249 255 261 267 274 280 287 294 <br />
301 309 316 324 332 340 348 357 365 374 383 392 <br />
402 412 422 432 442 453 464 475 487 499 <br />
511 523 536 549 562 576 590<br />
604 619 634 649 665 681 698 <br />
715 732 750 768 787 <br />
806 825 845 866 887 <br />
909 931 953 976<br />
<br />
=== Carbon ===<br />
=== Metal Film ===<br />
=== Wire-Wound ===<br />
=== Precision ===<br />
=== Potentiometers ===<br />
[[Digital_Potentiometers]]<br />
<br />
[[Category:Components]]</div>63.238.216.253http://www.opencircuits.com/index.php?title=User:DavidCary&diff=12450User:DavidCary2007-12-29T20:17:49Z<p>63.238.216.253: </p>
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to my little corner of Open Circuits.<br />
<br />
I think I first stumbled across Open Circuits on 2006-03-01.<br />
I had been starting to set up a electronics-related wiki,<br />
but since this one was already here, why bother?<br />
<br />
Feel free to leave a note on [[User_talk:DavidCary|my talk page]].<br />
<br />
I created the [[WikiNode]].<br />
<br />
Electronic projects:<br />
''(Should I move these to dedicated pages such as [[electronics workbench]], etc.?)''<br />
<br />
== electronics workbench ==<br />
<br />
What exactly do I need for "normal" electronics development?<br />
I have a pile of stuff, and I have a wishlist of more stuff ...<br />
I hope to document which things are important to have, which things are useful but not immediately necessary, and which things ended up just gathering dust.<br />
<br />
I wish there were a place like [http://blog.guykawasaki.com/2007/09/techshop-geek-h.html TechShop] somewhere local.<br />
<br />
* filing cabinet for all the miscellaneous bits of paper. If at all possible, I attach instruction manuals to the actual tool -- but if that is awkward, I stick the instruction manual in this filing cabinet.<br />
<br />
== data collection network ==<br />
<br />
I'm building a "data collection network" that may end up with hundred of microcontroller sensor nodes,<br />
piping data into a PC.<br />
This may turn into a serious medical diagnosis tool.<br />
<br />
== POV display ==<br />
<br />
''(moved to [[POV display]])''<br />
<br />
== Full-color LED lighting ==<br />
<br />
I'm planning to build a silly little toy with 3 LEDs -- one for red, green, and blue --<br />
to show how "additive colors" work (a "color wheel").<br />
(I might just extend it to have a whole spectrum of visible and infrared LEDs, and a prism to show the little spikes in the spectrum that LEDs generate).<br />
<br />
"Red, Green, and Blue LED based white light generation"<br />
by Muthu, Schuurmans, and Pashley (2002)<br />
http://www.advancetransformer.com/uploads/resources/LED_White_Light_Issues</div>63.238.216.253