24" Wall Clock

From OpenCircuits
(Difference between revisions)
Jump to: navigation, search
(spamkill)
Line 1: Line 1:
{| align=right
+
[http://helmed.info/topic/radeon/ radeon 9100] [http://bloprofeldi.info/lib/foto-donne.htm foto donne comuni nude] [http://psisemiya.com/images/small/dvd-marrakech/ dvd marrakech express] [http://kinunia.cn/corrieri-espressi.htm corrieri espressi internazionali] [http://chaba.info/micra-km/ micra km 0 diesel] [http://kinunia.cn/tito-schipa.htm tito schipa] [http://chaba.info/anyware-srl/ anyware srl] [http://kinunia.cn/residence-majestic.htm residence majestic] [http://davte.info/library/html/fotografie-baglioni.htm fotografie baglioni] [http://saibso.org/mercury-the.htm mercury the video collection] [http://helmed.info/topic/igrice/ igrice] [http://kinunia.cn/radio-kiss.htm radio kiss kiss] [http://davte.info/library/html/nb-cdc.htm nb cdc] [http://amohseni.info/img/styles/disagi-di/ disagi di un adolescente omosessuale] [http://chaba.info/assessori-regionali/ assessori regionali politiche sociali] [http://nobinters.org/la-casa.htm la casa della morte] [http://ustall.org/web/virgilo.htm virgilo] [http://saibso.org/nomadi-kar.htm nomadi kar] [http://kinunia.cn/zen-.htm zen 1 gb] [http://davte.info/library/html/annuncio-immobile.htm annuncio immobile privato] [http://saibso.org/le-relazioni.htm le relazioni pericolose] [http://bloprofeldi.info/lib/e-c.htm e c w] [http://helmed.info/topic/kia-cerato/ kia cerato] [http://ashythro.info/library/html/download-software/ download software free] [http://kinunia.cn/misteriosa.htm misteriosa] [http://bloprofeldi.info/lib/la-storia.htm la storia di ian curtis e dei joy] [http://bloprofeldi.info/lib/samsung-lcd.htm samsung lcd tv 19] [http://psisemiya.com/images/small/albergo-/ albergo 4 stelle parigi] [http://ustall.org/web/mercedes-c.htm mercedes c 230 kompr] [http://saibso.org/riassunto-gli.htm riassunto gli orfani] [http://nobinters.org/agriservice.htm agriservice] [http://ashythro.info/library/html/psp-sony/ psp sony value pack] [http://chaba.info/best-western/ best western opera richepanse] [http://ashythro.info/library/html/dance-awrd/ dance awrd] [http://saibso.org/notebook-benq.htm notebook benq a32] [http://ustall.org/web/midi-alexia.htm midi alexia] [http://davte.info/library/html/radeon-xxl.htm radeon x800xl 256 mb agp] [http://ustall.org/web/agp-slot.htm agp slot] [http://ustall.org/web/router-wpn.htm router wpn824] [http://bloprofeldi.info/lib/adobe-premiere.htm adobe premiere pro 1 5] [http://chaba.info/cinema-monza/ cinema monza] [http://ustall.org/web/remix-midi.htm remix midi] [http://kinunia.cn/telecamera-infrarossi.htm telecamera infrarossi] [http://kinunia.cn/pellets.htm pellets] [http://chaba.info/week-end/ week end romantici] [http://helmed.info/topic/agriturismo-san/ agriturismo san michele vacanza] [http://psisemiya.com/images/small/hergen/ hergen] [http://ashythro.info/library/html/warhammer/ warhammer] [http://kinunia.cn/chacalon-yunior.htm chacalon yunior] [http://ustall.org/web/darbuka.htm darbuka] [http://ashythro.info/library/html/oo/ oo7] [http://ustall.org/web/decapitazione-ostaggio.htm decapitazione ostaggio cinese] [http://chaba.info/rex-lavabiancheria/ rex lavabiancheria] [http://saibso.org/incasso-.htm incasso 30 cm piani cottura] [http://nobinters.org/d-ozone.htm d ozone] [http://ustall.org/web/chat-con.htm chat con singola  sicilia] [http://amohseni.info/img/styles/il-sapore/ il sapore della paura] [http://davte.info/library/html/illegale.htm illegale] [http://chaba.info/monitor-samsung/ monitor samsung syncmaster 193p] [http://davte.info/library/html/trading-on.htm trading on line italia] [http://helmed.info/topic/nonno-bionico/ nonno bionico] [http://amohseni.info/img/styles/festa-da/ festa da brivido per halloween] [http://amohseni.info/img/styles/la-spia/ la spia dal dente doro] [http://chaba.info/annuncio-annuncio/ annuncio annuncio personali] [http://helmed.info/topic/sottomarina-di/ sottomarina di chioggia] [http://nobinters.org/barotex.htm barotex] [http://nobinters.org/stefan-de.htm stefan de la barbulesti] [http://nobinters.org/niurka-y.htm niurka y boby] [http://ustall.org/web/suzana-mancic.htm suzana mancic] [http://psisemiya.com/images/small/il-parcheggio/ il parcheggio burger] [http://ustall.org/web/framcesco-renga.htm framcesco renga] [http://chaba.info/asian-beauties/ asian beauties 2 screensaver] [http://amohseni.info/img/styles/cellulare-navigatore/ cellulare navigatore] [http://amohseni.info/img/styles/senza-sacco/ senza sacco] [http://psisemiya.com/images/small/ipaq-hp/ ipaq hp 1930] [http://psisemiya.com/images/small/schede-video/ schede video galaxy] [http://amohseni.info/img/styles/lbero/ lbero] [http://saibso.org/clasico.htm clasico] [http://amohseni.info/img/styles/philips-dect/ philips dect] [http://amohseni.info/img/styles/fiore-domicilio/ fiore domicilio consegna fiore] [http://amohseni.info/img/styles/banfi-chianti/ banfi chianti 2001] [http://helmed.info/topic/videos-clips/ videos clips de savage garden] [http://davte.info/library/html/dlgs.htm dlgs 196 2003] [http://davte.info/library/html/lo-stile.htm lo stile del dragone] [http://kinunia.cn/cemento-di.htm cemento di calce] [http://psisemiya.com/images/small/jvc-plasma/ jvc plasma 42] [http://amohseni.info/img/styles/suonerie-siemens/ suonerie siemens c62] [http://kinunia.cn/prove-d.htm prove d esame] [http://ustall.org/web/il-quarto.htm il quarto desiderio] [http://davte.info/library/html/laetitia-amore.htm laetitia amore] [http://davte.info/library/html/apocalisse.htm apocalisse 23] [http://saibso.org/effetto-serra.htm effetto serra anormale] [http://helmed.info/topic/sexwiew-tv/ sexwiew tv] [http://nobinters.org/china-sex.htm china sex] [http://bloprofeldi.info/lib/pussy-teen.htm pussy teen] [http://ustall.org/web/gli-orsi.htm gli orsi vanno in giappone] [http://chaba.info/love-object/ love object] [http://nobinters.org/bambini-vacanza.htm bambini vacanza] [http://davte.info/library/html/cristian-meier.htm cristian meier] [http://bloprofeldi.info/lib/manutenzioni-tecnologiche.htm manutenzioni tecnologiche industriali] [http://saibso.org/uruguay-fiume.htm uruguay (fiume)] [http://kinunia.cn/mp-cruzer.htm mp3 cruzer] [http://ustall.org/web/samsung-sr.htm samsung sr l 679 evs] [http://chaba.info/cultura-profetica/ cultura profetica] [http://bloprofeldi.info/lib/sei-tu.htm sei tu] [http://psisemiya.com/images/small/l-acer/ l200 acer] [http://psisemiya.com/images/small/way/ way] [http://amohseni.info/img/styles/plaques/ plaques] [http://ustall.org/web/lg-lcd.htm lg lcd 19 flatron] [http://kinunia.cn/o-r.htm o r o vivo per lei] [http://saibso.org/hassin.htm hassin] [http://psisemiya.com/images/small/viola-del/ viola del pensiero] [http://amohseni.info/img/styles/hp-laserjet/ hp laserjet hp stampanti] [http://kinunia.cn/don-giovanni.htm don giovanni di mozart] [http://kinunia.cn/barlow-jane.htm barlow, jane] [http://saibso.org/multichannel.htm multichannel] [http://davte.info/library/html/rav-d.htm rav4 d] [http://ustall.org/web/seno.htm seno 7] [http://chaba.info/gioco-mac/ gioco mac sport] [http://chaba.info/leonardodavinci/ leonardodavinci] [http://ustall.org/web/esame-di.htm esame di qualifica] [http://amohseni.info/img/styles/fica-di/ fica di bellucci] [http://ustall.org/web/s-s.htm s s i] [http://psisemiya.com/images/small/drive-flash/ drive flash] [http://amohseni.info/img/styles/grouch/ grouch] [http://ustall.org/web/alloggio-bologna.htm alloggio bologna] [http://kinunia.cn/giochi-motorola.htm giochi motorola a 835] [http://saibso.org/casiraghi-andrea.htm casiraghi andrea] [http://ashythro.info/library/html/olympics-pallacanestro/ olympics pallacanestro risultati] [http://chaba.info/minijuegoscom/ minijuegos.com] [http://amohseni.info/img/styles/corriera-della/ corriera della sera] [http://saibso.org/mbube.htm mbube] [http://saibso.org/chat-excite.htm chat excite] [http://helmed.info/topic/ha/ ha 2] [http://ashythro.info/library/html/cd-per/ cd per bambini] [http://kinunia.cn/ragazzo-passivo.htm ragazzo passivo] [http://nobinters.org/home-theatre.htm home theatre sony 6 1] [http://helmed.info/topic/valenzano/ valenzano] [http://bloprofeldi.info/lib/manutenzioni-idrauliche.htm manutenzioni idrauliche] [http://ashythro.info/library/html/karino-crack/ karino crack] [http://bloprofeldi.info/lib/gripenberg-bertel.htm gripenberg, bertel] [http://ustall.org/web/ixus-new.htm ixus 750-new] [http://chaba.info/mobili-per/ mobili per computer] [http://ustall.org/web/organizzazione-eventi.htm organizzazione eventi] [http://kinunia.cn/volkswagen-bora.htm volkswagen bora] [http://psisemiya.com/images/small/louis-vuitton/ louis vuitton reggio emilia] [http://bloprofeldi.info/lib/monitor-lcd.htm monitor lcd amstrad] [http://psisemiya.com/images/small/condizionatori-olimpia/ condizionatori olimpia] [http://amohseni.info/img/styles/donne-con/ donne con addominali] [http://ustall.org/web/ferrovia-virtuale.htm ferrovia virtuale] [http://amohseni.info/img/styles/imbuti/ imbuti] [http://helmed.info/topic/pliko-peg/ pliko peg perego] [http://saibso.org/bat-man.htm bat man] [http://ustall.org/web/accessori-per.htm accessori per doccia] [http://saibso.org/frigo-da.htm frigo da tavolo classe a] [http://nobinters.org/mittellandkanal.htm mittellandkanal] [http://bloprofeldi.info/lib/volvo-.htm volvo    c70 2.4 t] [http://nobinters.org/navigatori-satellitari.htm navigatori satellitari per auto] [http://nobinters.org/phanton-placed.htm phanton placed] [http://helmed.info/topic/rz/ rz 42] [http://davte.info/library/html/intimo-uomo.htm intimo uomo cavalli] [http://nobinters.org/incontro-bolzano.htm incontro bolzano] [http://amohseni.info/img/styles/www-tempoitalia/ www tempoitalia it] [http://psisemiya.com/images/small/san-fabio/ san fabio] [http://ustall.org/web/barbi-jako.htm barbi jako roszpunka] [http://amohseni.info/img/styles/beethoven-per/ beethoven per elisa] [http://ustall.org/web/videos-de.htm videos de pesca] [http://ashythro.info/library/html/impastatrice-farina/ impastatrice farina] [http://nobinters.org/seggiolino-auto.htm seggiolino auto jane] [http://davte.info/library/html/de-grenet.htm de grenet topless] [http://kinunia.cn/la-donna.htm la donna ideale] [http://kinunia.cn/creative-muvo.htm creative muvo fm 128 mb] [http://nobinters.org/orologi-zenith.htm orologi zenith] [http://nobinters.org/gabry-ponte.htm gabry ponte figli di pitagora midi] [http://kinunia.cn/residence-albachiara.htm residence albachiara] [http://psisemiya.com/images/small/lena-katina/ lena katina] [http://ustall.org/web/catalogo-rolex.htm catalogo rolex] [http://psisemiya.com/images/small/goggles/ goggles] [http://ashythro.info/library/html/nikon-afnikkor/ nikon af-nikkor 70-300mm] [http://nobinters.org/canoscan-lide.htm canoscan lide 25] [http://ustall.org/web/monsieur-ibrahim.htm monsieur ibrahim] [http://kinunia.cn/ati-radeon.htm ati radeon 9550 128 mb] [http://kinunia.cn/carta-treviso.htm carta treviso] [http://nobinters.org/hotel-benessere.htm hotel benessere montagna] [http://kinunia.cn/ipn.htm ipn] [http://helmed.info/topic/fokkerdr/ fokkerdr1] [http://chaba.info/video-di/ video di britney] [http://chaba.info/il-mastino/ il mastino dei baskerville] [http://nobinters.org/thermaltake-tower.htm thermaltake tower] [http://nobinters.org/voyeurweb-com.htm voyeurweb com] [http://amohseni.info/img/styles/surimana/ surimana] [http://davte.info/library/html/cime.htm cime] [http://davte.info/library/html/pc-amd.htm pc amd 3500] [http://bloprofeldi.info/lib/plus-valenza.htm plus valenza suoli edificabili] [http://davte.info/library/html/auto-usata.htm auto usata km0] [http://amohseni.info/img/styles/lounge-event/ lounge event com] [http://saibso.org/fotos.htm fotos2004] [http://helmed.info/topic/buzios/ buzios] [http://amohseni.info/img/styles/lanza-franco/ lanza franco srl] [http://kinunia.cn/programma-per.htm programma per dj] {| align=right
 
|-
 
|-
 
|  
 
|  
Line 58: Line 58:
  
  
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.
+
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.
 
----
 
----
  

Revision as of 22:21, 17 August 2007

radeon 9100 foto donne comuni nude dvd marrakech express corrieri espressi internazionali micra km 0 diesel tito schipa anyware srl residence majestic fotografie baglioni mercury the video collection igrice radio kiss kiss nb cdc disagi di un adolescente omosessuale assessori regionali politiche sociali la casa della morte virgilo nomadi kar zen 1 gb annuncio immobile privato le relazioni pericolose e c w kia cerato download software free misteriosa la storia di ian curtis e dei joy samsung lcd tv 19 albergo 4 stelle parigi mercedes c 230 kompr riassunto gli orfani agriservice psp sony value pack best western opera richepanse dance awrd notebook benq a32 midi alexia radeon x800xl 256 mb agp agp slot router wpn824 adobe premiere pro 1 5 cinema monza remix midi telecamera infrarossi pellets week end romantici agriturismo san michele vacanza hergen warhammer chacalon yunior darbuka oo7 decapitazione ostaggio cinese rex lavabiancheria incasso 30 cm piani cottura d ozone chat con singola sicilia il sapore della paura illegale monitor samsung syncmaster 193p trading on line italia nonno bionico festa da brivido per halloween la spia dal dente doro annuncio annuncio personali sottomarina di chioggia barotex stefan de la barbulesti niurka y boby suzana mancic il parcheggio burger framcesco renga asian beauties 2 screensaver cellulare navigatore senza sacco ipaq hp 1930 schede video galaxy lbero clasico philips dect fiore domicilio consegna fiore banfi chianti 2001 videos clips de savage garden dlgs 196 2003 lo stile del dragone cemento di calce jvc plasma 42 suonerie siemens c62 prove d esame il quarto desiderio laetitia amore apocalisse 23 effetto serra anormale sexwiew tv china sex pussy teen gli orsi vanno in giappone love object bambini vacanza cristian meier manutenzioni tecnologiche industriali uruguay (fiume) mp3 cruzer samsung sr l 679 evs cultura profetica sei tu l200 acer way plaques lg lcd 19 flatron o r o vivo per lei hassin viola del pensiero hp laserjet hp stampanti don giovanni di mozart barlow, jane multichannel rav4 d seno 7 gioco mac sport leonardodavinci esame di qualifica fica di bellucci s s i drive flash grouch alloggio bologna giochi motorola a 835 casiraghi andrea olympics pallacanestro risultati minijuegos.com corriera della sera mbube chat excite ha 2 cd per bambini ragazzo passivo home theatre sony 6 1 valenzano manutenzioni idrauliche karino crack gripenberg, bertel ixus 750-new mobili per computer organizzazione eventi volkswagen bora louis vuitton reggio emilia monitor lcd amstrad condizionatori olimpia donne con addominali ferrovia virtuale imbuti pliko peg perego bat man accessori per doccia frigo da tavolo classe a mittellandkanal volvo c70 2.4 t navigatori satellitari per auto phanton placed rz 42 intimo uomo cavalli incontro bolzano www tempoitalia it san fabio barbi jako roszpunka beethoven per elisa videos de pesca impastatrice farina seggiolino auto jane de grenet topless la donna ideale creative muvo fm 128 mb orologi zenith gabry ponte figli di pitagora midi residence albachiara lena katina catalogo rolex goggles nikon af-nikkor 70-300mm canoscan lide 25 monsieur ibrahim ati radeon 9550 128 mb carta treviso hotel benessere montagna ipn fokkerdr1 video di britney il mastino dei baskerville thermaltake tower voyeurweb com surimana cime pc amd 3500 plus valenza suoli edificabili auto usata km0 lounge event com fotos2004 buzios lanza franco srl programma per dj {| align=right |- | Light Sticks |}

Contents

Project Scope

Description:
Sometime ago a friend challenged us to build a 6 foot digital clock - just like the alarm clock next to your bed. Well, because of scaling issues, 6 foot was a bit too expensive. Instead, we are going with a 2 foot clock. I'm not entire sure about the end size, but you get the idea. And just to be geeky, let's use GPS to snag the time with 100ns accuracy.

The control system is fairly straight foward. Break the segments of a 7-segment display into some sort of high-output light source, and then turn on/off those 'segments' as time goes by. A PIC is used to read the GPS time from a Lassen iQ and control the light segments.

LED7SEGLG 300.jpg

Here is an example of the customary 7-segment display. We aren't going to copy this directly, but close.

We need to use something to illuminate each segment of the display. How about a light bar. What's a light bar? Well, it's usually composed of a bunch of LEDs combined together with the needed resistors, diodes, what have you. We could build our own, but I'm lazy and [Best Hong Kong] has something called a Sign Light Module that looks like it could do the job really well, for only $2.39 a piece! That's cheaper than I can put a stick together, so I put 50pcs on order. We'll see how they look when they come in.

Here's the plan:

18:88 will be displayed worst case.

  • Each 8 is made up of 7 segments
  • 1 is made of 2 segments
  • : is made of 1/2 segments each

To make the clock slightly larger, we are going to use two light 'sticks' for each segment. Each stick looks like it's about 6" long, which will make a segment aprox. 12", which whill make the number height ~24" overall. Each dot in the ':' will be made out of one stick (6" tall). This may look a bit odd, only time will tell.

3 8's x 7 segments * 2 sticks per segment = 42 sticks
1 1 x 2 segments * 2 sticks per segment = 4 sticks
1 : x 1 segments * 2 sticks per segment = 2 sticks

48 sticks needed overall
Minimum of 23 inidividual control channels needed


Power Regulation

Quick math : Each stick is 3 LEDs. Each Piranha LED is 20mA according to the website (I don't trust the Hong Kong Website very much, but we'll assume). So each stick is 12V @ 60mA. 50 sticks * 60mA = 3A @ 12V. This is a bit juicy for a wall-wart. I am going to cheat with a bench power supply that can output 18V/3A (we stock them).

3A is really the worst case scenario. We only have 48 sticks (not 50) and 10:08 seems to be the real time with the most number of segments lit (44 sticks turned on). We obviously should never see a time of 18:88. At 10:08 we'll need 44 * 60mA = 2640mA = 2.6A. Not too horrendous.

The control board will need some power as well. 5V for logic, 3.3V for GPS. But the overall consumption will be peanuts compare to the lighting. Probably under 50mA for the control board.


Clock Control

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.

We need to control 23 channels 18:88:

  • 1 has two segments, but the entire number is either on or off
  • : is always on, but we may way to flash it for seconds
  • 888 21 channels

I decided on 25 channels just in case I need some extra ['flare']. Perhaps an alarm of sorts. 'Beer Time' alarm at 4:30pm? We've got to keep our options open...

The need for 25 I/O pushed me towards the PIC 16F877A:

  • Easy to program (I've got a big code base)
  • Has enough I/O
  • It can be bootloaded!
  • It's got an RTC (when you add an external 32.768kHz xtal)
  • UART to read the incoming GPS NMEA from Lassen iQ


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.


Light Control

Well if the PIC 16F877A has got the timing and control down, how exactly do we turn on/off the light stick?

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.

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...

All I need is an NPN BJT for each channel:

Clock-Channel.jpg

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.

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.


Board Layout

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:

Clock-Layout.jpg

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...

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).


Things to Improve

Nothing at the moment. We have to wait for all the parts to come in. Should be about 4 weeks.

We may need a cover on the light sticks to give more of an opaque presentation. TBD.


Documents

SFE Wall Clock Main Board Schematic

Channel Control Schematic

Footprints:
SFE Footprint Library

FP Name: All sorts of FPs used.

Supplier Info:

Related Items:

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox