Post by thread:[PICLIST] %5BPIC%5D%3A

Can someone please tell me a way to connect eight momentary action pushbuttons to a PIC so that each button will light a -------------------- It depends on which PIC you want to use and what else is connected to it. For example, doing this on a 12C508 is possible but would involve external circuitry. An F84 or other mulitport PIC could do this on it's own. Although an F84 or one with a similar number of i/o pins would perhaps be configured to use the most number of i/o pins that would reliaby detect the first pushbutton press, and then maybe use either the same i/o as LED drivers, or alternatively multiplex the LEDs with an external shift register. If you can specify a particular PIC, then it will be easier to make suggestions Apologies for the drift into HTML if you can see it, the original post must have it turned on. My mail program is set to plain text -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

> Can someone please tell me a way to connect > eight momentary action pushbuttons to a PIC so > that each button will light a corresponding LED, > while locking out the other seven switches and their > respective LEDs? This will be used as the basis of a > kind of 'quiz-game adjudicator' to detect the > first button press only Hi, I would use a 16F84 and set PORTB as all inputs and wait for a button in a short loop. As there is a possibility of a tie (more than one button in 10uSecs), you would need to arbitrate and a random pick would probably do OK. After a button is detected, I would then change PORTB winner to an output and display the winning LED. There would be some hardware considerations to stop the buttons from operating the LEDs. Then a reset button, using PORTA would start over again. Jeff Johnson http://home.dialix.com/~u2263/index.htm __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/ -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

At 02:37 PM 4/15/01 -0700, you wrote: >Here is what I suggest: > >use 8 output pins >one input pin >pull down the input with a 10k resistor >every output pin is connected to the input pin >thru a switch >the switchs also have an led and resistor >connected to ground on the side opposite from >the output > >using 1/8 duty cycle, >set each output pin in turn to 5v >at this time also set the other outputs to inputs > if someone presses a switch, 5v is detected >at the input, so the code should pause until the 5v is gone. >the led will light on the switch press. You can use one more output to keep the lights from all lighting while it is scanning (keep it high (or open) until a hit is detected- it goes to the LED common). Also, when the first press is detected multiple leds may show until some of the switches are released. You'd need diodes on each switch to get around that. I'd suggest an 18-pin PIC16F627 with internal 4MHz clock for minimum parts count. Best regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" speffKILLspaminterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body

> Can someone please tell me a way to connect eight momentary action pushbuttons to a PIC so that each button will light a corresponding LED, while locking out the other seven switches and their respective LEDs? This will be used as the basis of a kind of 'quiz-game adjudicator', to detect the first button press only. Why a PIC? Take a power supply with a series resistor. Feed the 2 lines (power and ground) to each person. At each person, use a thyristor and a LED in series, and a zener + pushbutton + resistor to fire the thyristor. When one thyristor has fired, the voltage will lower so a second one won't fire. The quizzmaster can reset by removing or shorting the power. Very simple, reliable and expandable. BTW I seem to remember that this has been discussed to death some time ago? Wouter -- http://www.piclist.com hint: To leave the PICList EraseMEpiclist-unsubscribe-requestspam_OUTTakeThisOuTmitvma.mit.edu

----- Original Message ----- From: "Spehro Pefhany" <speffspam_OUTINTERLOG.COM> To: <@spam@PICLISTKILLspamMITVMA.MIT.EDU> Sent: Sunday, April 15, 2001 7:36 PM Subject: Re: [PIC] %5BPIC%5D%3A {Quote hidden}> At 02:37 PM 4/15/01 -0700, you wrote: > >Here is what I suggest: > > > >use 8 output pins > >one input pin > >pull down the input with a 10k resistor > >every output pin is connected to the input pin > >thru a switch > >the switchs also have an led and resistor > >connected to ground on the side opposite from > >the output > > > >using 1/8 duty cycle, > >set each output pin in turn to 5v > >at this time also set the other outputs to inputs > > if someone presses a switch, 5v is detected > >at the input, so the code should pause until the 5v is gone. > >the led will light on the switch press. > > You can use one more output to keep the lights from > all lighting while it is scanning (keep it high (or open) > until a hit is detected- it goes to the LED common). > > Also, when the first press is detected multiple leds may > show until some of the switches are released. You'd need > diodes on each switch to get around that. I'd suggest an > 18-pin PIC16F627 with internal 4MHz clock for minimum parts > count. > > Best regards, > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- = > Spehro Pefhany --"it's the network..." "The Journey is the reward" > KILLspamspeffKILLspaminterlog.com Info for manufacturers: http://www.trexon.com > Embedded software/hardware/analog Info for designers: http://www.speff.com > Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- = > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body > > > you are right. 8 diodes are needed to prevent all the leds from lighting. 16 ports cuts the parts list to 8 switches and 8 leds (the led outputs can be duty-cycled ) -thanks -Craig -- http://www.piclist.com hint: To leave the PICList spamBeGonepiclist-unsubscribe-requestspamBeGonemitvma.mit.edu

wouter van ooijen & floortje hanneman wrote: > > > Can someone please tell me a way to connect eight momentary action > pushbuttons to a PIC so that each button will light a corresponding LED, > while locking out the other seven switches and their respective LEDs? This > will be used as the basis of a kind of 'quiz-game adjudicator', to detect > the first button press only. > > Why a PIC? Take a power supply with a series resistor. Feed the 2 lines > (power and ground) to each person. At each person, use a thyristor and a LED > in series, and a zener + pushbutton + resistor to fire the thyristor. When > one thyristor has fired, the voltage will lower so a second one won't fire. > The quizzmaster can reset by removing or shorting the power. Very simple, > reliable and expandable. Been there, done that. Wish I had used a PIC... -- Rich > > BTW I seem to remember that this has been discussed to death some time ago? > > Wouter > > -- > http://www.piclist.com hint: To leave the PICList > TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

Dan: Normally I would have gone for the minimum number of parts. It seemed that for mechanical and other reasons that more parts would actually be easier to build and maintain than the PIC version. Oops. This was a one that I did not want to support at zero income for ever and ever. I gave them a schematic and hoped that they got the hint :-) -- Rich Dan Michaels wrote: {Quote hidden}> > At 12:51 PM 4/16/01 -0700, you wrote: > >On Mon, 16 Apr 2001 09:40:58 -0600 Richard Ottosen <RemoveMErottosenTakeThisOuTspamIDCOMM.COM> > >writes: > >> > >> Been there, done that. Wish I had used a PIC... > >> > >> > > > > Something like "The ideal design has zero parts..." > > > >Harold > > > > I'm with Harold - why use many discrete parts when you can design > with just a couple? For philosophical issues, see Mchp stuff on > "Mechatronics": > > http://www.microchip.com/mechatronics/ > > -- > http://www.piclist.com hint: To leave the PICList > EraseMEpiclist-unsubscribe-requestspamspamBeGonemitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestKILLspammitvma.mit.edu

I should have explained why I should have used a PIC. Even though I had most of the parts to do the SCR version of the circuit, it turned out to be a lot trickier to get it to work than I expected. Lots of resistors, caps, diodes and other stuff. When I started I felt that the unit would be more maintainable without a micro in it. I built the unit and took it to a 6502 Group ( http://6502group.org/ ) meeting to do a geeks version of Jeopardy. It worked great except for the lack of a buzzer to indicate that someone had pressed a button. Our group is not lacking in shyness so it was no problem to split up the tasks with on member reading the questions and another acting as a buzzer and operating the reset switch. Unfortunately, the unit was built for a much more serious (competitive) environment. With the PIC, the buzzer would have been easy to add and the circuit could have had a timeout to do an automatic reset. -- Rich Harold M Hallikainen wrote: {Quote hidden}> > On Mon, 16 Apr 2001 09:40:58 -0600 Richard Ottosen <rottosenSTOPspamspam_OUTIDCOMM.COM> > writes: > > > > Been there, done that. Wish I had used a PIC... > > > > > > Something like "The ideal design has zero parts..." > > Harold > > FCC Rules Online at http://hallikainen.com/FccRules > Lighting control for theatre and television at http://www.dovesystems.com > > ________________________________________________________________ > GET INTERNET ACCESS FROM JUNO! > Juno offers FREE or PREMIUM Internet access for less! > Join Juno today! For your FREE software, visit: > dl.http://www.juno.com/get/tagj. > > -- > http://www.piclist.com hint: To leave the PICList > spamBeGonepiclist-unsubscribe-requestSTOPspamEraseMEmitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList KILLspampiclist-unsubscribe-requestspamBeGonemitvma.mit.edu

{Quote hidden}> > Hello to you all, > > > > My name is Bertus Living in Netherlands, retired > and > > > also a heavy hamradio user. > > > > Some time ago getting a idea to make speedtrap > > warning device with help using normal GPS > > receivers. > > Myself totaly no software coder or what so ever > and > > only have this idea in my mind. > > > > Search for someone who is able to help advice to > > make/develop a small pice of firmware inside a > > PIC like 16Fxx or any other. > > I also having some GPS tools to help out any > > developments or simulation without need of > realtime > > hardware gps. > > To program pic i using LUDIPOP programmer. > > When possible someone help with hardware diagram > > around it to let this device run. > > > > When you like more details about the idea i > having, > > i wil be happy to reply. > > Hope you are willing to help me out, please ? > > > > Kind regards, > > Bertus. > > > ===== > ------------- http://clik.to/aprsmobiel > ---------------- > TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en > ZELFBOUW. > >>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN > ?<<<<<<<<<<<< > AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: > http://www.geocities.com/aprsmobiel/PRIJS.HTM > Please also visit my Kreidler and Zuendapp pagina > at: > -------------- http://clik.to/zundapp > ------------------ > > __________________________________________________ > Do You Yahoo!? > Find a job, post your resume. > http://careers.yahoo.com > ===== ------------- http://clik.to/aprsmobiel ---------------- TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en ZELFBOUW. >>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN ?<<<<<<<<<<<< AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: http://www.geocities.com/aprsmobiel/PRIJS.HTM Please also visit my Kreidler and Zuendapp pagina at: -------------- http://clik.to/zundapp ------------------ __________________________________________________ Do You Yahoo!? Find a job, post your resume. http://careers.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

What is it that you plan on doing with the GPS? How is the GPS supposed to warn you of a speedtrap? -Adam APRS Mobiel wrote: {Quote hidden}>>>Hello to you all, >>> >>>My name is Bertus Living in Netherlands, retired >>> >>and >> >>>also a heavy hamradio user. >>> >>>Some time ago getting a idea to make speedtrap >>>warning device with help using normal GPS >>>receivers. >>>Myself totaly no software coder or what so ever >>> >>and >> >>>only have this idea in my mind. >>> >>>Search for someone who is able to help advice to >>>make/develop a small pice of firmware inside a >>>PIC like 16Fxx or any other. >>>I also having some GPS tools to help out any >>>developments or simulation without need of >>> >>realtime >> >>>hardware gps. >>>To program pic i using LUDIPOP programmer. >>>When possible someone help with hardware diagram >>>around it to let this device run. >>> >>>When you like more details about the idea i >>> >>having, >> >>>i wil be happy to reply. >>>Hope you are willing to help me out, please ? >>> >>>Kind regards, >>>Bertus. >>> >> >>===== >>------------- http://clik.to/aprsmobiel >>---------------- >>TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en >>ZELFBOUW. >> >>>>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN >>>>>>>>>>> >>?<<<<<<<<<<<< >> AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: >> http://www.geocities.com/aprsmobiel/PRIJS.HTM >> Please also visit my Kreidler and Zuendapp pagina >>at: >>-------------- http://clik.to/zundapp >>------------------ >> >>__________________________________________________ >>Do You Yahoo!? >>Find a job, post your resume. >>http://careers.yahoo.com >> > > >===== >------------- http://clik.to/aprsmobiel ---------------- >TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en ZELFBOUW. > >>>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN ?<<<<<<<<<<<< >>>>>>>>>> > AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: > http://www.geocities.com/aprsmobiel/PRIJS.HTM > Please also visit my Kreidler and Zuendapp pagina at: >-------------- http://clik.to/zundapp ------------------ > >__________________________________________________ >Do You Yahoo!? >Find a job, post your resume. >http://careers.yahoo.com > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

The system uses a database of known speed trap locations and alerts you when the GPS position nears one of them. There are one or 2 commercial systems availiable here in the UK, but I don't know accurate their data is. Useless for mobile traps though.. {Quote hidden}> > What is it that you plan on doing with the GPS? How is the GPS supposed > to warn you of a speedtrap? > > -Adam > > APRS Mobiel wrote: > > >>>Hello to you all, > >>> > >>>My name is Bertus Living in Netherlands, retired > >>> > >>and > >> > >>>also a heavy hamradio user. > >>> > >>>Some time ago getting a idea to make speedtrap > >>>warning device with help using normal GPS > >>>receivers. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

=%5BPIC%5D%3A THE IDEA OF: Speedtrap warning device using any GPS receiver. Hello to you all, My name is Bertus Living in Netherlands, retired and also a heavy hamradio user. Some time ago getting a idea to make speedtrap warning device with help using normal GPS receivers. Myself totaly no software coder or what so ever and only have this idea in my mind. Search for someone who is able to help advice to make/develop a small pice of firmware inside a PIC like 16Fxx or any other. I also having some GPS tools to help out any developments or simulation without need of realtime hardware gps. To program pic i using LUDIPOP programmer. When possible someone help with hardware diagram around it to let this device run. When you like more details about the idea i having, i wil be happy to reply. Hope you are willing to help me out, please ? Kind regards, Bertus. EraseMEaprsmobielEraseMEyahoo.com ===== ------------- http://clik.to/aprsmobiel ---------------- TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en ZELFBOUW. >>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN ?<<<<<<<<<<<< AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: http://www.geocities.com/aprsmobiel/PRIJS.HTM Please also visit my Kreidler and Zuendapp pagina at: -------------- http://clik.to/zundapp ------------------ __________________________________________________ Do You Yahoo!? Find a job, post your resume. http://careers.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> What is it that you plan on doing with the GPS? How is the GPS supposed > to warn you of a speedtrap? One method is to use GPS to derive speed across ground (taking account also for elevation) and ensure that your velocity vector never exceeds the local speed limit. You could also map speed limit boundaries to determine the appropriate change points. Generally intelligent application of a speedometer, brain and eyes works well enough already. It's a cheap solution (as most systems are already equipped with all the components) and it can provide an almost 100% success rate against speeding, let alone speeding tickets. From what I've heard it's FAR more successful at achieving a lack of speeding tickets than the results reported by people using RADAR / LIDAR detectors. RM :-) -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Dear Adam, Thanks for reply. The idea is using a PIC and extra RAM to store all known speedtrap GPS locations into RAM. (here in NL around 2000) When driving on the road toward the known location/GPS coordinates, the warning device sounds his alarm. Personaly think could be very simple pice of device with just 1 PIC, piezo and some LED blink. Bertus. --- "M. Adam Davis" <@spam@adampic@spam@spam_OUTUBASICS.COM> wrote: {Quote hidden}> What is it that you plan on doing with the GPS? How > is the GPS supposed > to warn you of a speedtrap? > -Adam > > APRS Mobiel wrote: > > >>>Hello to you all, > >>> > >>>My name is Bertus Living in Netherlands, retired > >>> > >>and > >> > >>>also a heavy hamradio user. > >>> > >>>Some time ago getting a idea to make speedtrap > >>>warning device with help using normal GPS > >>>receivers. > >>>Myself totaly no software coder or what so ever > >>> > >>and > >> > >>>only have this idea in my mind. > >>> > >>>Search for someone who is able to help advice to > >>>make/develop a small pice of firmware inside a > >>>PIC like 16Fxx or any other. > >>>I also having some GPS tools to help out any > >>>developments or simulation without need of > >>> > >>realtime > >> > >>>hardware gps. > >>>To program pic i using LUDIPOP programmer. > >>>When possible someone help with hardware diagram > >>>around it to let this device run. > >>> > >>>When you like more details about the idea i > >>> > >>having, > >> > >>>i wil be happy to reply. > >>>Hope you are willing to help me out, please ? > >>> > >>>Kind regards, > >>>Bertus. > >>> > >> > >>===== > >>------------- http://clik.to/aprsmobiel > >>---------------- > >>TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en > >>ZELFBOUW. > >> > >>>>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN > >>>>>>>>>>> > >>?<<<<<<<<<<<< > >> AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN > OP: > >> http://www.geocities.com/aprsmobiel/PRIJS.HTM > >> Please also visit my Kreidler and Zuendapp > pagina > >>at: > >>-------------- http://clik.to/zundapp > >>------------------ > >> > >>__________________________________________________ > >>Do You Yahoo!? > >>Find a job, post your resume. > >>http://careers.yahoo.com > >> > > > > > >===== > >------------- http://clik.to/aprsmobiel > ---------------- > >TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en > ZELFBOUW. > > > >>>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN > ?<<<<<<<<<<<< > >>>>>>>>>> > > AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: > > http://www.geocities.com/aprsmobiel/PRIJS.HTM > > Please also visit my Kreidler and Zuendapp pagina > at: > >-------------- http://clik.to/zundapp > ------------------ > > > >__________________________________________________ > >Do You Yahoo!? > >Find a job, post your resume. > >http://careers.yahoo.com > > > >-- > >http://www.piclist.com hint: PICList Posts must > start with ONE topic: > >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other > [BUY]:,[AD]: ->Ads > > > > > > > > > > > > -- > http://www.piclist.com hint: PICList Posts must > start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other > [BUY]:,[AD]: ->Ads > > ===== ------------- http://clik.to/aprsmobiel ---------------- TRACKERS, GPS ONTVANGERS, APRS TRANCEIVER en ZELFBOUW. >>>>>>>>>HEEFT U VRAGEN OF (BOUW)PROBLEMEN ?<<<<<<<<<<<< AMATEUR BOUWKITS, BESTELLEN EN PRIJZEN STAAN OP: http://www.geocities.com/aprsmobiel/PRIJS.HTM Please also visit my Kreidler and Zuendapp pagina at: -------------- http://clik.to/zundapp ------------------ __________________________________________________ Do You Yahoo!? Find a job, post your resume. http://careers.yahoo.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> In other words, what you're saying is "drive slow". What needs to be > realised here, without getting into an argument about who's right and > who's wrong, is that people will go over the speed limit - be it a > little or a lot. > > So, for those who want such a device, help them out for the sake of what > this PIClist is about, rather than preaching about what is deemed > appropriate motorist behaviour. Fair enough? OK. Many (most?) modern speedometers are electronically analog driven. Add a pot and a comparator to monitor this signal and you can tell when a given speed is exceeded. A suitable caution can be sounded. Add a PIC and you could have a unit which checks all common speed limits and sounds different distinctive tones once when each of the limits is exceeded by more than a certain amount for a certain period. This way the tome for eg 20 or 30 kph does not sound continuously when travelling at eg 50 kph. When the highest allowable legal speed is exceeded by more than a certain amount the appropriate tome could sound continuously or a and a speed reduction signal could be applied to the auto's system if the speed were exceeded continuously for more than a certain period. This should pretty much meet the above objectives. Is this what you had in mind ? :-) RM -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.