Pager Application

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
chrisrust
Posts: 4
Joined: Sun May 18, 2003 1:01 am
Location: Minneapolis
Contact:

Pager Application

Post by chrisrust » Sun May 18, 2003 9:01 pm

Has anyone managed to interface appliances with a pager? I would like to use a pager to trigger my remote car starter. The idea is to be able to use my cell phone to call my car pager and have it prompt my remote car starter to start the car. I would purchase a commercial version if one were available but I have not been able to find one. There was a model called the Smart Car Pager but unfortunately it was discontinued. I would think you could find all kinds of uses for a pager. Does anyone have any experience with interfacing with a common pager?

gadgeteer
Posts: 102
Joined: Fri Mar 07, 2003 1:01 am
Location: Ok!
Contact:

Re: Pager Application

Post by gadgeteer » Sun May 18, 2003 9:47 pm

That would seem easy to "fry it" with a direct wired connection. And you would need "inside information" (IE schematic) for the connection...

What kind of pager are we talking about --- maybe one that passes DTMF digits to a speaker? Perhaps a microphone (acoustic-modem-style) driving a DTMF decoder, and a PIC-chip? That way you could still receive real pages, but only a specific phone number would start the car...

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Re: Pager Application

Post by Chris Smith » Sun May 18, 2003 10:08 pm

Tapping into the vibrator motor or beeper in the pager unit is the easy part, opening and solving the can of worms of starting a car is the hard part. <p>Starting cars in the cold, for example, can ruin your starter and battery, if there is no one to gage, watch, or judge the starting process.<p> How long to crank, is it started yet, grinding the starter when the motor is already running, and a whole can of potential worms? And the pager, has no feed back, or second command, should the first fail? <p>Consider the car first, and how to ensure the starting process will be done properly, and then the pager is the easy part. Do you need to pump the gas peddle, or is it fuel injected? How about the Warm up sensor, sometimes called a cranking sensor, that controls the choke like mixture? <p>A simple transistor will carry a load to turn the ignition and starter, but for how long, and how to stop it from cranking when the motor catches, and other things will keep you thinking long into the night. <p>YES, it can be done, with enough logic, but do you really want to? Sounds easy, but even the commercial models don’t tell you the whole story?

chrisrust
Posts: 4
Joined: Sun May 18, 2003 1:01 am
Location: Minneapolis
Contact:

Re: Pager Application

Post by chrisrust » Tue May 20, 2003 9:38 am

What I'm looking for is a way to trigger the remote car starter via the pager as opposed to having the pager start the car. The remote car starter already has all of the logic necessary to perform the task of starting the car. The car starter is already installed on my vehicle and it works great. My idea is to figure out a way of possibly interfacing a pager to a spare remote keychain radio transmitter. To start the car now I simply press the button on my keychain. I was thinking that if I bought a second keychain maybe I could hack into it and add some kind of circuit that would simulate me physically pressing the button. My big question is in trying to figure out how to get a pager to trigger my circuit.

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Re: Pager Application

Post by Chris Smith » Tue May 20, 2003 11:10 am

Tap off the vibrator or buzzer. Any small relay, or transistor, fet, will do?

chessman
Posts: 292
Joined: Tue Jan 14, 2003 1:01 am
Location: Issaquah, WA
Contact:

Re: Pager Application

Post by chessman » Tue May 20, 2003 1:25 pm

I think it'd be pretty easy to have the buzzer or vibrator control a transistor. That transistor would be able to pull the remote start button either high or low....

chrisrust
Posts: 4
Joined: Sun May 18, 2003 1:01 am
Location: Minneapolis
Contact:

Re: Pager Application

Post by chrisrust » Tue May 20, 2003 3:23 pm

I'm curious about how I could build the logic between the pager and my triggering circuit. The remote car starter keychain transmitter has to be held for oh, 5 or maybe 10 seconds. The car then starts. If the button is pressed again, the car shuts off. I would need some way for the pager to send a signal long enough to simulate holding the button for a few seconds.<p>My other fear is in the pager itself. My one and only pager that I've ever used (a Motorola Flex unit) had an annoying feature in which it would continue to beep after it received page until I would push a button to acknowledge. It was nothing more an alarm to let you know you had a message waiting. That feature would definitely not work with this application. <p>What would be really neat is for some way to distinguish between what you wanted to do with the page. Something like pressing 5 to start the car. If one got really elaborate maybe you could also control the power door looks.

bodgy
Posts: 1044
Joined: Tue Dec 04, 2001 1:01 am
Location: Australia
Contact:

Re: Pager Application

Post by bodgy » Tue May 20, 2003 3:49 pm

A pulse stretching circuit at the car end (ignition interface) would be what you need.<p>Colin
On a clear disk you can seek forever.

User avatar
frhrwa
Posts: 897
Joined: Mon Feb 04, 2002 1:01 am
Location: Eastern Washington (state) and N. Las Vegas (winter)
Contact:

Re: Pager Application

Post by frhrwa » Wed May 21, 2003 7:55 am

just about any auto toy store should have the remote start/door open/alarm system.. I had one installed on my 90 GMC 4X4.. I could hit the button and it would start up and run for up to 5 minutes... it was adjustable as to how long it turned the starter, monitored the oil pressure too.. locked or unlocked my doors, turned on/off the alarm system.. and really anything you wanted to hook up to it.. cost me about $55 around 5 years ago.. worked great .. truck was warmed up by the time I came wondering out.. and if I forgot and started another project, it shut off after "your" programmed amount of time..
JESUS”…… don’t leave EARTH without HIM!

User avatar
Externet
Posts: 1838
Joined: Fri Feb 01, 2002 1:01 am
Location: Mideast USA
Contact:

Re: Pager Application

Post by Externet » Wed May 21, 2003 9:11 am

Applications for a pager... here is a proposal:<p>A permanent always-on installation of a pager in an automobile, supplied by a separate hidden kept-recharged cell.<p>Upon reception, to trigger a valve to release a huge orange cloud of smoke and blow running fuses and horn.<p>If your car is stolen, it will be very noticed as soon as you dial the pager.<p>Just keep fingers crossed you won't get a wrong number while you travel on a freeway. (or disable it with a hidden switch) <p>Miguel :D
- Abolish the deciBel ! -

chrisrust
Posts: 4
Joined: Sun May 18, 2003 1:01 am
Location: Minneapolis
Contact:

Re: Pager Application

Post by chrisrust » Wed May 21, 2003 4:02 pm

Yeah, that's great guys. I'm just looking for a way to start my car using my cell phone. I thought a pager might be the way to go for price and simplicity. Since I already have the remote car starter I thought an interface between a pager and the transmitter for the remote car starter would be the way to go. The reason I'm interested in using the cell phone is because my car sits in a company parking lot about 2 miles away. It sure would be nice to have the car warm by the time the shuttle bus arrived in the lot.

Will
Posts: 310
Joined: Tue Feb 11, 2003 1:01 am
Location: Katy Texas
Contact:

Re: Pager Application

Post by Will » Wed May 21, 2003 6:15 pm

I don't now how to do this in detail - however - What you need to dois to investigate the innards of your pager. As you and others have said, if you just hang on to the buzzer/tweeter/vibrator circuit of the pager theb any wrong number will start your car. There are two ways you can get out of this i.e. 1) Arrange the electronics so that you have to call your car twice i.e. the first time you call you will set it up so that it needs another call within, say, one or two minutes to start it OR 2) You investigate the guts of your pager and set up a circuit so that you can read and identify the phone number you leave on your pager and only act on it. You might even be able to improve upon this by ;eaving an impractical/impossible call back number on your pager e.g onr witj a letter in it or 8, followed by (say) nine 2's and ending in a 9. Have fun
BB

ljbeng
Posts: 99
Joined: Mon Jan 13, 2003 1:01 am
Location: South Central NE
Contact:

Re: Pager Application

Post by ljbeng » Wed May 28, 2003 9:41 am

I make remote monitor and control systems that use a digital cellular phone and I can turn relays on or off and monitor temperature, pressure, etc.<p>The digital phone is connected to my pc board at the monitoring station and gives you voice feedback. It is somewhat custom made to the customer's needs. The voice messages are always specific to the application and the monitored inputs vary. It is cabable of reading most any digital pulse or analog input and I can switch a limited number of relays or other outputs.<p>LJB Engineering<p>None of my custom products are shown on the website.

desterline
Posts: 86
Joined: Mon Jun 09, 2003 1:01 am
Contact:

Re: Pager Application

Post by desterline » Tue Jun 10, 2003 7:33 am

I think were starting to lead Chris' thread astray, but here's my two cents.<p>A couple years ago I remember reading an article where they were using the pager network to send data to remotly located electronic signs at a ski resort (I think in Switzerland).<p>Denny

Bernius1
Posts: 349
Joined: Sat Sep 21, 2002 1:01 am
Location: NY
Contact:

Re: Pager Application

Post by Bernius1 » Tue Jun 10, 2003 11:36 am

I HAVE A LEAD FOR YOU ALL. HTTP://WWW.HAINESENTERPRISES.COM
URL=HTTP://WWW.HAINESENTERPRISES.COM][email protected][/URL]<p>MOSTLY AUTO PHONE & STEREO INSTALL STUFF. REQUEST A PRICED CATALOG ONLINE, OR CALL 631-348-1750. $18.00 FOR 1,000 BLUE BUTT CONNECTORS, 69.00 FOR 1,000 14"x1/4" NYL TIES. BUT THE AUTO-STARTERS & ALARMS PERTAIN TO THIS POST. HARNESS ADAPTORS, TRUNK MATTING, MATCHING X-FORMER W/RCA's, CABLE. I'M NET 30 WITH THEM.
Can't we end all posts with a comical quip?

Post Reply

Who is online

Users browsing this forum: No registered users and 16 guests