Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Need Help With A Small Project...

Status
Not open for further replies.

rs14smith

Member
Hi everyone,

Project Idea:
When I'm driving in my car and someone is on my tail, I want to be able to press a button that will wirelessly send a signal to a portable LCD (placed inside my car, in the corner of my back car window) that will display a message of my choosing (something I programmed it to say).

------------------------------
What I Need Help With:
I currently already have a Parallax board which I can easily use to program different messages into the LCD.

Where I need help is, creating the transmitter portion of the project. That is, figuring out what components are needed to create a button that when pressed, it will send a digital wireless HI/LO signal to a pin on my Parallax board. Once I figure that out, I know how to do the rest.

Thanks! :)
 

carbonzit

Active Member
What I Need Help With:
I currently already have a Parallax board which I can easily use to program different messages into the LCD.

Where I need help is, creating the transmitter portion of the project. That is, figuring out what components are needed to create a button that when pressed, it will send a digital wireless HI/LO signal to a pin on my Parallax board. Once I figure that out, I know how to do the rest.

Sorry, I can't help here, but I'm curious: it sounds like what you need is sort of the degenerate case (mathematically speaking) of a Bluetooth (or other wireless) link, one that simply sends a signal: "I'm here!". So are there any quick-easy off-the-shelf solutions for this? Like maybe a single chip at each end, one transmitter, one receiver?

Project Idea:
When I'm driving in my car and someone is on my tail, I want to be able to press a button that will wirelessly send a signal to a portable LCD (placed inside my car, in the corner of my back car window) that will display a message of my choosing (something I programmed it to say).

Let me guess: "IF YOU CAN READ THIS, YOU'RE TOO DAMN CLOSE"?
 
Last edited:

rs14smith

Member
So are there any quick-easy off-the-shelf solutions for this? Like maybe a single chip at each end, one transmitter, one receiver?

I'm hoping there is, as that will make life a lot easier than having to build one. However, building one should not be too difficult either I would think.

Let me guess: "IF YOU CAN READ THIS, YOU'RE TOO DAMN CLOSE"?

lol something like that!
 

Jaguarjoe

Member
Add an ultrasonic distance measuring device to your back bumper. Have it and vehicle speed automatically change messages on your LCD. The LCD can start out with polite comments from far away or at slow speed and progressively become more rude as the danger gets closer or faster. If you had a graphical LCD you could even flip 'em the bird but you might want to be sure your car is fast enough for a quick getaway first :)
 

unclejed613

Well-Known Member
Most Helpful Member
only one problem i see with this..... the driver behind you wants to see what it says next, and so keeps getting closer and closer until BAM! they get too close...
 

carbonzit

Active Member
Hey, I think I found something that'll work for you. Check out Micrel's QwikRadio line of ASK/OOK transmitters/receivers. (Yes, I didn't know what that meant either until a few minutes ago: amplitude shift keyed/on-off-keyed.) They're single-chip transmitters and receivers, less than $5 a chip.
 

rs14smith

Member
Hey, I think I found something that'll work for you. Check out Micrel's QwikRadio line of ASK/OOK transmitters/receivers. (Yes, I didn't know what that meant either until a few minutes ago: amplitude shift keyed/on-off-keyed.) They're single-chip transmitters and receivers, less than $5 a chip.

Cool, I'll check it out.
 

rs14smith

Member
@carbonzit, if you were going about this project, which transmitter/receiver(model#) would you buy? I see they have several, and I see that most use a range from 0-300ft which is great (more than I need).
 

carbonzit

Active Member
@carbonzit, if you were going about this project, which transmitter/receiver(model#) would you buy? I see they have several, and I see that most use a range from 0-300ft which is great (more than I need).

Sorry; as they say, that's a bit above my pay grade.

I'm hoping someone else here has had some experience with these modules, or ones like them. I haven't had a chance to look at all of them (I think there are only about half a dozen or so of each). Also not sure about how exactly to interface them at each end, but it looks like it should be fairly simple.
 

audioguru

Well-Known Member
Most Helpful Member
I somebody is driving on my tail too close then I gently press the brake and floor the gas. He sees my brake lights and thinks I am stopping and tries to get out of my path. Last week a full size van was on my tail and when I pressed my brake he nearly rolled his van. I think his tires are flat spotted now.
 

Mickster

Well-Known Member
Most Helpful Member
If someone is too close on my tail, I'll let them get past at the earliest opportunity and bother someone else.
If they cause an accident with someone else, you can bet your donkey I'd be a witness for them!
 

Reloadron

Well-Known Member
Most Helpful Member
What I don't get is you will need a means to disable or something at traffic lights.

Just a thought......
Ron
 

shokjok

Member
I considered the same thing, with the message changing each time the brake switch was depressed. Mine used an LED array spelling out WHOA!, BACK OFF!, YIKES!!!, and some other specific chosen words. Mine isn't wireless, the distance being short enough to not get interference from outside sources. Legal issues aside, my project never saw the light of day.
 

Jaguarjoe

Member
@carbonzit, if you were going about this project, which transmitter/receiver(model#) would you buy? I see they have several, and I see that most use a range from 0-300ft which is great (more than I need).

A lot of guys have good success with this stuff:

Professional RF IC&module, RF Components and Digital Sensor designers and manufacturers - HOPE Microelectronics

I doubt if these things are very expensive. For a lot of info, go over to the Picaxe forum and find a guy called "manuka". He spent a lot of time evaluating these kind of modules and the last I heard, he liked the Hope RF stuff the best. His real name is Stan Swan, he's a Kiwi and publishes a lot of stuff down under.
eBay also has a lot of these modules, some incredibly cheap in price and quality.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Top