Bluetooth gadget

Hi gadgeteers :)

I know what I want and I know how I want it to work.
I have seen on here and other sites circuits and projects that almost do what I want, but the they are too complex.

Basically I want a keyless vehicle ignition using bluetooth.

What it needs to do:
When my mobile moves into range it will turn on (and stay on).
When my mobile moves out of range it will turn off.

It needs to run from vehicle power or recharge itself from it.
It specifically does not require an app on the subject device.

I normally keep my bluetooth turned off, so it would actually be when it is turned on or off.

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take a look at this.
or perhaps research the toyota key for the prius. it within a certain range will tell the car the operator can push the start button
use rfid. put reader on center console. and keep tag in your right pocket. have an arduino power a relay for ignition
So you want a bluetooth receiver in the car and when it connects to your specific device it needs to automatically turn the ignition on. So you'll need a small computer like a Rasberry Pi built into the car running off the battery and programmed to sync with your phones bluetooth.

You'll need the Pi to activate relays that bypass the ignition and turn the power on to the car then another relay to activate for a determined amount of time to turn the car over. All of this would make your car extremely easy to steal. Bluetooth isn't a secure means of transmission and is easily hacked. Just about any phone that finds the open port from your car could sync with it and activate your system.

Other considerations would be the amount of power being drawn from the system as it's waiting to get a signal. So you'll need to know how much power the total system draws so you don't kill your car battery.
iphillips3 (author)  mpilchfamily4 years ago
Far too complex and power hungry :)
Not a car, bike.
Only needs to turn switched live on so only one relay.
Doesn't need anything on the bike to say that it is 'live', I can tell that that from the phone since it is paired.
A search for 'bluetooth relay' finds several boards that almost do the job, but they all seem to turn off again after 5 minutes max, would prefer not to have to mess around with extra logic to keep the ignition on.
If it can't handle enuff current that isn't a problem, I'll just use an external 30A relay.
Ability to have reduced range with be a bonus, 50cm would be ideal.

PS: I'll be using a raspberry pi as engine management/media server/satnav on the trike :)
Then look into using RFID. It won't be on you phone unless you attach an RFID tag to it.
iphillips3 (author)  mpilchfamily4 years ago
That is an option, however from what I understand the range is only an inch or 2 and I would have to specifically swipe the tag.
I am specifically looking for an option that activates when I move into range, I don't want to take any action that an observer could identify as turning the ignition on.
After further thought, the ideal range would be 1-2m.
If an RFID unit could be setup with that range and set so that it keeps the relay active as long as the tag is in range, then yes, that would be a better option.
Read up on RFID. There are more options then what you think. RFID has both active and passive tags. It all depends on the frequency range in use. There are both active and passive options for 1 to 2 meters in range. There are even options that go up to 200 meters. These tags are often using for tracking shipping containers through ports.
iphillips3 (author)  mpilchfamily4 years ago
Ok, so where would I get a system with a 1m range?
The 125Khz ones could be arranged to do that, its all down the antenna design and orientation. Lots of experiment required.
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