in my old car, i had another simpler solution-- i put a switch to unlock the doors under the front end.
i didn't use a waterproof switch, and never locked my keys in that car, so i kind of forgot about it until the switch corroded, and my doors kept trying to open one day..
The printer will be charged by the car when it is running but when it is off it will run off the internal battery.
Security is not an issue because not body walks around parking lots with Bluetooth hacking software trying to connect to a Bluetooth printer. The car also requires a key with a computer chip to start.
If my phone was also locked in with my keys I could get a friend to lend me their phone.
I really don't see any problems OldSpark
That's almost a cut&paste from your PM reply...
So I didn't convince you in my PMs.
As to not finding an unsecured wireless channel, maybe the people I know or hear of don't drive or walk past your neighborhood.
But if you have insurance and it covers an unsecured vehicle it's not a big concern.
Incidentally, my page-1 "security" comment referred to to PIC-code security as opposed to uPC (Audrino etc) code access.
I'm glad to see that the inverter was irrelevant. Phew!
So, another 24x7 printer. I'm glad it isn't the older full time thermals!
Let me know when you replace the printer battery and what type it is (or costs) - I'm interested in the maintenance costs of this system.
Let me know too if the printer battery fails before you need it.
Depending on the make and model, opening the door usually happens via a message on the vehicle bus. For more recent cars, CAN, for earlier ones J1850. You can use an ELM327 device and monitor the bus to find the precise message (typically unlocking one door will cause its controller to send the message to the other doors). Sometimes there is no relay or solenoid except in the door itself, but if so then a reed switch or something far simpler would work.
There are bluetooth versions of "OBD-II" devices for less than the printer, but they tend to pair with anything, so anyone that scanned it might be able to open the doors.
A wifi router might be cheaper and more secure since you can use a stong password (one of the DD-WRT project APs). Then either go serial to OBD or find a LED you can light up and run it via transistor to the relay.
I don't think swinso still sees any problem with his method and intent though....
I did try though.... (via PM).
do a good job,thank you!
So it uses a spare keyfob... Great, but what if *it* has a dead battery...
"The car also requires a key with a computer chip to start."
Which might be exactly what they have if you did not notice you left your keys in the car when you leave it on the local mall carpark...
"If my phone was also locked in with my keys I could get a friend to lend me their phone."
So you intend to keep the printer in "findable" mode? That way people do not even need special hacking software... Once they're in reach of the printer, it will show up as a new device! And most hardware TELLS you what brand and model it is, so guessing/finding the PIN would be trivial...
If you do NOT intend to keep it findable, how would you pair a friend's phone with it?...
Just a few practical questions I have... ;)
Been there. Tried that.
But swinso sees no problem....
FYI - Wendy is another topchinabuy.com spamster that joined today just so she could add her comment.
I don't know why she bothered - we have already blacklisted topchinabuy.com...
PS - I only just realised what theme this thread was posted under. I thought it was a serious project!